Agilent 81642B Users Guide

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Agilent 81480B, 81680B, 81640B and

Agilent 81672B, 81482B, 81682B, & 81642B Tunable

Laser Modules

User’s Guide

Notices

This document contains proprietary information that is protected by copyright. All rights are reserved.

No part of this doc ument may be repr oduced in any fo rm or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Agilent Technologies Deutschland GmbH as governed by United States and international copyright laws.

Copyrig ht 2002 by:

Agilent Technologies Deutschland GmbH Herrenberger Str. 130 71034 Böblingen Germany

Subject Matter

The material in this document is subject to change without notice.

Agilent Technologies makes n o warran ty of any kin d

with regard to this printed material, including, but not limited to, the impl ied warranties of merch antability and fitness for a particular purpose.

Agilent Technologies shall not be liable for errors contained herein or for incidental or consequential dama ges in conn ecti on wit h the furn ishing, performance , or use of this material.

Printing History

New editio ns are complete revisions of the guide reflecting alterations in the functionality of the instrument. Updates are occasionally made to the guide between editions. The date on the title page change s when an updated guide is published. To find out the current revision of the guide, or to purchase an updated guide, contact your Agilent Technologies representative.

Control Serial Number: First Edition applies directly to all instruments.

Exclusive Remedies

The remed ies provided herein are Buyer’s sole and exclusive remedies. Agilent Technologies shall not be liable fo r any direct, i ndirect, special, incidental, or consequential damages whether based on contract, tort, or any other legal theory.

Assistance

Product maintenance agreements an d other custome r assistan ce agreements are availab le for Agilent Technologies products. For any assistance contact your nearest Agilent Technologies Sales and Service Office.

Certification

Agilent Technologies Inc. certifies that this product met its published specifications at the time of shipment from the factory.

Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Stand ards and Technology, NIST (formerly the United St ates National Bureau of Standards, NBS) to the extent allowed by the Institutes’s calibration facility, and to the calibration facilities of other International Standards Organization members.

ISO 9001 Certification

Produced to ISO 9001 international quality syste m standard as part of our objective of continually increasing customer satisfa ction th rough improved process co ntrol.

Second edition:

81680-90B12 April 2002

First edition: 81680-90B11 February 2002

Warranty

This Agilent Technolog ies instrument pro duct is warranted against defects in ma terial and workmanship for a pe riod of one year from dat e of ship ment. Du ring the warranty period, Agilent will, at its optio n, either repair or replace products that prove to be defective.

For warranty service or repair, this product must be returned to a service facility designated by Agilent. Buyer shall prepay shipping charges to Agilent and Agilent shall pay shipping charges to return the product to Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products returned to Agilent from another country.

Agilent warrants that its software and firmware designated by Agilent for use with an instrument will execute its programming instructions when properly installed on that instrument. Agilent does not warrant that the operation of the instrument, software, or firmware will be uninterrupted or error free.

Limitation of Warranty

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer, Buyer-supplied software or interfacing, unauthorize d modification or misuse , operation out side of the environmental specifications for the product, or improper site preparation or maintenance.

No other warranty is expressed or implied. Agilent Technologies specifically disclaims the implied warranties of Merchantability and Fitness for a Particular Purpose.

2 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Safety Considerations

The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Agilent Technologies Inc. assumes no liability for the customer’s failure to comply with these requirements.

Before operation, review the instrument and manual, including the red safety page, for safety markings and instructions. You must follow these to ensure safe operation and to maintain the instrument in safe condition.

WARNING The WARNING sign denotes a hazard. It calls attention to a procedure,

practice or the like, which, if not correctly performed or adhered to, could result in injury or loss of life. Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met.

Safety Symbols

The apparatus will be marked with this symbol when it is necessary for the user to refer to the instruction manual in order to protect the apparatus against damage.

Hazardous laser radiation.

Initial Inspection

Inspect the shipping container for damage. If there is damage to the container or cushioning, keep them until you have checked the contents of the shipment for completeness and verified the instrument both mechanically and electrically.

The Performance Tests give procedures for checking the operation of the instrument. If the contents are incomplete, mechanical damage or defect is apparent, or if an instrument does not pass the operator’s checks, notify the nearest Agilent Technologies Sales/Service Office.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 3

Safety Considerations

WARNING To avoid hazardous electrical shock, do not perform electrical tests

WARNING You MUST return instruments with malfunctioning laser modules to

when there are signs of shipping damage to any portion of the outer enclosure (covers, panels, etc.).

an Agilent Technologies Sales/Service Center for repair and calibration.

Line Power Requirements

The Agilent 81480B, Agilent 81482B, Agilent 81680B, Agilent 81640B, Agilent 81682B, Agilent 81672, & Agilent 81642B Tunable Laser Modules operate when installed in the Agilent 8164A/B Lightwave Measurement System.

Operating Environment

The safety information in the Agilent 8163A/B Lightwave Multimeter, Agilent 8164A/B Lightwave Measurement System, & Agilent 8166A/B Lightwave Multichannel System User’s Guide summarizes the operating ranges for the Agilent 81480B, Agilent 81482B, Agilent 81680B, Agilent 81640B, Agilent 81682BA, Agilent 81672B, & Agilent 81642B Tunable Laser Modules. In order for these modules to meet specifications, the operating environment must be within the limits specified for your mainframe.

Input/Output Signals

CAUTION There are two BNC connectors on the front panel of the

Agilent 81480B, Agilent 81482B, Agilent 81680B, Agilent 81640B, Agilent 81682B, Agilent 81672B, and Agilent 81642B; a BNC input connector and a BNC output connector.

An absolute maximum of ±6 V can be applied as an external voltage to any BNC connector.

Storage and Shipment

This module can be stored or shipped at temperatures between

−40°C and +70°C. Protect the module from temperature extremes that may cause condensation within it.

4 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Safety Considerations

Initial Safety Information for Tunable Laser Modules

The laser sources specified by this user guide are classified according to IEC 60825-1 (2001).

The laser sources comply with 21 CFR 1040.10 except for deviations pursuant to Laser Notice No. 50 dated 2001-July-26.:

Agilent 81480B Agilent 81482B Agilent 81680B Agilent 81682B Agilent 81640B Agilent 81642B Agilent 81672B

Laser Type FP-Laser

InGaAsP

Wavelength range 1370-1495 nm 1370-1495 nm 1460-1580 nm 1460-1580 nm 1495-1640 nm 1495-1640 nm 1260-1375 nm

Max. CW output power* <15 mW <15 mW <15 mW <15 mW <15 mW <15 mW <15 mW

Beam waist diameter 9 µm9 µm9 µm9 µm9 µm9 µm9 µm

Numerical aperture 0.10.10.10.10.10.10.1

Laser Class according to IEC 60825-1 (2001)- Intl.

Max. permissible CW output power

* Max. CW output power is defined as the highest possible optical power that the laser source can produce at its output connector.

1M 1M 1M 1M 1M 1M 1M

52 mW/ 163 mW

FP-Laser InGaAsP

52 mW/ 163 mW

FP-Laser InGaAsP

163 mW 163 mW 163 mW 163 mW 52 mW

FP-Laser InGaAsP

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 5

Safety Considerations

Laser Safety Labels

Laser class 1M label

Figure 1 Class 1M Safety Label - Agilent 81480B/82B/ 81640B/42B/80B/82B/72B

Figure 2 FDA Certification Label

A sheet of laser safety labels is included with the laser module as required. In order to meet the requirements of IEC 60825-1 we recommend that you stick the laser safety labels, in your language, onto a suitable location on the outside of the instrument where they are clearly visible to anyone using the instrument

WARNING Please pay attention to the following laser safety warnings:

• Under no circumstances look into the end of an optical cable attached to the optical output when the device is operational. The laser radiation can seriously damage your eyesight.

6 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Safety Considerations

• Do not enable the laser when there is n0 fiber attached to the optical output connector.

• The laser is enabled by pressing the gray button close to the optical output connector on the front panel of the module. The laser is on when the green LED on the front panel of the instrument is lit.

• The use of the instruments with this product will increase the hazard to your eyes.

• The laser module has built-in safety circuitry which will disable the optical output in the case of a fault condition.

Refer servicing only to qualified and authorized personnel.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 7

Safety Considerations The Structure of this Manual

The Structure of this Manual

This manual is divided into two categories:

•Getting Started This section gives an introduction to the Tunable Laser modules. and aims to make these modules familiar to you:

– “Overview of Tunable Laser Sources” on page 19.

• Additional Information This is supporting information of a non-operational nature. this contains information concerning accessories, specifications, and performance tests:

– “Accessories” on page 27,

– “Specifications” on page 35, and

– “Performance Tests” on page 69.

Conventions used in this manual

• Hardkeys are indicated by italics, for example, Config, or Channel.

• Softkeys are indicated by normal text enclosed in square brackets, for example, [Zoom] or [Cancel].

• Parameters are indicated by italics enclosed by square brackets, for example, [Range Mode], or [MinMax Mode].

• Menu items are indicated by italics enclosed in brackets, for example, <MinMax>, or <Continuous>.

8 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Tab l e of C ont e nts

Safety Considerations 3

Tab l e o f C o nte n ts

Safety Symbols 3 Initial Inspection 3 Line Power Requirements 4 Operating Environment 4 Input/Output Signals 4 Storage and Shipment 4 Initial Safety Information for Tunable Laser Modules 5 Laser Safety Labels 6

The Structure of this Manual 8

Conventions used in this manual 8

Overview of Tunable Laser Sources 19

What is a Tunable Laser? 21

Output Types 21

Agilent 81480B/82B, 81680B/72B/82B/40B/42B Tunable Laser Modules 22

Optical Output 24

Polarization Maintaining Fiber 24 Angled and Straight Contact Connectors 24

Signal Input and Output 25

Accessories 27

Modules and Options 29 Modules 30

User’s Guides 31 Options 31

Option 003 - Agilent 81482B, Agilent 81682B, Agilent 81642B 31 Option 071 - All Tunable Laser Modules 31 Option 072 - All Tunable Laser Modules 31

Connector Interfaces and Other Accessories 32

Option 071: Straight Contact Connector 32 Option 072: Angled Contact Connector 33

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 9

Table of Content s

Specifications 35

Definition of Terms 37

Static Conditions 37

Absolute Wavelength Accuracy 37 Effective Linewidth 37

Linewidth 38 Minimum Output Power 38 Mode-Hop Free Tuning Range 38

Modulation Depth 39 Modulation Extinction Ratio 39 Modulation Frequency Range 39

Output Power 39 Output Isolation 39 Peak Power 39

Polarization Extinction Ratio 40 Power Flatness Over Modulation 40 Power Flatness Versus Wavelength 40

Power Linearity 40 Power Repeatability 41 Power Stability 41

Relative Intensity Noise (RIN) 41 Relative Wavelength Accuracy 41 Return Loss 42

Sidemode Suppression Ratio 42 Signal-to-Source Spontaneous Emission (SSE) Ratio 42 Signal-to-Total-Source Spontaneous Emission 43

Wavelength Range 43 Wavelength Repeatability 43 Wavelength Resolution 44

Wavelength Stability 44

Dynamic Conditions 45

Add-on Specification Under Dynamic Conditions 45 Logged Wavelength 45 Wavelength Accuracy 45

Dynamic wavelength repeatability 46 Dynamic power flatness 47 Dynamic relative power flatness 47

Dynamic power reproducibility 47

Tunable Laser Module Specifications 49

10 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Tab l e o f C o nte n ts

Supplementary Performance Characteristics

Operating Modes 65

Internal Digital Modulation 1 65 External Digital Modulation 1 65

External Analog Modulation 1 65 External Wavelength Locking 65 Coherence Control 65

Continuous Sweep 65 Stepped Mode 66

General 66

Output Isolation (typ.): 66 Return loss (typ.): 67

Polarization Maintaining Fiber (Options 071, 072): 67 Laser Class: 67 Recalibration Period: 67

Warm-up Time: 67

Environmental 67

Storage Temperature: 67 Operating Temperature: 67 Humidity: 67

Performance Tests 69

Required Test Equipment 71

Test Record 72 Test Failure 72 Instrument Specification 72

Performance Test Instructions 74

General Test Setup 74 Wavelength Tests 74

General Settings of Wavelength Meters for all Wavelength Tests 75

Wavelength Accuracy 75

Relative Wavelength Accuracy 75 Absolute Wavelength Accuracy 77

Mode Hop Free Tuning 77

Wavelength Repeatability 78 Power Tests 80

Maximum Output Power 80

Power Linearity 82

Power Linearity - Low Power Test 82

Example (Agilent 81680B Output 1) 84 Power Linearity - High Power Test 84

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 11

Table of Content s

Power Linearity - Test Using Attenuation 86

Power Flatness over Wavelength 87

Power Flatness over Wavelength - Without Attenuation 87

Power Flatness over Wavelength - Using Attenuation 89

Power Stability 91 Signal-to-Source Spontaneous Emission 93

Signal-to-Source Spontaneous Emission Tests

- High Power Outputs 93

Signal-to-Source Spontaneous Emission Tests

- Low SSE Outputs 95

Signal-to-Total-Source Spontaneous Emission 101

Signal to Total SSE Tests - Low SSE Outputs 101

Optional Tests 108

Signal to Total SSE Tests - High Power Outputs 108 Dynamic Wavelength Accuracy 111

Introduction 111

Required Equipment 111 Test Overview 111 Test Setup and Measurement Procedure 112

Measurement Sequence 113 Reference Scans 114 Verification Measurements (Continuous Sweeps) 116

Dynamic Absolute and Relative Wavelength Uncertainty 118

Analysis 118

Dynamic Wavelength Repeatability 119

Analysis 119

Normalized Sweep Acceleration 120

Te st R ec or d 121

Agilent 81480B Performance Test 121 Test Equipment Used 122

Relative Wavelength Accuracy 123 Mode Hop Free Tuning 125

Wavelength Repeatability 126 Maximum Power Test 127 Power Linearity Output 1, Low SSE 128

Power Linearity Output 2, High Power Upper Power Levels 128 Power Linearity Output 2, High Power by attenuator 129 Power Flatness 130

Power Stability 131 Signal-to-Source Spontaneous Emission

- 81480B Output 2, High Power 131 Signal-to-Source Spontaneous Emission

- 81480B Output 1, Low SSE 132

12 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Tab l e o f C o nte n ts

Signal-to-Total-Source Spontaneous Emission

- 81480B Output 1, Low SSE 133

Optional Test: Signal-to-Total-Source Spontaneous Emission

- 81480B Output 2, High Power 133 Optional Tests:

Dynamic Wavelength Accuracy and Repeatability 134

Agilent 81680B Performance Test 135 Test Equipment Used 136

Relative Wavelength Accuracy 137 Mode Hop Free Tuning 139 Wavelength Repeatability 140

Maximum Power Test 141 Power Linearity Output 1, Low SSE 142 Power Linearity Output 2, High Power Upper Power Levels 142

Power Linearity Output 2, High Power by attenuator 143 Power Flatness 144 Power Stability 145

Signal-to-Source Spontaneous Emission

- 81680B Output 2, High Power 145 Signal-to-Source Spontaneous Emission

- 81680B Output 1, Low SSE 146 Signal-to-Total-Source Spontaneous Emission

- 81680B Output 1, Low SSE 147

Optional Test: Signal-to-Total-Source Spontaneous Emission

- 81680B Output 2, High Power 147 Optional Tests:

Dynamic Wavelength Accuracy and Repeatability 148

Agilent 81640B Performance Test 149 Test Equipment Used 150

Relative Wavelength Accuracy 151 Mode Hop Free Tuning 153 Wavelength Repeatability 154

Maximum Power Test 155 Power Linearity, Output 1, Low SSE 156 Power Linearity Output 2, High Power Upper Power Levels 156

Power Linearity Output 2, High Power by Attenuator 157 Power Flatness 158 Power Stability 159

Signal-to-Source Spontaneous Emission

- 81640B Output 2, High Power 159 Signal-to-Source Spontaneous Emission

- 81640B Output 1, Low SSE 160 Signal-to-Total-Source Spontaneous Emission

- 81640B Output 1, Low SSE 161

Optional Test - Signal-to-Total-Source Spontaneous Emission

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 13

Table of Content s

- 81640B Output 2, High Power 161

Optional Tests: Dynamic Wavelength Accuracy and Repeatability 162

Agilent 81482B Performance Test 163 Test Equipment Used 164

Relative Wavelength Accuracy 165

Mode Hop Free Tuning 167 Wavelength Repeatability 168 Maximum Power Test 169

Power Linearity - 81482B 170 Power Linearity 81482B #003 Upper Power Levels 171 Power Linearity 81482B #003 by Attenuator 172

Power Flatness 173 Power Stability 173 Signal-to-Source Spontaneous Emission - 81482B 174

Optional Test: Signal-to-Total-Source Spontaneous Emission

- 81482B 174 Otional Tests:

Dynamic Wavelength Accuracy and Repeatability 175

Agilent 81672B Performance Test 177 Test Equipment Used 178

Relative Wavelength Accuracy 179 Mode Hop Free Tuning 181 Wavelength Repeatability 182

Maximum Power Test 183 Power Linearity - 81672B 183 Power Flatness 184

Power Stability 185 Signal-to-Source Spontaneous Emission- 81672B 185 Optional Test: Signal-to-Total-Source Spontaneous Emission

- 81672B 186

Optional Tests: Dynamic Wavelength Accuracy and Repeatability 187

Agilent 81682B Performance Test 189 Test Equipment Used 190

Relative Wavelength Accuracy 191

Mode Hop Free Tuning 193 Wavelength Repeatability 194 Maximum Power Test 195

Power Linearity - 81682B 195 Power Linearity 81682B #003 Upper Power Levels 196 Power Linearity 81682B #003 by Attenuator 197

Power Flatness 198 Power Stability 199

14 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Tab l e o f C o nte n ts

Signal-to-Source Spontaneous Emission - 81682B 199

Optional Test: Signal-to-Total-Source Spontaneous Emission

- 81682B 200 Optional Tests:

Dynamic Wavelength Accuracy and Repeatability 201

Agilent 81642B Performance Test 203 Test Equipment Used 204

Relative Wavelength Accuracy 205 Mode Hop Free Tuning 207 Wavelength Repeatability 208

Maximum Power Test 209 Power Linearity - 81642B 209 Power Linearity 81642B #003 Upper Power Levels 210

Power Linearity 81642B #003 by Attenuator 211 Power Flatness 212 Power Stability 213

Signal-to-Source Spontaneous Emission - 81642B 213 Optional Test: Signal-to-Total-Source Spontaneous Emission

- 81642B 214 Optional tests:

Dynamic Wavelength Accuracy and Repeatability 215

Cleaning Information 217

Safety Precautions 219 Why is it important to clean optical devices? 219 What do I need for proper cleaning? 220

Standard Cleaning Equipment 220

Dust and shutter caps 220

Isopropyl alcohol 221 Cotton swabs 221 Soft tissues 222

Pipe cleaner 222 Compressed air 222

Additional Cleaning Equipment 223

Microscope with a magnification range about 50X up to 300X 223 Ultrasonic bath 223

Warm water and liquid soap 224 Premoistened cleaning wipes 224 Polymer film 224

Infrared Sensor Card 224

Preserving Connectors 225 Cleaning Instrument Housings 225

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 15

Table of Content s

Which Cleaning Procedure should I use ? 226 How to clean connectors 226 How to clean connector adapters 227 How to clean connector interfaces 228 How to clean bare fiber adapters 229 How to clean lenses 230 How to clean instruments with a fixed connector interface

230

How to clean instruments with an optical glass plate 231 How to clean instruments with a physical contact interface

231

How to clean instruments with a recessed lens interface

232

How to clean optical devices which are sensitive to mechanical stress and pressure

233

How to clean metal filters or attenuator gratings 234 Additional Cleaning Information 235

How to clean bare fiber ends 235 How to clean large area lenses and mirrors 235

Other Cleaning Hints 237

16 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

List of Figures

Figure 1 Class 1M Safety Label

- Agilent 81480B/82B/ 81640B/42B/80B/82B/72B . . . . 6

Figure 2 FDA Certification Label . . . . . . . . . . . 6

Figure 3 Agilent 81480B Tunable Laser Module (straight contact connectors) 22 Figure 4 Agilent 81680B Tunable Laser Module (straight contact connectors) 22 Figure 5 Agilent 81482B Tunable Laser Module (straight contact connector) 22 Figure 6 Agilent 81682B Tunable Laser Module (straight contact connector) 22 Figure 7 Agilent 81640B Tunable Laser Module (straight contact connectors) 22 Figure 8 Agilent 81672B Tunable Laser Module (straight contact connectors) 23 Figure 9 Agilent 81642B Tunable Laser Module (straight contact connectors) 23

Figure 10 PMF Output Connector . . . . . . . . . . . 24

Figure 11 Angled and Straight Contact Connector Symbols . . . . . 25

Figure 12 Agilent 81682B Tunable Laser Module (angled contact connector) 25 Figure 13 Agilent 8164A/B mainframes, Tunable Laser Modules, and Options 29

Figure 14 Option 071: PMF with Straight Contact Connectors . . . . 32

Figure 15 Option 072: PMF with Angled Contact Connector . . . . . 33

Figure 16 Test Setup for Wavelength Tests . . . . . . . . . 74

Figure 17 Test Setup for the Maximum Output Power Tests . . . . . 80

Figure 18 Test Setup for Low Power Linearity Tests . . . . . . . 86

Figure 19 Test Setup for the Source Spontaneous Emission Test

- High Power Outputs . . . . . . . . . . . . 93

Figure 20 Transmission Characteristic of Fiber Bragg Grating . . . . 96

Figure 21 Signal-to-Spectral SSE Measurement. . . . . . . . 96

Figure 22 Test Setup for Source Spontaneous Emission Test . . . . 97

Figure 23 Test Flow - Dynamic Wavelength Accuracy Measurements . . 112 Figure 24 Setup for wavelength uncertainty verification in swept mode . . 113 Figure 25 Optimization of reference scans.

Sampling points as circled, threshold in dashed line. . . . . 116

Figure 26 Measurement Setup to Determine the Sweep Speed . . . . 120

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 17

List of Figures

18 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Overview of Tunable Laser Sources

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 19

Overview of Tunable Laser Sources

This chapter describes the Agilent 81480B, Agilent 81680B, Agilent 81640B, Agilent 81482B, Agilent 81672B, Agilent 81642B, and Agilent 81682B Tunable Laser modules.

20 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

What is a Tunable Laser? Overview of Tunable Laser Sources

What is a Tunable Laser?

A Tunable Laser is a laser source for which the wavelength can be varied through a specified range. The Agilent Technologies range of Tunable Laser modules also allow you to set the output power, and to choose between continuous wave or modulated power.

Output Types

The tunable laser sources are available with a selection of different ouputs to suit your measurement application. There are modules that have different operating wavelength bands, output powers, number of outputs, and different connector types as options.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 21

Overview of Tunable Laser Sources What is a Tunable Laser?

Agilent 81480B/82B, 81680B/72B/82B/40B/42B Tunable Laser Modules

81480B

Input

TUNABLE LASER 1400 nm

Output

Output 1

Active Active

Output 2

Figure 3 Agilent 81480B Tunable Laser Module (straight contact connectors)

81680B

Input

TUNABLE LASER 1550 nm

Output

Output 1

Active Active

Output 2

Figure 4 Agilent 81680B Tunable Laser Module (straight contact connectors)

81482B

Input

TUNABLE LASER 1400 nm

Output

Active

Figure 5 Agilent 81482B Tunable Laser Module (straight contact connector)

81682B

Input

TUNABLE LASER 1550 nm

Output

Active

Figure 6 Agilent 81682B Tunable Laser Module (straight contact connector)

81640B

Input

TUNABLE LASER 1600 nm

Output

Output 1

Active Active

Output 2

Figure 7 Agilent 81640B Tunable Laser Module (straight contact connectors)

22 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

What is a Tunable Laser? Overview of Tunable Laser Sources

81672B

Input

TUNABLE LASER 1300 nm

Output

Active

Figure 8 Agilent 81672B Tunable Laser Module (straight contact connectors)

81642B

Input

TUNABLE LASER 1600 nm

Output

Active

Figure 9 Agilent 81642B Tunable Laser Module (straight contact connectors)

The Agilent 81480B/82B and 81680B/82B/40B/42B/72B Tunable Laser modules are back-loadable modules. To fit these modules into the Agilent 8164A/B mainframe see “How to Fit and Remove Modules” in the Agilent 8163A/B Lightwave Multimeter, Agilent 8164A/B, Lightwave Measurement System, & Agilent 8166A/B Lightwave Multichannel System User’s Guide.

The Agilent 81480B/82B and 81680B/82B/40B/42B/72B Tunable Laser modules have a built-in wavelength control loop to ensure high wavelength accuracy. As these modules are all mode-hop free tunable with continuous output power, they qualify for the test of the most critical dense-Wavelength Division Multiplexer (dWDM) components.

The Agilent 81480B and Agilent 81640B/80B Tunable Laser modules are equipped with two optical outputs:

• Output 1, the Low SSE output, delivers a signal with ultra-low

source spontaneous emission (SSE). It enables accurate crosstalk measurement of DWDM components with many channels at narrow spacing. You can characterize steep notch filters such as Fiber Bragg Gratings by using this output and a power sensor module.

• Output 2, the High Power output, delivers a signal with high optical

power. You can adjust the signal by more than 60 dB by using the built-in optical attenuator.

The Agilent 81672B, Agilent 81482B and Agilent 81682B/42B Tunable Laser module delivers a signal with high optical power. If you choose Option 003, you can adjust the signal by more than 60 dB by using the built-in optical attenuator.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 23

Overview of Tunable Laser Sources Optical Output

Optical Output

Polarization Maintaining Fiber

If you have an instrument with a polarization maintaining fiber (PMF), the PMF is aligned to maintain the state of polarization.

The fiber is of Panda type, with TE mode in the slow axis in line with the connector key. A well defined state of polarization ensures constant measurement conditions.

The Agilent 81480B/82B and 81680B/40B/82B/42B/72B Tunable Laser modules are equipped with PMF outputs as standard.

Stress Rods

Figure 10 PMF Output Connector

Angled and Straight Contact Connectors

Angled contact connectors help you to control return loss. With angled fiber endfaces, reflected light tends to reflect into the cladding, reducing the amount of light that reflects back to the source.

Connector Key

Fiber Cladding

Fiber Core

(9-µm Diameter)

Slow Axis (Polarization Axis)

Not to Scale

The Agilent 81480B/82B and 81680B/40B/82B/42B/72B Tunable Laser modules can have the following connector interface options:

• Option 071, Polarization-maintaining fiber straight contact connectors, or

• Option 072, Polarization-maintaining fiber angled contact connectors.

24 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Signal Input and Output Overview of Tunable Laser Sources

CAUTION If the contact connector on your instrument is angled, you can only

use cables with angled connectors with the instrument.

Angled Contact

Connector Symbol

Straight Contact

Connector Symbol

Figure 11 Angled and Straight Contact Connector Symbols

Figure 11 shows the symbols that tell you whether the contact connector of your Tunable Laser module is angled or straight. The angled contact connector symbol is colored green.

Figure 6 and Figure 12 show the front panel of the Agilent 81682B Tunable Laser module with straight and angled contact connectors respectively.

You should connect straight contact fiber end connectors with neutral sleeves to straight contact connectors and connect angled contact fiber end connectors with green sleeves to angled contact connectors.

NOTE You cannot connect angled non-contact fiber end connectors with

orange sleeves directly to the instrument.

81682B

Input

TUNABLE LASER 1550 nm

Output

Active

Figure 12 Agilent 81682B Tunable Laser Module (angled contact connector)

See “Accessories” on page 27 for further details on connector interfaces and accessories.

Signal Input and Output

CAUTION There are two BNC connectors on the front panel of the

Agilent 81480B, Agilent 81680B, Agilent 81640B, Agilent 81482B, Agilent 81672B, Agilent 81682B, and Agilent 81642B - a BNC input connector and a BNC output connector.

An absolute maximum of ±6 V can be applied as an external voltage to any BNC connector.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 25

Overview of Tunable Laser Sources Signal Input and Output

26 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Accessories

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 27

Accessories

The Agilent 81480B/82B and 81680B/40B/82B/42B/72B Tunable Laser Source Modules are available in various configurations for the best possible match to the most common applications.

This chapter provides information on the available options and accessories.

28 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Modules and Options Accessories

Modules and Options

Figure 13 shows all the options that are available for all Tunable Laser modules and the instruments that support these modules.

Agilent 8164A/B Lightwave Measurement System

Tunable L a s e r Sources

Low SSE Modules

81480B - 1400 nm 81680B - 1550 nm 81640B - 1600 nm

Tun able L ase r Sources

Low SSE

Option 071

PMF Straight contact interface

Connector interfaces for straight connectors

Tun able L ase r Sources

High Power

Option 003

Attenuator (built-in) (except 81672B)

Option 072

PMF Angled contact interface

Connector interfaces for angled connectors

Tunable Laser Sources

High PowerModules

81672B - 1300 nm, +10 dBm 81482B - 1400 nm, +8.5 dBm 81682B - 1550 nm, +8 dBm 81642B - 1600 nm, +8.5 dBm

Filler Module

Specify 81645A Filler Module if no high performance tunable laser is installed

Figure 13 Agilent 8164A/B mainframes, Tunable Laser Modules, and Options

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 29

Accessories Modules

Modules

The Agilent 8164A/B Lightwave Measurement System supports the Agilent 81480B and 81680B/40B/82B/42B/72B Tunable Laser modules. .

Tunable Laser Modules

Model No. Description

Agilent 81480B Tunable Laser for the Test of Critical dense-WDM Components

Agilent 81680B Tunable Laser for the Test of Critical dense-WDM Components

Agilent 81640B Tunable Laser for the Test of Critical Components in both

dense-WDM Bands, the C and L bands

Agilent 81672B Tunable Laser for the Test of Optical Amplifiers and Passive

Components

Agilent 81482B Tunable Laser for the Test of Optical Amplifiers and Passive

Components

Agilent 81682B Tunable Laser for the Test of Optical Amplifiers and Passive

Components

Agilent 81642B Tunable Laser for the Test of Optical Amplifiers and Passive

Components in both dense-WDM Bands.

Filler Module

Model No. Description

Agilent 81645A Filler Module

The Agilent 81645A Filler Module is required to operate the Agilent 8164A/B mainframe if it is used without a back-loadable Tunable Laser module. It can be used to:

• prevent dust pollution and

• optimize cooling by guiding the air flow.

See the "Installation and Maintenance" chapter of the Agilent 81680B, Agilent 81682B, & Agilent 81640B Tunable Laser Modules User’s Guide for more details on installing the Agilent 81645A Filler Module.

30 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Modules Accessories

User’s Guides

Opt Description Part No.

Agilent 81680B, Agilent 81682B, & Agilent 81640B Tunable Laser Modules User’s Guide

ABJ Japanese Agilent 81680B, Agilent 81682B, & Agilent 81640B Tun-

able Laser Modules User’s Guide

ABF French Agilent 81680B, Agilent 81682B, & Agilent 81640B Tunable

Laser Modules User’s Guide

AB0 Traditional Chinese (Taiwan) Agilent 81680B, Agilent 81682B, &

Agilent 81640B Tunable Laser Modules User’s Guide

AB1 Korean Agilent 81680B, Agilent 81682B, & Agilent 81640B Tunable

Laser Modules User’s Guide

8164A 0B2 Agilent 8163A/B Lightwave Multimeter, Agilent 8164A/B Light-

wave Measurement System, & Agilent 8166A/B Lightwave Multichannel System Programming Guide

8164A 0BF Agilent 8163A/B Lightwave Multimeter, Agilent 8164A/B Light-

wave Measurement System, & Agilent 8166A/B Lightwave Multichannel System User’s Guide

Options

81680-90B12

81680-95B11

81680-92B11

81680-97B11

81680-98B11

08164-90B62

08164-90B13

Option 003 - Agilent 81482B, Agilent 81682B,

Agilent 81642B

Built-in optical attenuator with 60 dB attenuation range.

NOTE The Agilent 81640B, Agilent 81680B, and Agilent 81480B Tunable

Laser Modules have a built-in optical attenuator as standard for Output 2, the High Power output.

Option 071 - All Tunable Laser Modules

Polarization-maintaining fiber, Panda-type, for straight contact connectors.

Option 072 - All Tunable Laser Modules

Polarization-maintaining fiber, Panda-type, for angled contact connectors.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 31

Accessories Connector Interfaces and Other Accessories

Connector Interfaces and Other Accessories

The Agilent 81480B/82B and 81680B/40B/82B/42B/72B Tunable Laser modules are supplied with one of two connector interface options:

• Option 071, Polarization-maintaining fiber straight contact connectors, or

• Option 072, Polarization-maintaining fiber angled contact connectors.

Option 071: Straight Contact Connector

If you want to use straight connectors (such as FC/PC, Diamond HMS10, DIN, Biconic, SC, ST or D4) to connect to the instrument, you must do the following:

1 Attach your connector interface to the interface adapter.

See Table 1 for a list of the available connector interfaces.

2 Connect your cable (see Figure 14).

Agilent 810

00AI

Connector

Interface Diamond

HMS-10

Agilent 810

00FI

Connector

Interface

FC/PC/SPC

Agilent 810

00GI

Connector

Interface

Agilent 810

00HI

Connector

Interface

Diamond

E-2000 APC

Agilent 810

00KI

Connector

Interface

SC/PC/SPC

Figure 14 Option 071: PMF with Straight Contact Connectors

Agilent 810

00SI

Connector

Interface

DIN 47256

Agilent 810

00VI

Connector

Interface

Agilent 8100

0WI

Connector

Interface

Biconic

32 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Connector Interfaces and Other Accessories Accessories

Table 1 Straight Contact Connector Interfaces

Description Model No.

Biconic Agilent 81000 WI

D4 Agilent 81000 GI

Diamond HMS-10 Agilent 81000 AI

DIN 47256 Agilent 81000 SI

FC / PC / SPC Agilent 81000 FI

SC / PC / SCP Agilent 81000 KI

ST Agilent 81000 VI

Diamond E-2000 APC Agilent 81000 HI

Option 072: Angled Contact Connector

If you want to use angled connectors (such as FC/APC, Diamond HRL10, or SC/APC) to connect to the instrument, you must do the following:

1 Attach your connector interface to the interface adapter.

See Table 2 for a list of the available connector interfaces.

2 Connect your cable (see Figure 15).

Agilent 8100

0NI

Connector

Interface FC/APC

Agilent 8100

0KI

Connector

Interface

SC/PC/APC

Agilent 8100

0HI

Connector

Interface Diamond

E-2000 APC

Agilent 8100

0SI

Connector Interface DIN 47256/4108.6

Figure 15 Option 072: PMF with Angled Contact Connector

Table 2 Angled Contact Connector Interfaces

Description Model No.

DIN 47256-4108.6 Agilent 81000 SI

FC / APC Agilent 81000 NI

SC / PC / APC Agilent 81000 KI

Diamond E-2000 APC Agilent 81000 HI

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 33

Accessories Connector Interfaces and Other Accessories

34 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Specifications

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 35

Specifications

The Agilent 81672B, Agilent 81480B, Agilent 81680B, Agilent 81640B, Agilent 81482B, Agilent 81682B, and Agilent 81642B Tunable Laser modules are produced to the ISO 9001 international quality system standard as part of Agilent Technologies’ commitment to continually increasing customer satisfaction through improved quality control.

Specifications describe the modules’ warranted performance. Supplementary performance characteristics describe the modules non-warranted typical performance.

Because of the modular nature of the instrument, these performance specifications apply to the modules rather than the mainframe unit.

36 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Definition of Terms Specifications

Definition of Terms

This section defines terms that are used both in this chapter and “Performance Tests” on page 69.

Generally, all specifications apply for the given environmental conditions after the stated warm-up time.

A Typical Value is a characteristic describing the product performance that is usually met but not guaranteed.

Measurement principles are indicated. Alternative measurement principles of equal value are also acceptable.

Static Conditions

The static specifications describe the behavior of the instrument when stepping.

Absolute Wavelength Accuracy

The maximum difference between the actual wavelength and the displayed wavelength of the TLS. Wavelength is defined as the wavelength in vacuum.

Conditions: constant power level, temperature within operating temperature range, coherence control off, measured at high power output.

Validity: within given time span after wavelength zeroing, at a given maximum temperature difference between calibration and measurement.

Measurement with wavelength meter. Averaging time given by wavelength meter, ≥1 s.

NOTE The absolute wavelength accuracy of Output 1, the Low SSE Output, of

the Agilent 81480B, Agilent 81680B/40B Tunable Laser modules is the same as the absolute wavelength accuracy of Output 2, the High Power Output (guaranteed by design).

Effective Linewidth

The time-averaged 3 dB width of the optical spectrum, expressed in Hertz.

Conditions: temperature within operating temperature range, coherence control on, power set to specified value.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 37

Specifications Definition of Terms

Measurement with heterodyning technique: the output of the laser under test is mixed with another laser of the same type on a wide bandwidth photodetector. The electrical noise spectrum of the photodetector current is measured with an Agilent Lightwave Signal Analyzer, and the linewidth is calculated from the heterodyne spectrum (Lightwave signal analyzer settings: resolution bandwidth 1 MHz; video bandwidth 10 kHz; sweep time 20 ms; single scan).

Linewidth

The 3-dB width of the optical spectrum, expressed in Hertz.

Conditions: temperature within operating temperature range, coherence control off, power set to maximum flat power (maximum attainable power within given wavelength range).

Measurement with self-heterodyning technique: the output of the laser under test is sent through a Mach-Zehnder interferometer in which the length difference of the two paths is longer than the coherence length of the laser. The electrical noise spectrum of the photodetector current is measured with an Agilent Lightwave Signal Analyzer, and the linewidth is calculated from the heterodyne spectrum (Lightwave signal analyzer settings: resolution bandwidth 1 MHz; video bandwidth 10 kHz; sweep time 20 ms; single scan).

Alternative measurement with heterodyning technique: the output of the laser under test is mixed with another laser beam of the same type on a wide bandwidth photodetector. The electrical noise spectrum of the photodetector current is measured with an Agilent Lightwave Signal Analyzer, and the linewidth is calculated from the heterodyne spectrum.

Lightwave signal analyzer settings: resolution bandwidth 1 MHz; video bandwidth 10 kHz; sweep time 20 ms; single scan.

Minimum Output Power

The minimum output power for which the specifications apply.

Mode-Hop Free Tuning Range

The tuning range for which no abrupt wavelength change occurs during fine wavelength stepping. Abrupt change is defined as change of more than 25 pm.

Conditions: within specified wavelength range, at specified temperature range and output power. Tuning from outside into the mode-hop free tuning range is not allowed.

38 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Definition of Terms Specifications

Modulation Depth

The peak-to-peak optical power change divided by the average optical power for a given sinusoidal input voltage at the analog modulation input, expressed in percent.

Conditions: at a specified output power and wavelength range, temperature within operating temperature range, at a given sinusoidal input voltage.

Measurement: with a photoreceiver and oscilloscope.

Modulation Extinction Ratio

The ratio of total power in on-state to total power in off-state, expressed in dB.

Conditions: Internal or external modulation, tunable laser at highest power setting.

Measurement with optical spectrum analyzer. Tunable laser switched on and off.

Modulation Frequency Range

The range of frequencies for which the modulation index is above − 3 dB of the highest modulation index. In this context, modulation index is defined as half of the peak-to-peak AC power amplitude, divided by the average power.

Output Power

The achievable output power for the specified TLS tuning range.

Conditions: temperature within operating temperature range.

Measurement: with power meter at the end of a single-mode fiber

patch cord.

Output Isolation

The insertion loss of the built-in isolator in the backward direction.

Measurement: Cannot be measured from the outside. This characteristic is based on known isolator characteristics.

Peak Power

The highest optical power within specified wavelength range.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 39

Specifications Definition of Terms

Polarization Extinction Ratio

The ratio of optical power in the slow axis of the polarizationmaintaining fiber to optical power in the fast axis within a specified wavelength range.

Conditions: only applicable for TLS with polarization maintaining fiber with the TE mode in slow axis and oriented in line with connector key, at constant power level.

Measurement with a polarization analyzer at the end of a polarizationmaintaining patch cord, by sweeping the wavelength, thereby creating circular traces on the Poincaré sphere, then calculating the polarization extinction ratio from the circle diameters.

Power Flatness Over Modulation

When changing the modulation frequency, and measuring the differences between actual power level and the displayed power level (in dB), the power flatness is ± half the span between the maximum and the minimum value of all differences.

Conditions: uninterrupted line voltage, constant power setting, temperature variation within ±2 K, external modulation ON, at the given wavelengths.

Measurement with optical power meter.

Power Flatness Versus Wavelength

When changing the wavelength at constant power setting and recording the differences between actual and displayed power levels, the power flatness is ± half the span (in dB) between the maximum and the minimum of the measured power levels.

Conditions: uninterrupted TLS output power, constant power setting, temperature variation within ±1K, coherence control off.

Measurement with optical power meter.

Power Linearity

When changing the power level and measuring the differences (in dB) between actual and displayed power levels, the power linearity is ± half the span (in dB) between the maximum and the minimum value of all differences.

Conditions: power levels from within specified output power range, uninterrupted TLS output power, fixed wavelength settings and constant temperature (power drift effects excluded), coherence control off.

Measurement with optical power meter.

40 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Definition of Terms Specifications

Power Repeatability

The random uncertainty in reproducing the power level after changing and re-setting the power level. The power repeatability is ± half the span (in dB) between the highest and lowest actual power.

Conditions: uninterrupted TLS output power, constant wavelength, temperature variation within ±1 K, observation time 10 min., coherence control off.

Measurement with optical power meter.

NOTE The long-term power repeatability can be obtained by taken the power

repeatability and power stability into account.

Power Stability

The change of the power level during given time span, expressed as ± half the span (in dB) between the highest and lowest actual power.

Conditions: uninterrupted TLS output power, constant wavelength and power level settings, temperature variation within ±1 K, time span as specified, coherence control off.

Measurement with optical power meter.

Relative Intensity Noise (RIN)

The square of the (spectrally resolved) RMS optical power amplitude,

, divided by the measurement bandwidth, Be, and the square of

RMS

the average optical power, P

RIN 10

æö

RMS

---------- ----------

ç÷ èø

avg

-------log=

, expressed in dB/Hz.

avg

Conditions: at specified output power, coherence control off, temperature within operating temperature range, frequency range 0.1 to 6 GHz.

Measurement with Agilent Lightwave Signal Analyzer.

Relative Wavelength Accuracy

When randomly changing the wavelength and measuring the differences between the actual and displayed wavelengths, the relative wavelength accuracy is ± half the span between the maximum and the minimum value of all differences.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 41

Specifications Definition of Terms

Conditions: uninterrupted TLS output power, constant power level, temperature within operating temperature range, observation time 10 minutes maximum (constant temperature), coherence control off, measured at high power output.

Measurement with wavelength meter. Averaging time given by wavelength meter, ≥1 s.

NOTE The relative wavelength accuracy of Output 1, the Low SSE Output, of

the Agilent 81480B, Agilent 81640B/80B Tunable Laser modules is the same as the relative wavelength accuracy of Output 2, the High Power Output (guaranteed by design).

Return Loss

The ratio of optical power incident to the TLS output port, at the TLS's own wavelength, to the power reflected from the TLS output port.

Conditions: TLS disabled.

Sidemode Suppression Ratio

The ratio of optical power in the main mode to the optical power of the highest sidemode within a distance of 0.1 to 6 GHz to the main signal's optical frequency, expressed in dB.

signal

SSR 10

Conditions: at a specified output power and wavelength range, temperature within operating temperature range, coherence control off.

Measurement with the Agilent Lightwave Signal Analyzer, by analyzing the heterodyning between the main signal and the highest sidemode.

æö

---------- ------------- ------------ -----

èø

highestsidemode

dB[]log=

Signal-to-Source Spontaneous Emission (SSE) Ratio

The ratio of signal power to maximum spontaneous emission power in 1 nanometer bandwidth within a ±3 nm window around the signal wavelength, where ±1 nm around the signal wavelength is excluded, at the specified output power, expressed in dB/nm.

Conditions: output power set to specified values, at temperatures within operating temperature range, coherence control off.

42 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Definition of Terms Specifications

Measurement with optical spectrum analyzer (OSA) at 0.5 nm resolution bandwidth (to address the possibility of higher SSE within a narrower bandwidth), then extrapolated to 1 nm bandwidth. On lowSSE output (if applicable), with fiber Bragg grating inserted between the TLS and the OSA in order to suppress the signal, thereby enhancing the dynamic range of the OSA.

NOTE The specified signal-to-SSE ratio is also applicable to output powers

higher than the specified values.

Signal-to-Total-Source Spontaneous Emission

The ratio of signal power to total spontaneous emission power, at the specified achievable output power, expressed in dB.

Conditions: output power set to specified values, at temperatures within operating temperature range, coherence control off.

Measurement with optical spectrum analyzer, by integrating the source spontaneous emission and excluding the remnant signal. On low-SSE output (if applicable), with fiber Bragg grating inserted between the TLS and the OSA in order to suppress the signal, thereby enhancing the dynamic range of the OSA.

NOTE The specified signal-to-total-SSE ratio is also applicable to output

powers higher than the specified values.

Wavelength Range

The range of wavelengths for which the specifications apply.

Wavelength Repeatability

The random uncertainty in reproducing a wavelength after detuning and re-setting the wavelength. The wavelength repeatability is ± half the span between the maximum and the minimum value of all actual values of this wavelengths.

Conditions: uninterrupted TLS output power, constant power level, temperature within operating temperature range, coherence control off, short time span.

Measurement with wavelength meter at high power output. Averaging time given by wavelength meter, ≥1 s.

NOTE The wavelength repeatability of Output 1, the Low SSE Output, of the

Agilent 81480B, Agilent 81680B/40B Tunable Laser modules is the same as the relative wavelength accuracy of Output 2, the High Power Output (guaranteed by design).

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 43

Specifications Definition of Terms

NOTE The long-term wavelength repeatability can be obtained by taken the

wavelength re.peatability and wavelength stability into account.

Wavelength Resolution

The smallest selectable wavelength increment/decrement.

Wavelength Stability

The change of wavelength during given time span, expressed as ± half the span between the maximum and the minimum of all actual wavelengths.

Conditions: uninterrupted TLS output power, constant wavelength and power level settings, coherence control off, temperature variation within ±1 K, time span as specified.

Measurement with wavelength meter. Averaging time given by wavelength meter, ≥1 s.

44 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Definition of Terms Specifications

Dynamic Conditions

The dynamic specifications describe the behavior of the instrument when sweeping over the wavelength range.

Add-on Specification Under Dynamic Conditions

These are the values to be arithmetically summed to the corresponding static uncertainties to get the total uncertainties in dynamic operations (swept mode). The total uncertainty is obtainable with the following formula:

Tot alSpec

dynamic

= Spec

static

+ add-on

dynamic

NOTE This arithmetic sum is used in the data sheet for the convenience of

the reader. This has no relationship to the method of measuring and calculating these characteristics. See the Performance Test for further explanations.

Logged Wavelength

The wavelength measured by the internal wavelength meter. This wavelength can be read with the logging function

Wavelength Accuracy

(nm)

actual

logged

When sweeping

actual

(nm)

Dynamic relative wavelength accuracy

Dynamic absolute wavelength accuracy

The diagram above shows the relationship between the two wavelength accuracy parameters specified.

Dynamic absolute wavelength accuracy

The maximum difference between the Logged Wavelength and the actual wavelength in the swept mode. Wavelength is defined as the wavelength in vacuum.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 45

Specifications Definition of Terms

Conditions: same as static, at specified sweep speed, no mode hop.

Measurement: with optical power meter, via IL measurement of

reference component exhibiting many stable transmission peaks (Wavelength Reference Unit), relative to the static conditions, with linear interpolation of logged wavelengths. The transmission peaks represent the control points.

Dynamic relative wavelength accuracy

When measuring the differences between the actual and logged wavelength in swept mode, the dynamic relative wavelength accuracy

±half the span between the maximum and minimum value of all

is differences.

Conditions: same as static, at specified sweep speed, no mode hop.

Measurement: with optical power meter, via IL measurement of

Dynamic wavelength repeatability

The random uncertainty in reproducing the Logged Wavelength when sweeping many times is expressed as maximum and minimum of all values of this Logged Wavelength.

(nm)

actual

Conditions: same as static, at specified sweep speed, no mode hop.

Measurement: with optical power meter, via IL measurement of

reference component exhibiting many stable transmission peaks (Wavelength Reference Unit), with linear interpolation of the logged wavelength. The transmission peaks represent the control points.

repetition

Dynamic wavelength

repeatability

±half the span between the

46 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Definition of Terms Specifications

Dynamic power flatness

When recording the actual output power of the TLS in swept mode, the dynamic power flatness is minimum of the measured power levels.

±half the span between the maximum and

P(dBm)

actual

Dynamic power flatness

(nm)

Dynamic relative power flatness

The high frequency part of the Dynamic power flatness: obtainable by referencing the power measured at high sweep speed to the power measured at low sweep speed.

Conditions: uninterrupted TLS output power, constant power setting, temperature variation within hop.

Measurement: with optical power meter, relative to low sweep speed conditions.

±1K, at specified sweep speed, no mode

Dynamic power reproducibility

The random uncertainty in reproducing the output power at the same actual wavelength referenced to the first sweep, when sweeping many times. It’s expressed as between the maximum and minimum of all actual values of these differences in power.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 47

±half the maximum span over wavelength

Specifications Definition of Terms

sweep

actual

Dynamic power reproducibility

(nm)

(dB)

- Power

Power

Conditions: uninterrupted TLS output power, temperature variation within

±1K, short time span, at specified sweep speed, no mode hop.

Measurement: with optical power meter, power samples linearly interpolated for comparison at the same wavelength.

48 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Tunable Laser Module Specifications Specifications

Tunable Laser Module Specifications

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 49

Specifications Tunable Laser Module Specifications

50 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Tunable Laser Module Specifications Specifications

Agilent 81480B

Wavelength range 1370 nm to 1495 nm

Wavelength resolution 0.1 pm, 15 MHz at 1450 nm

Mode-hop free tuning range

full wavelength range

Max. Tuning speed 80 nm/s (1372 nm – 1495 nm)

Absolute wavelength accuracy

Relative wavelength accuracy

Wavelength repeatability

2, 9

1, 2, 9

Specification under static condition

±10 pm ±0.4 pm ±1.0 pm ±2.5 pm

±5 pm, typ. ±2 pm ±0.4 pm ±0.8 pm ±2.0 pm

±0.8 pm, typ. ±0.5 pm

Add-on specification under dynamic condition (typ.)

@ 5 nm/s @ 40 nm/s @ 80 nm/s

Specification under dynamic condition (typ.)

Dynamic wavelength repeatability

Wavelength stability

2, 9

2, 9, 11

±1 pm

±0.3 pm ±0.4 pm ±0.7 pm

(typ., 24 hours at constant temperature)

Linewidth (typ.), coherence control off

Effective linewidth (typ.), coherence ctrl. on

100 kHz

> 50 MHz (1430 – 1480 nm, at maximum flat output power)

Output 1 (low SSE) Output 2 (high power)

Output power

(continuous power during tuning)

-4.5 dBm peak typ.

-5 dBm (1430 – 1480 nm)

+5.5 dBm peak typ.

+5 dBm (1430 – 1480 nm)

2.1

Minimum output power

Power linearity

Power stability

3, 12

Power flatness versus wavelength

Output 1 (low SSE)

Power flatness versus wavelength

Output 2 (high power)

Dynamic power reproducibility (typ.)

3, 10, 11, 12

-7 dBm (1420 – 1480 nm)

-13 dBm (1370 – 1495 nm)

+3 dBm (1420 – 1480 nm)

-3 dBm (1370 – 1495 nm)

-13 dBm -3 dBm (-60 dBm in attenuation mode)

±0.1 dB (1420 nm – 1495 nm)

typ. ±0.1 dB (1370 nm – 1420 nm)

±0.3 dB (1420 nm – 1495 nm)

typ. ±0.3 dB (1370 nm – 1420 nm)

±0.01 dB, 1 hour (1420 nm – 1495 nm)

typ. ±0.01 dB, 1 hour (1370 nm – 1420 nm)

typ. ±0.03 dB, 24 hours

Specifications under static condition

±0.2 dB, typ. ±0.1 dB

Dynamic relative power flatness (typ.)

@ 5 nm/s @ 40 nm/s @ 80 nm/s

±5 mdB ±15 mdB ±30 mdB

(1420 nm – 1495 nm)

typ. ±0.2 dB

(1370 nm – 1420 nm)

±0.3, dB typ. ±0.2 dB

±5 mdB ±15 mdB ±30 mdB

(1420 nm – 1495 nm)

typ. ±0.3 dB

(1370 nm – 1420 nm)

±5 mdB ±10 mdB ±15 mdB

10, 11

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 51

Specifications Tunable Laser Module Specifications

Power repeatability (typ.)

3, 9, 12

Side-mode suppression ratio (typ.)

4, 8, 9

±3 mdB

40 dB (1430 nm – 1480 nm)

Output 1 (low SSE) Output 2 (high power)

Signal to source spontaneous emission ratio

Signal to total source spontaneous emission ratio

5, 6, 8

6, 8

63 dB/nm

(1430 nm – 1480 nm)

61 dB/nm

(1420 nm – 1480 nm)

55 dB/nm

(typ.,1370 nm – 1495 nm)

60 dB

(1430 nm – 1480 nm)

58 dB

42 dB/nm

(1430 nm – 1480 nm)

40 dB/nm

(1420 nm – 1480 nm)

7, 9

35 dB/nm 9

(typ.,1370 nm – 1495 nm)

28 dB

(typ., 1430 - 1480 nm )

(1420 nm – 1480 nm)

53 dB

7, 9

(typ., 1370nm – 1495 nm)

Relative intensity noise (RIN, typ.)

-145 dB/Hz (1430 – 1480 nm)

1. Valid for one month and within a ±4.4 K temperature range after automatic wavelength zeroing. Wavelength zeroing is an internal funxtion that performs an automatic self-adjustment.

2. At CW operation. Measured with wavelength meter based on wavelength in vacuum.

3. Applies to the selected output.

4. Measured by heterodyne method.

5. Value for 1 nm resolution bandwidth.

6. Measured with optical spectrum analyzer.

7. Measured with fiber Bragg grating to suppress the signal.

8. Output power as specified per wavelength range and output port.

9. Wavelength must not be equal to any water absorption line.

10. Valid for absolute humidity of 11.5 g/m

(For example: Equivalent to 25°C and 50% relative humidity).

11. Conditions: Wavelength range 1430 nm – 1480 nm at flat output power

0 dBm (for Output 2).

12. Warm-up time 1 hour.

-9 dBm (for Output 1) or output power

52 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Tunable Laser Module Specifications Specifications

Agilent 81680B

Wavelength range 1460 nm to 1580 nm

Wavelength resolution 0.1 pm, 12.5 MHz at 1550 nm

Mode-hop free tuning range full wavelength range

Max. Tuning speed 80 nm/s

Absolute wavelength accuracy

Relative wavelength accuracy

Wavelength repeatability

1, 2

Specification under static condition

±10 pm ±0.4 pm ±1.0 pm ±2.5 pm

±5 pm, typ. ±2 pm ±0.4 pm ±0.8 pm ±2.0 pm

±0.8 pm, typ. ±0.5 pm

Add-on specification under dynamic condition (typ.)

@ 5 nm/s @ 40 nm/s @ 80 nm/s

Specification under dynamic condition (typ.)

Dynamic wavelength repeatability

Wavelength stability

2, 10

±1 pm

±0.3 pm ±0.4 pm ±0.7 pm

(typ., 24 hours at constant temperature)

Linewidth (typ.), coherence control off

Effective linewidth (typ.), coherence ctrl. on

100 kHz

> 50 MHz (1480 nm – 1580 nm), at flat output power)

Output 1 (low SSE) Output 2 (high power)

Output power

(continuous power during tuning)

-4 dBm peak typ.

-6 dBm (1520 nm – 1570 nm)

+6 dBm peak typ.

+5 dBm (1520 nm – 1570 nm)

2.2

Minimum output power

Power linearity

Power stability

3, 9

Power flatness versus wavelength Output 1 (low SSE)

Power flatness versus wavelength Output 2 (high power)

Dynamic power reproducibility (typ.)

Power repeatability (typ.)

3,9

Side-mode suppression ratio (typ.)

4, 8

3, 9, 10

-10 dBm (1480 nm – 1580 nm)

-13 dBm (1460 nm – 1580 nm)

+1 dBm (1480 nm - 1580 nm)

-3 dBm (1460 nm - 1580 nm)

-13 dBm -3 dBm (-60 dBm in attenuation mode)

±0.1 dB ±0.3 dB

±0.01 dB, 1 hour

typ. ±0.03 dB, 24 hours

Specifications under static condition

±0.2 dB,

Dynamic relative power flatness (typ.)

@5 nm/s @40 nm/s @80 nm/s

±5 mdB ±15 mdB ±30 mdB

typ. ±0.1 dB

±0.3 dB

±5 mdB ±15 mdB ±30 mdB

typ. ±0.15 dB

±5 mdB ±10 mdB ±15 mdB

±3 mdB

40 dB (1480 nm – 1580 nm)

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 53

Specifications Tunable Laser Module Specifications

Output 1 (low SSE) Output 2 (high power)

Signal to source spontaneous emission ratio

Signal to total source spontaneous emission ratio

5, 6, 8

6, 8

Relative intensity noise (RIN, typ.)

63 dB/nm

(1520 nm – 1570 nm)

58 dB/nm

(typ., 1480 nm – 1580 nm)

53 dB/nm

(typ., 1460 nm – 1580 nm)

60 dB

(1520 nm – 1570 nm)

50 dB

(typ. 1460 nm – 1580 nm)

-145 dB/Hz (1480 nm – 1580 nm)

45 dB/nm

(1520 nm – 1570 nm)

40 dB/nm

(1480 nm – 1580 nm)

35 dB/nm

(1460 nm – 1580 nm)

30 dB

(typ., 1520 nm – 1570 nm )

1. Valid for one month and within a ±4.4 K temperature range after automatic wavelength zeroing. Wavelength zeroing is an internal function that performs an automatic self-adjustment.

2. At CW operation. Measured with wavelength meter based on wavelength in vacuum.

3. Applies to the selected output.

4. Measured by heterodyne method.

5. Value for 1 nm resolution bandwidth.

6. Measured with optical spectrum analyzer.

7. Measured with fiber Bragg grating to suppress the signal.

8. Output power as specified per wavelength range and output port.

9. Warm up time 1 hour.

10. Conditions: Wavelength range 1520 nm – 1570 nm, at flat output power

output power

1 dBm (for Output 2).

-8 dBm (for Output 1) or

54 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Tunable Laser Module Specifications Specifications

Agilent 81640B

Wavelength range 1495 nm to 1640 nm

Wavelength resolution 0.1 pm, 12.5 MHz at 1550 nm

Mode-hop free tuning range full wavelength range

Max. Tuning speed 80 nm/s

Absolute wavelength accuracy

Relative wavelength accuracy

Wavelength repeatability

1, 2

Specification under static condition

±10 pm ±0.4 pm ±1.0 pm ±2.5 pm

±5 pm, typ. ±2 pm ±0.4 pm ±0.8 pm ±2.0 pm

±0.8 pm, typ. ±0.5 pm

Add-on specification under dynamic condition (typ.)

@ 5 nm/s @ 40 nm/s @ 80 nm/s

Specification under dynamic condition (typ.)

Dynamic wavelength repeatability

Wavelength stability

2, 10

±1 pm

±0.3 pm ±0.4 pm ±0.7 pm

(typ., 24 hours at constant temperature)

Linewidth (typ.), coherence control off

Effective linewidth (typ.), coherence ctrl. on

100 kHz

> 50 MHz (1510 nm – 1620 nm, at flat output power)

Output 1 (low SSE) Output 2 (high power)

Output power (continuous power during tuning)

-5 dBm peak typ.

-7 dBm (1520 nm – 1610 nm)

+4 dBm peak typ.

+2 dBm (1520 nm – 1610 nm)

2.2

Minimum output power

Power linearity

Power stability

3, 9

Power flatness versus wavelength Output 1 (low SSE)

Power flatness versus wavelength Output 2 (high power)

Dynamic power reproducibility (typ.)

Power repeatability (typ.)

3,9

Side-mode suppression ratio (typ.)

4, 8

3, 9, 10

-9 dBm (1510 nm – 1620 nm)

-13 dBm (1495 nm – 1640 nm)

0 dBm (1510 nm – 1620 nm)

-5 dBm (1495 nm – 1640 nm)

-13 dBm -5 dBm

(-60 dBm in attenuation mode)

±0.1 dB ±0.3 dB

±0.01 dB, 1 hour typ. ±0.03 dB, 24 hours

Specification under static condition

±0.2 dB

Dynamic relative power flatness (typ.)

@5 nm/s @40 nm/s @80 nm/s

±5 mdB ±15 mdB ±30 mdB

typ. ±0.1 dB

±0.3 dB

±5 mdB ±15 mdB ±30 mdB

typ. ±0.15 dB

±5 mdB ±10 mdB ±15 mdB

±3 mdB

40 dB (1520 nm – 1610 nm)

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 55

Specifications Tunable Laser Module Specifications

Output 1 (low SSE) Output 2 (high power)

Signal to source spontaneous emission ratio

Signal to total source spontaneous emission ratio

5, 6, 8

6, 8

Relative intensity noise (RIN, typ.)

60 dB/nm

(1520 nm – 1610 nm)

55 dB/nm

(typ. 1510 nm – 1620 nm)

50 dB/nm

(typ., 1495 nm – 1640 nm)

55 dB

(1520 nm – 1610 nm)

45 dB

(typ. 1495 nm – 1640 nm)

-145 dB/Hz (1520 nm – 1610 nm)

45 dB/nm

(1520 nm – 1610 nm)

40 dB/nm

(1510 nm – 1620 nm)

35 dB/nm

(1495 nm – 1640 nm)

27 dB

(typ., 1520 nm – 1610 nm )

1. Valid for one month and within a ±4.4 K temperature range after automatic wavelength zeroing.

Wavelength zeroing is an internal function that performs an automatic self-adjustment.

2. At CW operation. Measured with wavelength meter based on wavelength in vacuum.

3. Applies to the selected output.

4. Measured by heterodyne method.

5. Value for 1 nm resolution bandwidth.

6. Measured with optical spectrum analyzer.

7. Measured with fiber Bragg grating to suppress the signal.

8. Output power as specified per wavelength range and output port.

9. Warm up time 1 hour.

10. Conditions: Any 50 nm between 1510 nm – 1620 nm at flat output power

output power

0 dBm (for Output 2)

-9 dBm (for Output 1) or

56 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Tunable Laser Module Specifications Specifications

Agilent 81682B

Wavelength range 1460 nm to 1580 nm

Wavelength resolution 0.1 pm, 12.5 MHz at 1550 nm

Mode-hop free tuning range full wavelength range

Max. Tuning speed 80 nm/s

Absolute wavelength accuracy

Relative wavelength accuracy

Wavelength repeatability

1, 2

Specification under static condition

±10 pm ±0.4 pm ±1.0 pm ±2.5 pm

±5 pm, typ. ±2 pm ±0.4 pm ±0.8 pm ±2.0 pm

±0.8 pm, typ. ±0.5 pm

Add-on specification under dynamic condition (typ.)

@5 nm/s @40 nm/s @80 nm/s

Specification under dynamic condition (typ.)

Dynamic wavelength repeatability

Wavelength stability

2, 10

±1 pm

±0.3 pm ±0.4 pm ±0.7 pm

(typ., 24 hours at constant temperature)

Linewidth (typ.), coherence control off

Effective linewidth (typ.), coherence ctrl. on

Output power (continuous power during tuning)

100 kHz

> 50 MHz (1480 nm – 1580 nm, at flat output power)

+8 dBm peak typ.

+6 dBm (1520 nm – 1570 nm)

2.2

– with option #003

Minimum output power – with option #003

Power linearity – with option #003

Power stability

Power flatness versus wavelength – with option #003

Dynamic power reproducibility (typ.)

Power repeatability (typ.)

±3 mdB

3, 9, 10

+2 dBm (1480 nm – 1580 nm)

-3 dBm (1460 nm – 1580 nm)

reduced by 1.5 dB

-3 dBm

-4.5 dBm (-60 dBm in attenuation mode)

±0.1 dB ±0.3 dB

±0.01 dB, 1 hour (typ. ±0.03 dB, 24 hours)

Specifications under static condition

±0.2 dB, typ. ±0.1 dB ±0.3 dB, typ. ±0.2 dB

Dynamic relative power flatness (typ.)

@5 nm/s @40 nm/s @80 nm/s

±5 mdB ±5 mdB

±5 mdB ±10 mdB ±15 mdB

±15 mdB ±15 mdB

±30 mdB ±30 mdB

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 57

Specifications Tunable Laser Module Specifications

6, 8

4, 8

5, 6, 8

40 dB (1480 nm – 1580 nm)

45 dB/nm (1520 nm – 1570 nm)

40 dB/nm (1480 nm – 1580 nm)

35 dB/nm (1460 nm – 1580 nm)

30 dB (1520 nm – 1570 nm)

-145 dB/Hz (1480 nm – 1580 nm)

Side-mode suppression ratio (typ.)

Signal to source spontaneous emission ratio

Signal to total source spontaneous emission ratio (typ.)

Relative intensity noise (RIN, typ.)

1. Valid for one month and within a ±4.4 K temperature range after automatic wavelength zeroing. Wavelength zeroing is an internal function that performs an automatic self adjustment.

2. At CW operation. Measured with wavelength meter based on wavelength in vacuum.

3. Option #003: built in optical attenuator.

4. Measured by heterodyne method.

5. Value for 1 nm resolution bandwidth.

6. Measured with optical spectrum analyzer.

8. Output power as specified per wavelength range.

9. Warm up time 1 hour.

10. Conditions: Wavelength range 1520 nm to 1570 nm at flat output power

3 dBm (¡ 1.5 dBm 3).

58 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Tunable Laser Module Specifications Specifications

Agilent 81672B

Wavelength range 1260 nm to 1375 nm

Wavelength resolution 0.1 pm, 17.7 MHz at 1300 nm

Mode-hop free tuning range

Full wavelength range

Max. Tuning speed 80 nm/s

Absolute wavelength accuracy

Relative wavelength accuracy

Wavelength repeatability

2, 12

1, 2, 12

Specification under static condition

±10 pm ±0.4 pm ±1.0 pm ±2.5 pm

±5 pm, typ. ±2 pm ±0.4 pm ±0.8 pm ±2.0 pm

±0.8 pm, typ. ±0.5 pm

Add-on specification under dynamic condition (typ.)

@5 nm/s @40 nm/s @80 nm/s

Specification under dynamic condition (typ.)

Dynamic wavelength repeatability

Wavelength stability

2, 12

2, 11, 12

±1 pm

±0.3 pm ±0.4 pm ±0.7 pm

(typ., 24 hours at constant temperature)

Linewidth (typ.), coherence control off

Effective linewidth (typ.), coherence ctrl. on

Output power (continuous power during tuning)

100 kHz

> 50 MHz (1270 NM - 1350 nm at flat output power)

+ 9 dBm peak typ

+7 dBm (1290 nm – 1370 nm)

1.12

+3 dBm (1270 nm – 1375 nm)

0 dBm (1260 nm – 1375 nm)

Minimum output power 0 dBm

Power linearity ±0.1 dB (1260 nm – 1350 nm)

typ. ±0.1 dB (1350 nm – 1375 nm)

Power stability

±0.01 dB, 1 hour (1260 nm – 1350 nm)

typ. ±0.01 dB, 1 hour (1350 nm – 1375 nm)

Dynamic relative power flatness (typ.)

@5 nm/s @40 nm/s @80 nm/s

±5 mdB ±15 mdB ±30 mdB

Power flatness versus wavelength

typ. ±0.03 dB, 24 hours

Specifications under static condition

±0.2 dB, typ. ±0.1 dB (1260 nm – 1350 nm)

typ. ±0.2 dB

(1350 nm – 1375 nm)

Dynamic power reproducibility (typ.)

Power repeatability (typ.)

9, 12

Side-mode suppression ratio (typ.)

9, 10, 11

±3 mdB

4, 8, 12

40 dB (1270 nm – 1375 nm)

±5 mdB ±10 mdB ±15 mdB

10, 11

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 59

Specifications Tunable Laser Module Specifications

Signal to source spontaneous emission ratio

5, 6, 8

Signal to total source spontaneous emission ratio (typ.)

Relative intensity noise (RIN, typ.)

6, 8

45 dB/ nm (1290 nm – 1370 nm)

40 dB/ nm (1270 nm – 1375 nm)

35 dB/ nm (typ.,1260 nm – 1375 nm)

28 dB (1290 nm – 1370 nm)

-145 dB/Hz (1270 nm – 1375 nm)

1. Valid for one month and within a ±4.4 K temperature range after automatic wavelength zeroing. Wavelength zeroing is an internal function that performs an automatic self-adjustment.

2. At CW operation. Measured with wavelength meter based on wavelength in vacuum.

4. Measured by heterodyne method.

5. Value for 1 nm resolution bandwidth.

6. Measured with optical spectrum analyzer.

8. Output power as specified per wavelength range.

9. Warm up time 1 hour.

10. Valid for absolute humidity of 11.5 g/m

11. Conditions: Wavelength range 1300 nm to 1350 nm at flat output power

(For example: Equivalent to 25°C and 50% relative humidity).

3 dBm

12. Wavelength must not be equal to any water absorption line

60 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Tunable Laser Module Specifications Specifications

Agilent 81642B

Wavelength range 1495 nm to 1640 nm

Wavelength resolution 0.1 pm, 12.5 MHz at 1550 nm

Mode-hop free tuning range full wavelength range

Max. Tuning speed 80 nm/s

Absolute wavelength accuracy

Relative wavelength accuracy

Wavelength repeatability

1, 2

Specification under static condition

±10 pm ±0.4 pm ±1.0 pm ±2.5 pm

±5 pm, typ. ±2 pm ±0.4 pm ±0.8 pm ±2.0 pm

±0.8 pm, typ. ±0.5 pm

Add-on specification under dynamic condition (typ.)

@5 nm/s @40 nm/s @80 nm/s

Specification under dynamic condition (typ.)

Dynamic wavelength repeatability

Wavelength stability

2,10

±1 pm

±0.3 pm ±0.4 pm ±0.7 pm

(typ., 24 hours at constant temperature)

Linewidth (typ.), coherence control off

Effective linewidth (typ.), coherence ctrl. on

Output power (continuous power during tuning)

100 kHz

> 50 MHz (1510 nm – 1620 nm, at flat output power)

+8.5 dBm peak typ.

+8 dBm (1560 nm – 1610 nm)

2.1

– with option #003

Minimum output power – with option #003

Power linearity – with option #003

Power stability

Power flatness versus wavelength – with option #003

Dynamic power reproducibility (typ.)

Power repeatability (typ.)

±3 mdB

Side-mode suppression ratio (typ.)

4, 8

3, 9, 10

+6 dBm (1520 nm – 1620 nm)

+4.5 dBm (1510 nm – 1620 nm)

+0 dBm (1495 nm – 1640 nm)

reduced by 1.5 dB

-3 dBm

-4.5 dBm (-60 dBm in attenuation mode)

±0.1 dB ±0.3 dB

±0.01 dB, 1 hour. (typ. ±0.03 dB, 24 hours)

Specifications under static condition

±0.2 dB, typ. ±0.1 dB ±0.3 dB, typ. ±0.2 dB

Dynamic relative power flatness (typ)

@5 nm/s @40 nm/s @80 nm/s

±5 mdB ±5 mdB

±5 mdB ±10 mdB ±15 mdB

40 dB (1520 nm – 1610 nm)

±15 mdB ±15 mdB

±30 mdB ±30 mdB

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 61

Specifications Tunable Laser Module Specifications

Signal to source spontaneous emission ratio

5, 6, 8

Signal to total source spontaneous emission ratio

6, 8

Relative intensity noise (RIN, typ.)

45 dB/nm (1520 nm – 1610 nm)

40 dB/nm (1510 nm – 1620 nm)

35 dB/nm (1495 nm – 1640 nm)

27 dB

(typ. 1520 nm – 1610 nm)

-145 dB/Hz (1520 nm – 1610 nm)

1. Valid for one month and within a ±4.4 K temperature range after automatic wavelength zeroing. Wavelength zeroing is an internal function that performs an automatic self-adjustment.

2. At CW operation. Measured with wavelength meter based on wavelength in vacuum.

3. Option #003: Built in optical attenuator.

4. Measured by heterodyne method.

5. Value for 1 nm resolution bandwidth.

6. Measured with optical spectrum analyzer.

8. Output power as specified per wavelength range.

9. Warm up time 1 hour.

10. Conditions: Any 50 nm between 1510 nm and 1620 nm at flat output power

3 dBm (¡ 1.5 dBm 3).

62 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Tunable Laser Module Specifications Specifications

Agilent 81482B

Wavelength range 1370 nm to 1495 nm

Wavelength resolution 0.1 pm, 15 MHz at 1450 nm

Mode-hop free tuning range

full wavelength range

Max. Tuning speed 80 nm/s (1372 nm – 1495 nm)

Absolute wavelength accuracy

Relative wavelength accuracy

Wavelength repeatability

2, 9

1, 2, 9

Specification under static condition

±10 pm ±0.4 pm ±1.0 pm ±2.5 pm

±5 pm, typ. ±2 pm ±0.4 pm ±0.8 pm ±2.0 pm

±0.8 pm, typ. ±0.5 pm

Add-on specification under dynamic condition

@5 nm/s @40 nm/s @80 nm/s

Specification under dynamic condition (typ.)

Dynamic wavelength repeatability

Wavelength stability

2, 9

2, 9, 11

±1 pm

±0.3 pm ±0.4 pm ±0.7 pm

(typ., 24 hours at constant temperature)

Linewidth (typ.), coherence control off

Effective linewidth (typ.), coherence ctrl. on

Output power (continuous power during tuning)

100 kHz

> 50 MHz (1430 nm – 1480 nm, at flat output power)

+8.5 dBm peak typ

+7.5 dBm (1430 nm – 1480 nm)

(typ.)

2.1

+5 dBm (1420 nm – 1480 nm)

0 dBm (1370 nm – 1495 nm)

– with option #003

Minimum output power – with option #003

Power linearity

reduced by 1.5 dB

-3 dBm

-4.5 dBm (-60 dBm in attenuation mode)

±0.1dB (1420 nm – 1495 nm) typ. ±0.1 dB (1370 nm – 1420 nm)

– with option #003

±0.3dB (1420 nm – 1495 nm) typ. ±0.3 dB (1370 nm – 1420 nm)

Power stability

9, 12

±0.01 dB, 1 hour (1420 nm – 1495 nm)

typ. ±0.01 dB, 1 hour (1370 nm – 1420 nm)

typ. ±0.03 dB, 24 hours

Specification under static condition

Power flatness versus wavelength ±0.2 dB, typ. ±0.1 dB

(1420 nm – 1495 nm)

typ. ±0.2 dB

(1370 nm – 1420 nm)

Dynamic relative power flatness (typ.)

10, 11

@5 nm/s @40 nm/s @80 nm/s

±5 mdB ±15 mdB ±30 mdB

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 63

Specifications Tunable Laser Module Specifications

Power flatness versus wavelength

±0.3 dB, typ. ±0.2 dB

±5 mdB ±15 mdB ±30 mdB

(1420 nm – 1495 nm)

– with option #003

typ. ±0.3 dB

(1370 nm – 1420 nm)

Dynamic power reproducibility

Power repeatability (typ.)

3, 10, 11, 12

9, 12

±3 mdB

Side-mode suppression ratio (typ.)

Signal to source spontaneous emission ratio

5, 6, 8

Signal to total source spontaneous emission ratio (typ.)

Relative intensity noise (RIN, typ.)

4, 8, 9

6, 8

40 dB (1430 nm – 1480 nm)

42 dB/nm (1430 nm – 1480 nm)

40 dB/nm (1420 nm – 1480 nm)

35 dB/nm (typ., 1370 nm – 1495 nm)

28 dB (1430 nm – 1480 nm)

-145 dB/Hz (1430 nm – 1480 nm)

±5 mdB ±10 mdB ±15 mdB

1. Valid for one month and within a ±4.4 K temperature range after automatic wavelength zeroing.

Wavelength zeroing is an internal function that performs an automatic self-adjustment.

2. At CW operation. Measured with wavelength meter based on wavelength in vacuum.

3. Option #003: Built in optical attenuator.

4. Measured by heterodyne method.

5. Value for 1 nm resolution bandwidth.

6. Measured with optical spectrum analyzer.

8. Output power as specified per wavelength range.

9. Wavelength must not be equal to any water absorption line.

10. Valid for absolute humidity of 11.5 g/m

(e.g. equivalent to 25°C and 50% relative humidity).

11. Conditions: Wavelength range 1430 nm – 1480 nm at flat output power

12. Warm up time 1 hour.

3 dBm (¡ 1.5 dBm 3).

64 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Supplementary Performance Characteristics Specifications

Supplementary Performance Characteristics

Operating Modes

Internal Digital Modulation

50% duty cycle, 200 Hz to 300 kHz. Modulation output: TTL reference signal.

Agilent 81480B/82B, Agilent 81680B/40B/82B/42B/72B: displayed wavelength represents average wavelength while digital modulation is active.

External Digital Modulation

> 45% duty cycle, fall time < 300 ns, 200 Hz to 1 MHz. Modulation input: TTL signal.

External Analog Modulation

≤ 15% modulation depth, 5 kHz to 20 MHz. Modulation input: 5 Vp-p.

External Wavelength Locking

> ±70 pm at 10 Hz

±7 pm at 100 Hz

> Modulation input:

±5 V

Coherence Control

For measurements on components with 2-meter long patch cords and connectors with 14 dB return loss, the effective linewidth results in a typical power stability of < effects in the test setup.

±0.025 dB over 1 minute by drastically reducing interference

Continuous Sweep

Tuning speed adjustable up to: 80 nm/s.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 65

Specifications Supplementary Performance Characteristics

Mode-hop free span:

• Agilent 81672B:

Wavelength range 1300nm – 1350 nm at flat output power

• Agilent 81480B:

Wavelength range 1430 nm – 1480 nm at flat output power Output 1) or output power

• Agilent 81482B:

Wavelength range 1430 nm – 1480 nm at flat output power

(

1.5 dBm 3)

• Agilent 81680B:

Wavelength range 1520 nm – 1570 nm at flat output power Output 1) or output power

• Agilent 81682B:

Wavelength range 1520 nm – 1570 nm at flat output power (

1.5 dBm 3).

0 dBm (for Output 2).

1 dBm (for Output 2).

3 dBm

-9 dBm (for

3 dBm

-8 dBm (for

3 dBm

• Agilent 81640B:

Any 50 nm between 1510 nm – 1620 nm at flat output power

Output 1) or output power

• Agilent 81642B:

Any 50 nm between 1510 nm – 1620 nm at flat output power (

1.5 dBm 3)

•

Ambient temperature between +20°C and +35°C.

[

Option #003: Built in optical attenuator]

0 dBm (for Output 2).

-9 dBm (for

3 dBm

Stepped Mode

Full instrument performance.

Please note that the laser is turned off for 3 µs after each wavelength tuning in the range 1620-1640nm (Agilent 81640B only).

General

Output Isolation (typ.):

50 dB

66 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Supplementary Performance Characteristics Specifications

Return loss (typ.):

60 dB (options 022, 072); 40 dB (options 021, 071).

Polarization Maintaining Fiber (Options 071, 072):

Fiber type: Panda. Orientation: TE mode in slow axis, in line with connector key. Extinction Ratio: 16 dB typ.

Laser Class:

The laser sources used in this equipment are classified as class 1M according to IEC 60825-1 (2001).

The laser sources comply with FDA 21 CFR 1040.10 except for deviations pursuant to Laser Notice No. 50 dated 2001-July-26.

Recalibration Period:

2 years.

Warm-up Time:

< 20 min, immediate operation after boot-up.

Environmental

Storage Temperature:

−40°C to +70°C.

Operating Temperature:

+10°C to +35°C .

Humidity:

< 80% R. H. at +10°C to +35°C. Specifications are valid in non-condensing conditions.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 67

Specifications Supplementary Performance Characteristics

68 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Performance Tests

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 69

Performance Tests

The procedures in this section tests the optical performance of the instrument. The complete specifications to which the Agilent 81672B, Agilent 81480B, Agilent 81680B, Agilent 81640B, Agilent 81482B, Agilent 81682B, and Agilent 81642B are tested are given in “Specifications” on page 35. All tests can be performed without access to the interior of the instrument. The performance tests refer specifically to tests using the Diamond HMS-10/Agilent connector.

70 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Required Test Equipment Performance Tests

Required Test Equipment

The equipment required for the Performance Test is listed in Table 3. Any equipment which satisfies the critical specifications of the equipment given in Table 3, may be substituted for the recommended models.

Table 3 Equipment Required

Instrument Description of Instrument/Accessory #071 #072

Agilent 86142B

Agilent 8164A/B Lightwave Measurement System 1 1

WA-1500 Burleigh Wavemeter 1 1

81618A or 81619A

81626B

81634A/B

81637B

Fast Power Meter 1 1

Agilent 81000SA DIN 47256/4108 Connector Adapter 1 1

Agilent 81000AI HMS-10 Connector Interface 1

Agilent 81000SI DIN 47256/4108 Connector Interface 2 2

Agilent 81000FI FC/PC Connector Interface 1 1

Agilent 81101AC Diamond HMS-10/Diamond HMS-10 Patchcord 1

Agilent 81101PC Diamond HMS-10/Agilent FC/PC Patchcord 1

Agilent 81113PC Diamond HMS-10/Agilent FC/Super PC Patchcord 1 1

Agilent 81113SC Diamond HMS-10/Agilent DIN 47256/4108 Patchcord 1

1005-0255 Adapter DIN-DIN 1

N/A Fiber Bragg Grating

N/A Wavelength Reference unit (Fabry-Perot etalon)

N/A Wavelength Reference unit (Michelson Interferometer) -

Optical Spectrum Analyzer 1 1

Optical Head Interface Module 1 1

Standard Optical Head Interface 1 1

Power Sensor 1 1

optional

You can use the HP 71452B or HP 71450A #100 instead of the

Agilent 86142B.

You can use the 81525A + 81533B instead of the 81626B +

8168A/81619A.

You can use the 81532A instead of the 81634A/B.

You can use the 81636B instead of the 81637B. Required

characteristic: Sample rate

For the 81640B, 81680B: approximately 1520nm, 2nm @ 3dB.

40 kHz.

For the 81480B: approximately 1407nm, 2nm @ 3dB.

Required characteristics:

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 71

Performance Tests Required Test Equipment

• Optical length: 9.35

• Reflectivity: 50

• Wavelength range: 1250 - 1650 nm;

• Birefringence: DIN 3140-6 / 20 (i.e. 20 nm/1 cm or 2*10-6)

• Linear polarizer with AR-coating at FP-etalon input (~ 30 dB extinction ratio, aligned with principal state of polarization)

• Temperature dependency: drift < 0.1 pm over the test duration (

15 min). A reasonable target temperature coefficient is < 0.3

pm/K (typically required active temperature regulation)

• Insertion loss (minimum value over the specified wavelength range): < 3.5 dB.

• Fiber connections: angled PM fiber at input (requires DUTindependent patchcord) and angled SM fiber at output.

0.08 mm at 1510 nm;

2%;

Test Reco rd

Results of the performance test may be tabulated in the Test Record provided at the end of the test procedures. It is recommended that you fill out the Test Record and refer to it while doing the test. Since the test limits and setup information are printed on the Test Record for easy reference, the record can also be used as an abbreviated test procedure (if you are already familiar with the test procedures). The Test Record can also be used as a permanent record and may be reproduced without written permission from Agilent Technologies.

Test Failure

Always ensure that you use the correct cables and adapters, and that all connectors are undamaged and extremely clean.

If the Agilent 81480B/82B or Agilent 81680B/40B/82B/42B/72B Tunable Laser module fails any performance test, return the instrument to the nearest Agilent Technologies Sales/Service Office for repair.

Instrument Specification

Specifications are the performance characteristics of the instrument which are certified. These specifications, listed in “Specifications” on page 35, are the performance standards or limits against which the Agilent 81480B/82B and Agilent 81680B/40B/82B/42B/72B Tunable Laser modules can be tested.

72 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Required Test Equipment Performance Tests

The specifications also list some supplemental characteristics of the Agilent 81480B/82B and Agilent 81680B/40B/82B/42B/72B Tunable Laser modules. Supplemental characteristics should be considered as additional information.

Any changes in the specifications due to manufacturing changes, design, or traceability to the National Institute of Standards and Technology (NIST), will be covered in a manual change supplement, or revised manual. Such specifications supersede any that were previously published.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 73

Performance Tests Performance Test Instructions

Performance Test Instructions

NOTE • Make sure that all fiber connectors are clean.

• Turn the instruments on, enable the laser and allow the

instruments to warm up.

• Ensure that the Device Under Test (DUT) and all the test

equipment is held within the environmental specifications given

in “Specifications” on page 35

General Test Setup

Insert your Tunable Laser module from the rear into slot 0 of the Agilent 8164A/B Lightwave Measurement System.

Wavelength Tests

NOTE When performing wavelength tests, zero the Tunable Laser first.

Move to Channel 0, press [Menu], select <λ Zeroing>.

Zeroing takes approximately 2 minutes.

Connect the Tunable Laser module to the Wavelength Meter as shown in Figure 16.

If you use the Agilent 81480B, Agilent 81680B or Agilent 81640B Tunable Laser module, connect the Output 2, the high power output.

Agilent 8164A/B Lightwave Measurement System

Tunable Laser

For #071: use 81000AI and 81101PC For #072: use 81000SI and 81113PC

Figure 16 Test Setup for Wavelength Tests

Straight

Connector

Wavelength Meter

74 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Performance Test Instructions Performance Tests

General Settings of Wavelength Meters for all Wavelength Tests

Set the Burleigh WA-1500 to the following settings:

•Set Display to Wavelength.

•Set Medium to Vacuum.

•Set Resolution to Auto.

•Set Averaging to On.

•Set Input Attenuator to Auto.

Wavelength Accuracy

The steps below explain how to calculate the Relative Wavelength Accuracy, Absolute Wavelength Accuracy, and the Mode Hop Free Tuning Result.

Relative Wavelength Accuracy

1 Move to the Tunable Laser channel of the Agilent 8164A/B

Lightwave Measurement System and press [Menu].

2 Set the menu parameters to the values shown in Table 4.

Table 4 Tunable Laser Channel Settings

Tunable Laser Channel Menu Parameters Values

Modulation <Mod src> <off>

3 If you use the Agilent 81480B, Agilent 81680B Tunable Laser

module or the Agilent 81640B Tunable Laser module: Connect the fiber output to Output 2, the High Power output. Set <Optical Output> to <High Power (2)>.

4 Set the wavelength and power of your Tunable Laser module to the

values given in Table 5.

NOTE For the 81480B and 81482B, some wavelengths are set to odd values to

avoid conflict with water absorption lines.

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Performance Tests Performance Test Instructions

Table 5 Initial Wavelength and Power Settings for Relative Wavelength Accuracy Tests

Module Wavel ength [λ] Power [P]

Agilent 81480B 1370.200 nm −3.00 dBm

Agilent 81482B 1370.200 nm 0.00 dBm

Agilent 81482B (#003) 1370.200 nm −1.50 dBm

Agilent 81680B 1460.000 nm −3.00 dBm

Agilent 81672B 1260.000 nm −3.00 dBm

Agilent 81682B 1460.000 nm −3.00 dBm

Agilent 81682B (#003) 1460.000 nm −4.50 dBm

Agilent 81640B 1495.000 nm −5.00 dBm

Agilent 81642B 1495.000 nm 0.00 dBm

Agilent 81642B (#003) 1495.000 nm −1.50 dBm

5 Press the key beside the laser output to switch on the laser output.

6 Wait until the wavelength meter has settled, then, note the

wavelength displayed on the wavelength meter in the test record.

7 Increase the wavelength setting of the Tunable Laser module by the

steps shown in the test record.

8 Repeat steps 6 and 7 up to the maximum wavelength values shown

in Table 6.

Table 6 Maximum Wavelength for Relative Wavelength Accuracy Tests

Tunable Laser Module Maximum Wavelength Value

Agilent 81480B 1495 nm

Agilent 81672B 1375 nm

Agilent 81680B 1580 nm

Agilent 81640B 1640 nm

Agilent 81482B 1495 nm

Agilent 81682B 1580 nm

Agilent 81642B 1640 nm

9 Repeat steps 4 through 8 another 4 times.

10 From each repetition of the measurements, choose the maximum

and minimum deviations, and note these values in the test record.

11 Determine the Relative Wavelengt h Accuracy Summary of all

repetitions:

– Take the largest Maximum Deviation, and note it as the Largest

Maximum Deviation in the test record.

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Performance Test Instructions Performance Tests

– Take the smallest Minimum Deviation, and note it as the Smallest

Minimum Deviation in the test record.

NOTE The largest Maximum Deviation is the largest positive value and the

smallest Minimum Deviation is the largest negative value (largest deviation above and below zero respectively).

12 Determine the Relative Wavelength Accuracy Result:

Subtract the Smallest Minimum Deviation from the Largest Maximum Deviation. Record this value as the Relative Wavelength Accuracy Result.

Absolute Wavelength Accuracy

13 From the measurements taken in the Relative Wavelength Accuracy

test, pick the largest absolute value from either the Largest Maximum Deviation or the Smallest Minimum Deviation taken in step 12 and note this value as Absolute Wavelength Accuracy.

Mode Hop Free Tuning

14 Move to the Tunable Laser channel of the Agilent 8164A/B

Lightwave Measurement System and press [Menu].

15 Set the menu parameters to the values shown in Table 4.

16 If you are using the Agilent 81480B, Agilent 81680B, or the

Agilent 81640B Tunable Laser module:

Connect the output fiber to Output 2, the High Power output. Set <Optical Output> to <High Power (2)>.

17 Set the wavelength and power of your Tunable Laser module to the

values given in Table 7.

NOTE For the 81480B and the 81482B, some wavelengths are set to odd

values to avoid conflict with water absorption lines.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 77

Performance Tests Performance Test Instructions

Table 7 Initial Wavelength and Power Settings for Relative Wavelength Accuracy Tests

Module Wavelength [λ] Power [P]

Agilent 81480B 1420.000 nm −3.00 dBm

Agilent 81680B 1460.000 nm −3.00 dBm

Agilent 81640B 1495.000 nm −5.00d Bm

Agilent 81672B 1240.000 nm −3.00 dBm

Agilent 81482B 1420.000 nm 0.00 dBm

Agilent 81482B (#003) 1420.000 nm −1.50 dBm

Agilent 81682B 1460.000 nm −3.00 dBm

Agilent 81682B (#003) 1460.000 nm −4.50 dBm

Agilent 81642B 1495.000 nm 0.00 dBm

Agilent 81642B (#003) 1495.000 nm −1.50 dBm

18 Press the key beside the laser output to switch on the laser output.

19 Then perform steps 4 through 8 once.

20 Note the wavelength displayed by the wavelength meter in the test

record.

21 Increase wavelength setting on Tunable Laser by the steps shown in

the test record.

22 Repeat steps 6 and 7 up to the maximum wavelength values shown

in Table 6.

23 Determine the maximum and minimum deviations, and note these

values in the test record.

24 Take the largest value of either the maximum or minimum

deviation. Record this value as the Mode Hop Free Tuning Result.

25 You do not need to repeat the Mode Hop Free Tuning test.

Wavelength Repeatability

1 Move to the Tunable Laser channel of the Agilent 8164A/B

Lightwave Measurement System and press [Menu].

2 Set the menu parameters to the values shown in Table 4.

3 If you are using the Agilent 81480B, Agilent 81680B or the

Agilent 81640B Tunable Laser module: Connect the output fiber to Output 2, the High Power output. Set <Optical Output> to <High Power (2)>.

78 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Performance Test Instructions Performance Tests

4 Set the wavelength and power for each Tunable Laser module to the

values given in Table 8.

NOTE For the 81480B and the 81482B, some wavelengths are set to odd

values to avoid conflict with water absorption lines.

Table 8 Reference Wavelength and Power Settings for Wavelength Repeatability Tests

Module Wa ve length [λ] Power [P]

Agilent 81480B 1370.200 nm −3.00 dBm

Agilent 81680B 1460.000 nm −3.00d Bm

Agilent 81640B 1495.000 nm −3.00 dBm

Agilent 81672B 1260.000 nm −3.00 dBm

Agilent 81482B 1370.200 nm 0.00 dBm

Agilent 81482B #003 1370.200 nm −1.50 dBm

Agilent 81682B 1460.000 nm −3.00 dBm

Agilent 81682B #003 1460.000 nm −4.50 dBm

Agilent 81642B 1495.000 nm 0.00 dBm

Agilent 81642B #003 1495.000 nm −1.50 dBm

5 Press the key beside the laser output to switch on the laser output.

6 Wait until the wavelength meter has settled. Then measure the

wavelength with the wavelength meter and note the result in test record as the reference wavelength, "REF".

7 Set the wavelength of your Tunable Laser module to any wavelength

in its range (in the test record, this is given in column “from wavelength”).

8 Set the wavelength of your Tunable Laser module back to the

Reference Wavelength and wait until the wavelength meter has settled.

9 Measure the wavelength with the Wavelength Meter and note the

result in test record.

10 Repeat steps 7 through 9 with all wavelength settings given in the

“from wavelength” column of the test record.

11 From all wavelength measurements pick the largest measured value

and the smallest measured value.

12 Calculate the wavelength repeatability by subtracting the largest

measured value from the smallest measured value.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 79

Performance Tests Performance Test Instructions

Power Tests

Maximum Output Power

Make sure the instruments have warmed up before starting the measurement.

NOTE • Absolute Power Accuracy is not specified.

• The result of the measurement below is greatly influenced by the quality and the matching of the interconnections used.

1 Set up the equipment as shown in Figure 17.

Agilent 8164A/B Lightwave Measurement System

81618A

Tunable Laser

Slanted

For #071: use 81000FI and 81113PC For #072: use 81000SI and 81113SC

Figure 17 Test Setup for the Maximum Output Power Tests

2 Set the Power Meter to the following settings:

– Select automatic ranging; press Auto as required.

– Set T, the averaging time, to 500 ms.

– Select dBm as the power units.

– While the laser is switched off, zero the power meter. Press Zero

from the Menu.

3 Move to the Tunable Laser channel of the Agilent 8164A/B

Lightwave Measurement System and press [Menu].

4 Set the menu parameters to the values shown in Table 4.

Connector

HP 81525A Optical Head

81000SA

5 If you are using the Agilent 81480B, Agilent 81680B, or the

Agilent 81640B Tunable Laser module: Connect the output fiber to Output 1, the Low SSE output, remember to calibrate the Agilent 81001FF Attenuation Filter. Set <Optical Output> to <Low SSE (1)>.

80 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Performance Test Instructions Performance Tests

6 Set the wavelength and power for each Tunable Laser module to the

values given in Table 9

NOTE For 81480B and 81482B some wavelengths are set to odd values to

avoid conflict with water absorption lines.

Table 9 Reference Wavelength and Power Values for Maximum Output Power Tests

Module Wavelength [λ] Power [P]

Agilent 81480B - Output 1 1370.200 nm +0.00 dBm

Agilent 81480B - Output 2 1370.200 nm +10.00 dBm

Agilent 81680B - Output 1 1460.000 nm +0.00 dBm

Agilent 81680B - Output 2 1460.000 nm +10.00 dBm

Agilent 81640B - Output 1 1495.000 nm +0.00 dBm

Agilent 81640B - Output 2 1495.000 nm +10.00 dBm

Agilent 81482B 1370.200 nm 10.00 dBm

Agilent 81682B 1460.000 nm +10.00 dBm

Agilent 81642B 1495.000 nm +10.00 dBm

Agilent 81672B 1540.000 nm +10.00 dBm

NOTE The laser output is limited to its maximum possible value at this

wavelength, the display will probably show ExP.

7 Press the key beside the laser output to switch on the laser output.

8 Set the wavelength of the 81626B to the same as your Tunable Laser

module, as given in Table 9.

9 Measure the output power with the 81626B and note the result for

this wavelength in the test record.

10 Increase the λ, output wavelength, of the Tunable Laser module to

the next value given in the test record.

11 Increase the wavelength of the 81626B to the same value.

12 Note the measured power in the test record for each wavelength

13 Repeat step 10 to step 12 for the full wavelength range

14 If you are using the Agilent 81680B, Agilent 81480B, or the

Agilent 81640B Tunable Laser module: Connect the output fiber to Output 2, the High Power output, remember to calibrate the Agilent 81001FF Attenuation Filter and set <Optical Output> to <High Power (2)>. Then, perform step 6 through step 13 for the full wavelength range.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 81

Performance Tests Performance Test Instructions

Power Linearity

Power Linearity - Low Power Test

To measure the power linearity of the Low SSE output, Output 1, of the Agilent 81480B, Agilent 81680B, or the of the Agilent 81640B:

1 Set up the equipment as shown in Figure 17.

2 Move to the Tunable Laser channel of the Agilent 8164A/B

Lightwave Measurement System and press [Menu].

3 Set the menu parameters to the values shown in Table 4. <Power

Mode> does not apply.

4 Set the wavelength and power for each Tunable Laser module to the

values given in Table 10.

Table 10 Wavelength and Power Settings for Low Power Linearity Tests

Module Wavelength [λ] Power [P]

Agilent 81480B - Output 1 1460.000 nm −5.00 dBm

Agilent 81680B - Output 1 1540.000 nm −6.00 dBm

Agilent 81640B - Output 1 1560.000 nm −7.00 dBm

5 If you are using the Agilent 81680B, Agilent 81480B, or the

Agilent 81640B Tunable Laser module: Connect the output fiber to Output 1, the Low SSE output. Set <Optical Output> to <Low SSE (1)>.

6 Make sure the optical output is switched off.

7 Set the 81626B to the following settings:

– Zero the 81626B; from Menu, select Zero.

– Automatic ranging is set by default.

– Set the Averaging Time, to 500 ms.

– Select dB as the power units.

–Set

, the wavelength, to the same as your Tunable Laser module,

as given in Table 10.

8 Press the key beside the laser output to switch on the laser. For the

Agilent 81480B, Agilent 81680B and the Agilent 81640B, press the key beside Output 1, the Low SSE output.

9 Record the power displayed by the 81626B.

10 Press Disp−>Ref on the 81626B.

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Performance Test Instructions Performance Tests

11 Change the power setting of your Tunable Laser module to the next

value listed in the test record and record the power displayed by the 81626B again.

12 Record the (relative) power displayed by the 81626B as the

"Measured Relative Power from start".

13 Calculate the "Power Linearity at current setting” as the sum of

"Measured Relative Power from start" and "Power Reduction from start".

14 Repeat step 11 to step 13 for all power levels listed in the test

record.

15 Note the maximum and minimum values of the calculated Power

Linearity values for the various settings and record these in the test record.

16 Subtract the minimum values from the maximum values of the

Power Linearity for the various settings. Record these as the Total Power Linearity for the various settings.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 83

Performance Tests Performance Test Instructions

Example (Agilent 81680B Output 1)

Power LinearityOutput 1

Power Setting

from start

Start = REF −6.0 dBm 0.00 dB + 0.00 dB = 0.00 dB

−7.0 dBm −1.02 dB + 1.00 dB = −0.02 dB

−8.0 dBm −1.92 dB + 2.00 dB = +0.08 dB

−9.0 dBm −3.02 dB + 3.00 dB = −0.02 dB

− 10.0 dBm −3.95 dB + 4.00 dB = +0.05 dB

− 11.0 dBm −5.07 dB + 5.00 dB = −0.07 dB

− 12.0 dBm −5.96 dB + 6.00 dB = +0.04 dB

− 13.0 dBm −7.05 dB + 7.00 dB = −0.05 dB

Maximum Power Linearity at current setting: +0.08 dB

Minimum Power Linearity at current setting: −0.07 dB

Total Power Linearity: (Max Power Linearity − Min Power Linearity) 0.15 dBpp

Measured Relative

Power from start

Power reduction

from start

Power Linearity

at current setting

Power Linearity - High Power Test

Follow the steps below to measure the power linearity (without using attenuation) of any one of the following:

• Output2, the High Power output, of the Agilent 81480B

• Output 2, the High Power output, of the Agilent 81680B

• Output 2, the High Power output, of the Agilent 81640B

• Agilent 81482B standard

• Agilent 81482B #003

• Agilent 81682B standard

• Agilent 81682B #003

• Agilent 81642B standard

• Agilent 81642B #003

• Agilent 81672B

1 Set up the equipment as shown in Figure 17.

2 Move to the Tunable Laser channel of the Agilent 8164A/B

Lightwave Measurement System and press [Menu].

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Performance Test Instructions Performance Tests

3 Set the menu parameters to the values shown in Table 4.

For Agilent 81480B, Agilent 81680B, Agilent 81640B, Agilent 81482B #003, Agilent 81682B #003, and Agilent 81642B #003 tunable lase modules: Set <Power Mode> to <Manual Att>.

4 Set the wavelength and power for each Tunable Laser module to the

values given in Table 11.

Table 11 Wavelength and Power Settings for High Power Linearity Tests without

Attenuation

Module Wave length [λ] Power [P] Attenuation [Atten]

Agilent 81480B - Output 2 1460.000 nm +5.000 dBm 0.000 dB

Agilent 81680B - Output 2 1540.000 nm +5.000 dBm 0.000 dB

Agilent 81640B - Output 2 1560.000 nm +2.000 dBm 0.000 dB

Agilent 81482B 1460.000 nm +7.500 dBm Not applicable

Agilent 81482B #003 1460.000 nm +6.000 dBm 0.000 dB

Agilent 81682B 1540.000 nm +6.000 dBm Not applicable

Agilent 81682B #003 1540.000 nm +4.500 dBm 0.000 dB

Agilent 81642B 1580.000 nm +8.000 dBm Not applicable

Agilent 81642B #003 1580.000 nm +6.500 dBm 0.000 dB

Agilent 81672B 1320.000 nm +7.000 dBm Not applicable

NOTE • If you use the Agilent 81480B Output 2, or Agilent 81680B Output 2,

without attenuation, refer to the table “Power Linearity Output 2, High Power Upper Power Levels” in the related test record.

• If you use the Agilent 81640B Output 2 without attenuation, use the table “Power Linearity Output 2, High Power Upper Power Levels” on page 156.

• If you use the Agilent 81482B #003 without attenuation, use the table “Power Linearity 81482B #003 Upper Power Levels” on page 171.

• If you use the Agilent 81682B #003 without attenuation, use the table “Power Linearity 81682B #003 Upper Power Levels” on page 196.

• If you use the Agilent 81642B #003 without attenuation, use the table “Power Linearity 81642B #003 Upper Power Levels” on page 210.

5 Perform the steps 5 to 17 of the “Power Linearity - Low Power Test”

on page 82.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 85

Performance Tests Performance Test Instructions

Power Linearity - Test Using Attenuation

Follow the steps below to measure the power linearity (while using attenuation) of any one of the following:

• Output 2, the High Power output, of the Agilent 81480B

• Output 2, the High Power output, of the Agilent 81680B

• Output 2, the High Power output, of the Agilent 81640B

• Agilent 81482B #003

• Agilent 81682B #003

• Agilent 81642B #003

1 Set up the equipment as shown in Figure 18.

Agilent 8164A/B Lightwave Measurement System

81634A/B

Tunable Laser

For #071: use 81000FI and 81113PC For #072: use 81000SI and 81113SC

Figure 18 Test Setup for Low Power Linearity Tests

2 Move to the Tunable Laser channel of the Agilent 8164A/B

Lightwave Measurement System and press [Menu].

3 Set the menu parameters to the values shown in Table 4.

For Agilent 81480B, Agilent 81680B, Agilent 81640B, Agilent 81482B#003, Agilent 81642B#003 Agilent 81682B#003: Set <Power Mode> to <Manual Att>.

4 Set the wavelength and power for each Tunable Laser module to the

values given in Table 12.

Slanted

Connector

86 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Performance Test Instructions Performance Tests

Table 12 Wavelength and Power Settings for High Power Linearity Tests with

Attenuation

Module Wavelength [λ] Power [P] Attenuation [Atten]

Agilent 81480B - Output 2 1460.000 nm +0.000 dBm 0.000 dB

Agilent 81680B - Output 2 1540.000 nm +0.000 dBm 0.000 dB

Agilent 81640B - Output 2 1560.000 nm +0.000 dBm 0.000 dB

Agilent 81482B #003 1460.000 nm +0.000 dBm 0.000 dB

Agilent 81682B #003 1540.000 nm +0.000 dBm 0.000 dB

Agilent 81642B #003 1580.000 nm +0.000 dBm 0.000 dB

NOTE If you use the Agilent 81480B Output 2, Agilent 81680B Output 2, or

Agilent 81640B Output 2 with attenuation, use the table “Power Linearity Output 2, High Power by attenuator” on page 143 or “Power Linearity Output 2, High Power by Attenuator” on page 157 respectively.

If you use the Agilent 81482B #003 with attenuation, use the table “Power Linearity 81482B #003 by Attenuator” on page 172.

If you use the Agilent 81682B #003 with attenuation, use the table “Power Linearity 81682B #003 by Attenuator” on page 197.

If you use the Agilent 81642B #003 with attenuation, use the table “Power Linearity 81642B #003 by Attenuator” on page 211.

5 Perform the steps 5 to 17 of the “Power Linearity - Low Power Test”

on page 82.

Power Flatness over Wavelength

Power Flatness over Wavelength - Without Attenuation

NOTE For the 81480B and 81482B, the flatness measurement does not start

before 1420 nm to avoid conflicts with water absorption lines.

Follow the steps below to measure the power flatness over wavelength (without using attenuation):

1 Set up the equipment as shown in Figure 17.

2 Move to the Tunable Laser channel of the Agilent 8164A/B

Lightwave Measurement System and press [Menu].

3 Set the menu parameters to the values shown in Table 4.

For Agilent 81480B, Agilent 81640B, Agilent 81680B,

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 87

Performance Tests Performance Test Instructions

Agilent 81482B #003, Agilent 81642B #003, and Agilent 81682B #003: Set <Power Mode> to <Manual Att>.

4 Set the wavelength and power for each Tunable Laser module to the

values given in Table 13.

Table 13 Wavelength and Power Settings for Power Flatness over Wavelength Tests

without Attenuation

Module Wavelengt h [λ] Power [P] Attenuation [ATTEN]

Agilent 81480B - Output 1 1420.000 nm −13.000 dBm Not applicable

Agilent 81480B - Output 2 1420.000 nm −3.000 dBm 0.000 dB

Agilent 81680B - Output 1 1460.000 nm −13.000 dBm Not applicable

Agilent 81680B - Output 2 1460.000 nm −3.000 dBm 0.000 dB

Agilent 81640B - Output 1 1495.000 nm −13.00 dBm Not applicable

Agilent 81640B - Output 2 1495.000 nm −5.00 dBm 0.000 dB

Agilent 81482B 1420.000 nm 0.000 dBm Not applicable

Agilent 81482B #003 1420.000 nm −1.500 dBm 0.000 dB

Agilent 81682B 1460.000 nm −3.000 dBm Not applicable

Agilent 81682B #003 1460.000 nm −4.500 dBm 0.000 dB

Agilent 81642B 1495.000 nm 0.00 dBm Not applicable

Agilent 81642B #003 1495.000 nm −1.500 dBm 0.000 dB

Agilent 81672B 1260.000 nm −3.000 dBm Not applicable

5 If you are using the Agilent 81480B, Agilent 81680B or the

Agilent 81640B Tunable Laser module: Connect the output fiber to Output 1, the Low SSE output. Set <Optical Output> to <Low SSE (1)>.

6 Set the power meter channel of the 81626B to the following settings:

With the laser still switched off, zero the power meter. Select [Zer0] from [Menu].

Autoranging is set by default.

Set the averaging time, to 500 ms.

Set

, the wavelength, to the same as your Tunable Laser module, as

given in Table 13.

Select dB as the power units.

7 Press the key beside the laser output to switch on the laser.

8 Press the DISP->REF hardkey on the channel menu of the 81626B.

9 Increase the wavelength of the Tunable Laser module and of the

Power Meter to the next value listed in the test record.

88 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Performance Test Instructions Performance Tests

10 Measure the change in output power (the value is in dB). Note the

result in the test record.

11 Repeat steps 7 and 8 for the wavelength settings given in the test

record.

12 From the measurement results calculate the difference between the

maximum and minimum deviation from REF and note the result as the Flatness.

13 If you are using the Agilent 81480B, Agilent 81680B or the

Agilent 81640B Tunable Laser module: Connect the output fiber to Output 2, the High Power output. Set <Optical Output> to <High Power (2)>.

14 Set wavelength and power for each Tunable Laser module to the

values given in Table 13.

Set the range to 0 dBm. Press Up or Down as required.

Set T, the averaging time to 500 ms.

15 Repeat steps 7 to 12.

Power Flatness over Wavelength - Using Attenuation

Follow the steps below to measure the power flatness over wavelength (while using attenuation) of any one of the following:

• Agilent 81480B, Output 2, High Power

• Agilent 81680B, Output 2, High Power

• Agilent 81482B #003, Agilent 81682B #003, Agilent 81642B #003

1 Set up the equipment as shown in Figure 18.

2 Move to the Tunable Laser channel of the Agilent 8164A/B

Lightwave Measurement System and press [Menu].

3 Set the menu parameters to the values shown in Table 4 on page 75.

Set <Power Mode> to <Manual Att>.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 89

Performance Tests Performance Test Instructions

Table 14 Wavelength and Power Settings for Power Flatness over Wavelength Tests with

Attenuation

Module Wavelength [λ] Power [P] Attenuation [Atten]

Agilent 81480B - Output 2 1420.000 nm −3.000 dBm 57.000 dB

Agilent 81680B - Output 2 1460.000 nm −3.000 dBm 57.000 dB

Agilent 81640B - Output 2 1495.000 nm −5.000 dBm 55.000 dB

Agilent 81482B #003 1420.000 nm −1.500 dBm 58.500 dB

Agilent 81682B #003 1460.000 nm −4.500 dBm 55.500 dB

Agilent 81642B #003 1495.000 nm −1.500 dBm 58.500 dB

4 Set the wavelength and power for each Tunable Laser module to the

values given in Table 14.

5 If you are using the Agilent 81480B, Agilent 81680B or the

Agilent 81640B Tunable Laser module: Connect the output fiber to Output 2, the high power output. Set <Optical Output> to <High Power (2)>.

6 Set the power meter channel of the 81626B to the following settings:

Autoranging is set by default.

Set the averaging time, to 500 ms.

Set the module, as given in Table 13.

Select dB as the power units.

7 Ensure that the laser is switched on.

8 Press the DISP->REF key on the channel menu of the81626B.

9 Increase the wavelength of the Tunable Laser module and of the

Power Meter to the next value listed in the test record.

10 Measure the output power. Note the result in the test record

11 Repeat steps 9 and 10 for the wavelength settings given in the test

record.

12 From the measurement results calculate the difference between the

maximum and minimum deviation from REF and note the result as the Flatness.

13 If you are using the Agilent 81480B, Agilent 81680B or the

Agilent 81640B Tunable Laser module: Connect the output fiber to Output 2, the High Power output. Set <Optical Output> to <High Power (2)>.

, the wavelength, to the same as your Tunable Laser

14 Set wavelength and power as given in Table 13.

90 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Performance Test Instructions Performance Tests

15 Repeat steps 7 to 12.

Power Stability

Follow the steps below to measure the power stability:

1 Set up the equipment as shown in Figure 17.

2 Move to the Tunable Laser channel of the Agilent 8164A/B

Lightwave Measurement System and press [Menu].

3 Set the menu parameters to the values shown in Table 4.

4 Set the wavelength and power for each Tunable Laser module to the

values given in Table 15.

Table 15 Wavelength and Power Settings for Power Stability Tests

Module Wavelen gth [λ] Power [P]

Agilent 81480B - Output 1 1460.000 nm −13.000 dBm

Agilent 81480B - Output 2 1460.000 nm − 3.000 dBm (ATT = 0 dB)

Agilent 81680B - Output 1 1540.000 nm −13.000 dBm

Agilent 81680B - Output 2 1540.000 nm − 3.000 dBm (ATT = 0 dB)

Agilent 81640B - Output 1 1560.000 nm −13.00 dBm

Agilent 81640B - Output 2 1560.000 nm − 5.00 dBm (ATT = 0 dB )

Agilent 81482B 1460.000 nm 0.000 dBm

Agilent 81482B #003 1460.000 nm − 1.500 dBm (AT T = 0 dB)

Agilent 81682B 1540.000 nm − 3.000 dBm

Agilent 81682B #003 1540.000 nm − 4.500 dBm (ATT = 0 dB)

Agilent 81642B 1580.000 nm 0.000 dBm

Agilent 81642B #003 1580.000 nm − 1.500 dBm (AT T = 0 dB)

Agilent 81672B 1330.000 nm − 3.000 dBm

5 Ensure that the optical output is switched off.

6 Zero the power meter. Select [Zero] from the [Menu].

7 If you are using the Agilent 81480B, Agilent 81680B or the

Agilent 81640B Tunable Laser module: Connect the output fiber to Output 1, the Low SSE output. Set <Optical Output> to <Low SSE (1)>.

8 Press the key beside the laser output to switch on the laser and wait

1 minute.

9 Select the logging application. Press [Appl], select [Logging].

10 Within the logging application, set the power meter as follows:

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Performance Tests Performance Test Instructions

• Module selection 2.1 (assumes the use of 81619A in slot 2, 81626B is connected to “Head 1”)

•Set λ, the wavelength, to the same as your Tunable Laser module, as given in Table 15.

•Set range to 0 dBm

• Set Ref mode to Value

• Set Samples to 4000

• Set the Average Time to 200ms

• Set Range mode to Common

• Set Power unit to dB.

• Set Ref to the value given in Table 15

11 Start the Logging application by pressing {Measure}. The progress

of the measurement is displayed.

12 When the measurement has finished, select {Analysis}

13 From the Statistics window, note

• the “max” value in the Maximum Deviation field of the test record

• the “min” value in the Minimum Deviation field of the test record

•the “

14 If you are using the Agilent 81480B, Agilent 81680B or the

15 Repeat item list 6 to 13.

NOTE To test power stability, it is sufficient to do it for approximately 15

minutes rather than 1 hour, to ensure that the power control loop works correctly.

P” value in the Power Stability field of the test record

Agilent 81640B Tunable Laser module: Connect the output fiber to Output 2, the high power output. Set <Optical Output> to <High Power (2)>. Then set the wavelength and power to the value given in Table 15.

92 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Performance Test Instructions Performance Tests

Signal-to-Source Spontaneous Emission

See the Definition of Terms section in “Specifications” on page 35 for a definition of Signal-to-Source Spontaneous Emission.

NOTE For 81480B and 81482B, the flatness measurement doesn’t start until

1420 nm, to avoid conflict with water absorption lines.

Signal-to-Source Spontaneous Emission Tests - High Power Outputs

Follow this procedure to test modules with high power outputs:

• Agilent 81480B, Output 2, High Power

• Agilent 81680B, Output 2, High Power

• Agilent 81640B, Output 2, High Power

• Agilent 81482B standard model

• Agilent 81482B #003

• Agilent 81682B standard model

• Agilent 81682B #003

• Agilent 81642B standard model

• Agilent 81642B #003

• Agilent 81672B

1 Connect the Tunable Laser module to the Optical Spectrum

Agilent 8164A/B Lightwave Measurement System

Tunable Laser

For #071: use 81000AI, 81101AC and 81000AI For #072: use 81000SI, 81113PC and 81000FI

Analyzer as shown in Figure 19.

Optical Spectrum Analyzer

Figure 19 Test Setup for the Source Spontaneous Emission Test - High Power Outputs

2 If you are using the Agilent 81480B, Agilent 81680B or the

Agilent 81640B Tunable Laser module: Connect one end of the fiber to Output 2, the High Power output,

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 93

Performance Tests Performance Test Instructions

and the other to the Optical Spectrum Analyzer. On the 8164A/B, set <Optical Output> to <High Power>.

3 At the Tunable Laser channel of the Agilent 8164A/B Lightwave

Measurement System, press [Menu].

4 Set the menu parameters to the values shown in Table 4.

5 Ensure the optical output is switched off.

6 Set the wavelength of your Tunable Laser module to the value given

in Table 16.

Table 16 Wavelength Settings for Source Spontaneous Emission Tests

Module Wavelength [λ]

Agilent 81480B - Output 2 1370.000 nm

Agilent 81680B - Output 2 1460.000 nm

Agilent 81640B - Output 2 1495.000 nm

Agilent 81482B 1370.000 nm

Agilent 81682B 1460.000 nm

Agilent 81642B 1495.000 nm

Agilent 81672B 1260.000 nm

7 Set the power for each Tunable Laser module to the maximum

specified output power as given in the Test Record.

8 Press the key beside the laser output to switch on the laser output.

9 Initialize the Optical Spectrum Analyzer: press Preset, the green

hardkey, and Au to Meas.

10 Set the following on the Optical Spectrum Analyzer:

Set Span to 4 nm. Press Span, enter the value.

Set the resolution Bandwidth to 0.5 nm. Press [AMPL], press [BW Swp], and enter the value.

Set the Sensitivity to -60 dBm. Press [AMPl], press [SENS], and enter the value.

Set the wavelength to the value given for your Tunable laser module in Table 16.

NOTE Using RBW = 0.5 nm for measurement, you can extrapolate to the

result RBW = 1 nm by subtracting 3 dB (factor of 10 in the RBW gives 2x power = 3 dB)

Example: RBW = 0.5 nm results in: |SSE

RBW = 1 nm extrapolates to |SSE

1 nm

| = |SSE

| = 44.3dB measured

0.5 nm

|+ 3dB = 44.3 dB -

0.5 nm

3dB = 41.3 dB

94 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Performance Test Instructions Performance Tests

11 On the spectrum analyzer, set the Marker to the highest peak and

select delta. (Marker −> HIGHEST PEAK −> DELTA)

12 Using the MODIFY knob move the second marker to the highest

peak of the displayed side modes and note the difference, delta, between the two markers in the Test Record.

13 Increase the wavelength of the Tunable Laser by 10 nm as specified

in the Test Record.

14 Repeat steps 11 to 13 within the wavelength range of the Tunable

Laser.

Signal-to-Source Spontaneous Emission Tests - Low SSE Outputs

Follow this procedure to test modules with Low SSE high power outputs:

• Agilent 81480B, Output 1, Low SSE

• Agilent 81680B, Output 1, Low SSE

• Agilent 81640B, Output 1, Low SSE

The previous setup is limited by the dynamic range of the Optical Spectrum Analyzer. An improvement can be done by reducing the power of the spectral line of the Tunable Laser module by a filter, a Fiber Bragg Grating. However, by this approach, the measurement is limited to a single wavelength (that of the peak attenuation of the Fiber Bragg Grating):

Depending on the output connector option of your Tunable Laser module, the Device Under Test (DUT), the Fiber Bragg Grating should be connected with:

• a straight connector, if you use a TLS with option #071, or

• an angled connector, if you use a TLS with option #072.

NOTE Because the Tunable Laser channel displays the wavelength in air and

the Optical Spectrum Analyzer displays the wavelength in a vacuum there is a mismatch between the values displayed by the two instruments.

A good approximation in this wavelength range is:

= λ

OSA

Use λ accuracy of the Tunable Laser modules is better than the OSA.

The accuracy of the offset value in this equation does not influence the measurement accuracy of spectral and total SSE measurements.

Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition 95

as primary reference because the specified wavelength

TLS

− 0.5 nm

TLS

Performance Tests Performance Test Instructions

Figure 20 Transmission Characteristic of Fiber Bragg Grating

Figure 21 Signal-to-Spectral SSE Measurement

... λ

Lower Transmission Band

Upper Transmission Band

Attenuation Band

... λ

< 2 nm

1 Connect the Tunable Laser module (DUT) to the Optical Spectrum

Analyzer as shown in Figure 22. Connect one end of the Fiber Bragg Grating (FBG)

to Output 1, the Low SSE output, and the other to

the Optical Spectrum Analyzer.

81640B, 81680B: λ

81480B: λ

≈ 1407 nm

FBG

≈ 1520 nm

FBG

Set the menu parameters to the values shown in Table 4, “Tunable

Laser Channel Settings,” on page 75.

96 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Performance Test Instructions Performance Tests

Agilent 8164A/B Lightwave Measurement System

Optical Spectrum Analyzer

Tunable Laser

For #071: use 81000FI For #072: use 81000SI if the FBG has a DIN4108 connector and

use 81000NI if the FBG has a FC/APC connector

Fiber Bragg

Grating

Figure 22 Test Setup for Source Spontaneous Emission Test

2 Determine the filter transmission characteristics:

NOTE

is the nominal center wavelength of the FBG which is printed on

FBG

it, while

is the true measured value. Both are measured in vacuum

(reference is the TLS). In practise both values are the same, but you may find a difference of some pm.

Check center wavelength, λ

, of the Fiber Bragg Grating. This

FBG

wavelength is printed on its label, for example, 1520.5 nm. This value relates to measurements performed in a vacuum.

Set the Optical Spectrum Analyzer:

• Set the Span to 8 nm. Press Span and enter the value.

• Set the center wavelength to λ

the value.

• Set the reference level to 0 dBm. Press [AMPL], press [Ref LVL],

and enter the value.

• Set the Sensitivity to -68 dBm. Press [AMPL], press

[SENS AUTO MAN

], and enter the value.

• Set the resolution bandwidth to 0.1 nm. Press [BW Swp], and enter

the value.

Set the Tunable Laser module

• Set [λ], the wavelength, to λ

1520.5 nm − 1 nm = 1519.5 nm.

• Set [P], the output power, to the value in Table 17.

− 0.5 nm. Press Center and enter

FBG

− 1 nm, for example,

FBG

Table 17 Output Power Setting - Low SSE Output

Tunable Laser Module

Agilent 81480B - Output 1 -13

Power [P]

dBm

Agilent 81680B - Output 1 -6 dBm

Agilent 81640B - Output 1 -7 dBm

Press the key beside the laser output to switch on the laser output.

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Performance Tests Performance Test Instructions

– Check and note the peak power level displayed by the OSA and

the wavelength at the peak power. Press Peak Search in the Marker field.

–For λ

OSA at every 0.1 nm interval. That is, fill out the table shown in Table 18.

Table 18 Filter Transmission Characteristic

Tunable Laser Module Output

Wavelength Relative to λ

FBG

−1.0 nm dBm nm

−0.9 nm dBm nm

−0.8 nm dBm nm

−0.7 nm dBm nm

−0.6 nm dBm nm

−0.5 nm dBm nm

−0.4 nm dBm nm

−0.3 nm dBm nm

−0.2 nm dBm nm

−0.1 nm dBm nm

±0nm = λ

FBG

+0.1 nm dBm nm

+0.2 nm dBm nm

+0.3 nm dBm nm

+0.4 nm dBm nm

+0.5 nm dBm nm

+0.6 nm dBm nm

+0.7 nm dBm nm

+0.8 nm dBm nm

+0.9 nm dBm nm

+1.0 nm dBm nm

± 1 nm, check and note the power level displayed by the

FBG

Peak Power Level

Associated Wavelength Dis-

played on OSA

dBm nm

3 Determine minimum value of filter transmission and actual Fiber-

Bragg-Grating center wavelength, λ

– Check for minimum transmitted peak power in Table 18.

– Mark the associated wavelength set on the Tunable Laser,

TLS_λ0, and note the value in the test record.

– Mark the associated wavelength displayed on the OSA, OSA_λ0,

and note the value in the test record.

4 Set TLS to the wavelength of minimum transmission, TLS_λ0.

98 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Performance Test Instructions Performance Tests

5 Record spectrum at minimum filter transmission. Set the Optical

Spectrum Analyzer:

– Set the Sensitivity to -90 dBm.

– Set the resolution bandwidth to 0.5 nm.

– Set the center wavelength to OSA_λ0.

– Set the reference level to -40 dBm.

– Set the span to 6 nm.

6 Determine limits of transmission and attenuation ranges by

performing the following calculations:

– Lower Transmission Band:

λ1 ... λ

• TLS_λ1 = TLS_λ0 − 3nm

• TLS_λ2 = TLS_λ

= TLS_λ

– Upper Transmission Band: λ

− 0.5 × Attenuation Band

− 1nm

... λ

• TLS_λ3 = TLS_λ0 + 0.5 × Attenuation Band = TLS_λ0 + 1nm

• TLS_λ

= TLS_λ0 + 0.5 × Upper Transmission Band

= TLS_λ

+ 3nm

7 Determine maximum transmitted power value inside transmission

band:

Record spectrum: Check for the maximum transmitted power (max_SSE_power) within Lower and Upper Transmission Bands. Do this by using the marker. Change λ by using the RPG and note the maximum power value within the Lower and Upper Transmission Bands (this is one value for these bands together). Note this value in the test record. Check the associated wavelength on OSA (OSA@max_SSE_power) and note the value in the test record.

8 Set the marker of the OSA to OSA@max_SSE_power.

Change [λ], the output wavelength of the TLS, so that the peak wavelength of the spectrum is at the OSA marker

Change [λ], the output wavelength of the TLS, to the wavelength of highest SSE (TLS@max_SSE_power) using the approximation:

TLS@max_SSE_power = OSA@max_SSE_power + 0.5 nm

9 Determine TLS@max_SSE_power as follows:

Set the Optical Spectrum Analyzer:

– Set the Sensitivity to -68 dBm.

– Set the resolution bandwidth to 0.5 nm.

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Performance Tests Performance Test Instructions

– Set the center wavelength to OSA@max_SSE_power.

– Set the reference level to 0 dBm.

– Set the span to 6 nm.

– Record the spectrum.

10 Within the total spectrum, determine peak power,

power@SSE_peak, and note the absolute value |power@SSE_peak| in the test record.

NOTE This is at the wavelength the TLS is set to for this measurement and

the OSA measures, respectively.

11 Calculate spectral SSE by using the following equation:

Spectral SSE = |power@SSE_peak| – | max_SSE_power| + 3 [dB/nm])

Note the value in the test record.

NOTE The measurements were made with a resolution bandwidth of 0.5 nm.

The additional value of 3 dB takes care of a resolution of 1 nm, and so gives the SSE in [dB/nm]. (Factor of 10 in the RBW gives 2 x power = 3 dB).

Example:

RBW = 0.5 nm results in: |SSE

RBW = 1 nm extrapolates to |SSE

| = 44.3dB measured

0.5 nm

| = |SSE

1 nm

|+ 3dB = 44.3 dB -

0.5 nm

3dB = 41.3 dB

100 Agilent 81480B, 82B, and 81680B, 40B, 82B, 72B, & 42B Tunable Laser Modules User’s Guide, Second Edition

Agilent 81642B Users Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Safety Considerations

Safety Symbols

Initial Inspection

Line Power Requirements

Operating Environment

Input/Output Signals

Storage and Shipment

Initial Safety Information for Tunable Laser Modules

Laser Safety Labels

The Structure of this Manual

Conventions used in this manual

Tab l e of C ont e nts

List of Figures

Overview of Tunable Laser Sources

What is a Tunable Laser?

Optical Output

Polarization Maintaining Fiber

Angled and Straight Contact Connectors

Signal Input and Output

Accessories

Modules and Options

Modules

User’s Guides

Options

Connector Interfaces and Other Accessories

Option 071: Straight Contact Connector

Option 072: Angled Contact Connector

Specifications

Definition of Terms

Static Conditions

Dynamic Conditions

Tunable Laser Module Specifications

Supplementary Performance Characteristics

Operating Modes

General

Environmental

Performance Tests

Required Test Equipment

Test Reco rd

Test Failure

Instrument Specification

Performance Test Instructions

General Test Setup

Wavelength Tests

Wavelength Accuracy

Wavelength Repeatability

Power Tests

Power Linearity

Power Flatness over Wavelength

Power Stability

Signal-to-Source Spontaneous Emission