Agilent 81619A User Manual

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Agilent 81618A/9A Optical Head Interface Modules and Agilent 81623B/4B/6B/8B Optical Heads

User’s Guide

Agilent Technologies

Notices

No part of this manual may be reproduced in any form or by any means (including electronic storage and retrieval or tr ansl at ion int o a fo rei gn lan gu age ) w itho ut prior agreement and written consent from Agilent Technologies, Inc. as governed by United States and international copyright laws.

Agilent Technologies, Deutschland GmbH Herrenberger Straße 130 71034 Böblingen, Germany.

Manual Part Number

81623-90B12

Edition

Fourth edition April 2005

Third edition, July 2002

Second edition, January 2002

First edition, July 2001

Subject Matter

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

Agilent Technologies makes no

warranty of any kind with regard to this printed material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.

Agilent Technologies shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, 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 changes 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.

Warranty

This Agilent Technologies instrument produ ct i s wa rra nte d ag ain st d efe cts in material and workmanship for a period of one year from date of shipment. During the warranty period, Agilent will, at its option, 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, unauthorized modification or misuse, operation outside 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.

Exclusive Remedies

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

Assistance

Product maintenance agreements and other customer assistance agreements are available 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 Standards and Technology, NIST (formerly the United States National Bureau of Standards, NBS) to the extent allowe d 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 system standard as part of our objective of continually increasing customer satisfaction through improved process control.

Agilent Technologies Sales and Service Offices

For more information about Agilent Technologies test and measurement products, applications, services, and for a current sales office listing, viesit our web site:

http://www.agilent.com/comms/lightwave

You can also contact one of the following centers and ask for a test and measurement sales representative.

United States: 1 800 829 4444

1 800 829 4433 (FAX)

Canada: 1 877 894 4414

1 800 746 4866 (FAX)

Europe: +31 20 547 2111

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800 142 134 (FAX)

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Latin America +55 11 4197 3600

+55 11 4197 3800 (FAX)

Ta b l e o f Co ntents

Getting Started with Optical Heads 9

Safety Considerations 10

Safety Symbols 10

Input Power Limitations 11

Initial Inspection 11 Line Power Requirements 11 Operating Environment 12 Storage and Shipment 12

What is an Optical Head? 13

Analog Output 15 Optical input 15 Heat Sink for 81628B optical Head 16 Attaching the heat sink to the 81628B Optical Head 16

Applicable adapters 16

Mounting Instructions 17

Accessories 19

Modules and Options 20

Connector Adapters - Reference List 22

Specifications 23

Definition of Terms 24

Linearity 24 Averaging Time 25 Linewidth 25 Noise 25 Reference conditions 25 Power range 26 Wavelength range 26 Relative uncertainty (spectral ripple) due to interference 26 Relative uncertainty due to speckle noise 27 Relative uncertainty due to polarization 27 Return loss 28 Spectral width of optical source 28

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Total uncertainty 28 Uncertainty at reference conditions 28

Optical Head Specifications 29 Supplementary Performance Characteristics 35

Analog Output 35

Performance Tests 37

Equipment Required 38 Te st R e c ord 40 Test Failure 41 Instrument Specification 42 Functional Tests 43 Performance Tests 44

For 81628B only 45 Accuracy Test 46 Linearity Test 48

Test S e t u p 49 +10 dBm Range (equivalent to +40 dBm range for 81628B) 50

Calculation 54

Noise Test 57 Return Loss Test 58 Relative Uncertainty due to Polarization (Optional Test) 60 Relative Uncertainty due to Interference (Optional Test) 62 Calculation Sheets 78

Cleaning Information 81

Cleaning Instructions for this Device 82

81000xA Optical Head Adapters 82 8162xx Optical Power Heads 82

Safety Precautions 83 Why is it important to clean optical devices? 84 What do I need for proper cleaning? 85

Standard Cleaning Equipment 85

Dust and shutter caps 85

Isopropyl alcohol 86 Cotton swabs 86 Soft tissues 87

6 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Pipe cleaner 87

Compressed air 88

Additional Cleaning Equipment 89

Microscope with a magnification range about 50X up to 300X 89 Ultrasonic bath 89 Warm water and liquid soap 90

Premoistened cleaning wipes 90 Polymer film 90 Infrared Sensor Card 90

Preserving Connectors 91 Cleaning Instrument Housings 92 Which Cleaning Procedure should I use ? 93

How to clean connectors 94 How to clean connector adapters 96 How to clean connector interfaces 97 How to clean bare fiber adapters 98 How to clean lenses 99 How to clean instruments with a fixed connector interface 100 How to clean instruments with an optical glass plate 100 How to clean instruments with a physical contact interface 101 How to clean instruments with a recessed lens interface 102 How to clean optical devices which are sensitive to mechanical

stress and pressure 103 How to clean metal filters or attenuator gratings 104

Additional Cleaning Information 105

How to clean bare fiber ends 105 How to clean large area lenses and mirrors 106

Other Cleaning Hints 108

Index 109

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

8 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Getting Started with Optical Heads

This chapter introduces the features of the Agilent 81623B/4B/6B/8B Optical Heads.

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Input Power Limitations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Line Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Operating Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Storage and Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

What is an Optical Head? . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Optical input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Heat Sink for 81628B optical Head . . . . . . . . . . . . . . . . . . . . . . . 16

Attaching the heat sink to the 81628B Optical Head . . . . . . . .16

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Getting Started with Optical Heads Safety Considerations

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.

CAUTIONWARNING

CAUTION

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.

A CAUTION notice denotes a hazard. It calls attention to an operating procedure, practice, or the like that, if not correctly performed or adhered to, could result in damage to the product or loss of important data. Do not proceed beyond a CAUTION notice 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.

Caution - hot surface.

Magnetic fields - may interfere with a pacemaker.

10 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Safety Considerations Getting Started with Optical Heads

Input Power Limitations

CAUTIONWARNING

Applicable to Agilent 81628B only -

Operation above 34 dBm (2.51 W) is at your own risk.

Operation at a continuous optical power, or an average optical power, greater than 34 dBm causes, in the specified operating temperature range, the metal parts (connector adapters, screws) to become hotter than the required limit (55°C) of the safety standard IEC 61010-1.

Agilent Technologies Deutschland GmbH will not be liable for any damage caused by operation above 34 dBm.

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.

CAUTIONWARNING

To avoid hazardous electrical shock, do not perform electrical tests when there are signs of shipping damage to any portion of the outer enclosure (covers, panels, etc.).

Line Power Requirements

The Agilent 81618A and Agilent 81619A Optical Head Interface Modules operate when installed in the Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement System, and Agilent 8166A Lightwave Multichannel System.

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Getting Started with Optical Heads Safety Considerations

Operating Environment

The safety information in the Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement System, and Agilent 8166A Lightwave Multichannel System User’s Guide summarizes the operating ranges for the Agilent 81618A and Agilent 81619A Optical Head Interface Modules. In order for these modules to meet specifications, the operating environment must be within the limits specified for the Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement System, and Agilent 8166A Lightwave Multichannel System.

Storage and Shipment

This module can be stored or shipped at temperatures between

−40°C and +70°C. Prote ct the module from tem perature extremes that ma y cause condensation within it.

12 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

What is an Optical Head? Getting Started with Optical Heads

What is an Optical Head?

An optical head measures the power emitted from a connected singlemode or multi-mode fiber or the power applied in an open parallel beam (with max. 5 mm diameter). The wavelength and power range depends on the sensor element.

Screw to connector adapter when fitted

Cable to interface module

Analog output

Figure 1 Rear view of an Optical Head with Analog Output

Optical interface

connector adapter locking screws

Figure 2 Front View of Optical Head without Adapter

Figure 1 and Figure 2 show views of a typical optical head.

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Getting Started with Optical Heads What is an Optical Head?

Figure 3 shows two types of adapter that are available for connecting the input fiber to an optical head

Threaded connector adaptor:

81000xA, 81000BT

Figure 3 Connector adapters

D-type magnetic connector adaptor:

(preferred) 81003xx 81001xx

81000BC

14 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

What is an Optical Head? Getting Started with Optical Heads

Analog Output

The analog output is the BNC connector on the back of the optical head. It outputs a voltage directly proportional to the strength of the optical signal at the optical input in the current range. The analog signal is always in the range between 0 and 2V, 2V corresponding to a full power input signal in the current range, 0V corresponding to no input signal.

During autoranging, the level to which 2V corresponds changes. You should disable autoranging when using the analog output.

Disabling Autoranging

Select the best range for the application using the mainframes user interface. Select <Menu>, <Range Mode>, <Manual> and then choose from the list of ranges.

Applications

Possible applications for the analog output are:

• to close the feedback loop controlling the current supplied to a laser

• to aid positioning the system for fiber alignment tasks

• to monitor optical power on an oscilloscope

The analog signal reacts instantaneously to the input signal, whereas the power shown on the display is subject to averaging.

Optical input

The optical input to the optical head requires a connector adapter to match the connector type (or bare fiber) to the optical head interface.

The optical head interface can be either threaded or a D-type magnetic interface depending on the model of optical head (81628B is only available with a threaded interface). See “Accessories” on page 19 for details of the connector adapters available.

When a connector adapter is fitted it should be locked in place by tightening the locking screws located either side of the main optical head housing.

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Getting Started with Optical Heads What is an Optical Head?

Heat Sink for 81628B optical Head

The 81628B optical head has a heat sink that allows an extended operating power range. This heat sink must be mounted on the integrating sphere for operation from 34 dBm to 38 dBm.

Attaching the heat sink to the 81628B Optical Head

NOTE

Always attach the heat sink and rubber ring to the 81628B if operating at an optical power higher than 34dBm!

Applicable adapters

Agilent adapters types 81000xx, 81000BT are applicable to the 81628B with the heat sink attached (without the heatsink and up to 34dBm the 81000BT bare fiber adapter may be attached). Bare fibers are not intended to be used in high power applications.

If shipping the 81628B high power optical head please detach the heatsink from the optical head to avoid damage during transportation.

16 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

What is an Optical Head? Getting Started with Optical Heads

Mounting Instructions

1 Check that the blue rubber ring is correctly attached to the integrating

sphere and covers the metallic screws as shown in Figure 4 .

Figure 4 Attaching the Rubber Ring

The heatsink consists of two conical metal parts, the bottom part (smallest diameter at the bottom), and the top part (largest diameter at top). Slide the bottom part of the heat sink over the throat of the integrating sphere with the smallest diameter facing to the sphere. Then screw on the desired adapter (81000xx series) to the sphere as shown in Figure 5 .

Figure 5 Attaching the Bottom Part of the Heat Sink

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Getting Started with Optical Heads What is an Optical Head?

Attach the upper part of the heat sink to the integrating sphere. Slide the

upper part over the connector adapter with the largest diameter facing opposite to the sphere. Tighten the screws with the Allen key enclosed in the Heat Sink Kit (see Figure 6 ).

Figure 6 Attaching the Upper Part of the Heat Sink

18 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Accessories

The Agilent 81618A/9A Optical Head Interface Modules and Agilent 81623B/4B/6B/8B Optical Heads 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.

Modules and Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Optical Heads (5mm Sensors) . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Connector Adapters - Reference List. . . . . . . . . . . . . . . . . . . . . .22

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Accessories Modules and Options

Modules and Options

Optical Heads (5mm Sensors)

Accessories

81624CE 4 m extension cable

Interface Module

High Power

Optical Head for:

Connectorized Fiber,

Bare Fiber and

Open beam NA ≤ 0.3

81628B InGaAs

+40 dBm to –60 dBm

Connector Adapters

(threaded).

Interface Modules

81618A Single Head Interface Module

81619A Dual Head Interface Module

Connector Adapters (threaded)

81000BT Bare Fiber Connectivity Set (Threaded) 81000FA FC/PC/APC 81000KA SC/PC/APC 81000VA ST 81003LA LC 81000PA E-2000

20 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Modules and Options Accessories

High Power Optical Head (with integrating sphere)

Interface M odule

High Power

Optical Head for:

Connectoriz ed Fiber,

Accessories

81624CE 4 m extension cab le

Bare Fiber and

Open beam NA ≤ 0.3

81628B InGaAs

+40 dBm to –60 dBm

Connector Ad apters

(threaded).

OPTIONAL

Interface Modules

81618A Single Head Inte rface Module

81619A Dual Head Interfac e Module

Connector Adapters (threaded)

81000BT Bare Fibe r Connectivity Set (Threaded) 81000FA FC/PC/ APC 81000KA SC/PC/APC 81000VA ST 81003LA LC 81000PA E-2000

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Accessories Modules and Options

Connector Adapters - Reference List

Table 1 Connector Adapters

Preferred Adapters

Integral D-shape for 5 mm

Connector Type Threaded Version

Barefiber 81000BT 81000BC

FC/PC 81000FA 81001FA

SC/PC 81000KA 81001KA

MU 81001MA

E-2000 81000PA 81001PA

ST 81000VA

blank 81001ZA

LC 810003LA 810001LA

MTP(ribbon) 81003TD

optical heads

22 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Specifications

The Agilent 81618A/9A Optical Head Interface Modules and Agilent 81623B/4B/6B/8B Optical Heads 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’ and heads’ warranted performance. Supplementary performance characteristics describe the modules’ and heads’ non-warranted typical performance.

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

Definition of Terms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Linearity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Averaging Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Linewidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Noise. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Reference conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Power range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Wavelength range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Relative uncertainty (spectral ripple) due to interference . . . . 26

Relative uncertainty due to speckle noise . . . . . . . . . . . . . . . . .27

Relative uncertainty due to polarization . . . . . . . . . . . . . . . . . . .27

Return loss. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Spectral width of optical source. . . . . . . . . . . . . . . . . . . . . . . . . .28

Total uncertainty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Uncertainty at reference conditions . . . . . . . . . . . . . . . . . . . . . . 28

Optical Head Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 29

Supplementary Performance Characteristics . . . . . . . . . .35

Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Specifications Definition of Terms

Definition of Terms

This section defines terms that are used both in this chapter and “Performance Tests” on page 37.

Generally, all specifications apply for the given environmental conditions and after warmup time.

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

Linearity

The linearity error is defined as the relative difference between the displayed power ratio, D caused by changing the displayed power level from the reference level, D to an arbitrary displayed level, D

if expressed in %

, and the actual (true) power ratio Px/P0

x/D0

. Symbol N.

⁄

xD0



------ ------- ----- 1Ð



⁄

xP0

100()=

if expressed in dB

⁄

xD0



log=

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



⁄

xP0

Conditions: reference level 10 µW, displayed power levels within the

specified range, zero less than specified time prior to measurement.

Note 1: ideally N = 0 %, respectively 0 dB.

Note 2: the power-dependent nonlinearity, N(P

), can alternatively be

expressed by the following formula:

()rP0()Ð

()

------ ------ ---- ----- ------ ---- -----=

()

where r(P) is the power-dependent responsivity (for a power meter, the responsivity is defined as the ratio of displayed power to actual input power).

24 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Definition of Terms Specifications

Averaging Time

Time defining the period during which the power meter takes readings for averaging. At the end of the averaging time the average of the readings is available (display- or memory-update). Symbol T

avg

Linewidth

FWHM spectral bandwidth. The 3 dB width of the optical spectrum, expressed in Hertz. Symbol: ∆f.

Noise

The peak-to-peak change of displayed power level with zero input power level (dark).

Conditions: Zero prior to measurement, averaging time and observation time as specified, lowest power range selected and wavelength range as specified.

Measurement: the measurement result is obtained by:

− P

Noise = P

max

expressed as peak-to-peak within

min

the given time span. Any offset is automatically excluded this way.

Reference conditions

The specified conditions during the spectral responsivity calibration, or conditions which are extrapolated from the conditions during calibration.

Conditions: power level, beam diameter or fiber type, numerical aperture, wavelength, spectral width, ambient temperature as specified, at the day of calibration. →Noise and drift observed over a specified observation time, with a temperature change of not more than ±∆T.

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Specifications Definition of Terms

Power range

The power range is defined from the highest specified input power level to the smallest input power level that causes a noticeable change of displayed power level.

Conditions: wavelength, averaging time as specified.

Wavelength range

The range of wavelengths for which the power meter is calibrated.

Note: Selectable wavelength setting of the power meter for useful power measurements (operating wavelength range).

Literature

[1]Fiber optic test and measurement, Hewlett Packard Professional Books, edited by Prentice Hall, ISBN 0-13-534330-5

Relative uncertainty (spectral ripple) due to interference

Uncertainty of power reading when using a coherent source, due to a periodic change of the power meter's responsivity caused by optical interference between reflective interfaces within the power meter's optical assembly.

Conditions: constant wavelength, constant power level, angled connector as specified, linewidth of source <100 MHz, temperature as specified.

NOTE

26 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Spectral ripple is measured by stepping the source wavelength over the wavelength range specified.

Definition of Terms Specifications

Relative uncertainty due to speckle noise

This is the uncertainty of the power reading when using a coherent source. This is due to a variation of the power meters responsivity caused by optical interference meters optical assembly.

Conditions: constant wavelength, constant power level, angled connector as specified, linewidth of source as specified, temperature as specified.

Incoming light to the integrating sphere undergoes numerous internal reflections (as many as several hundred) prior to hitting the detector. If the source is sufficiently coherent, a complicated interference pattern (speckle pattern) appears spread over the whole sphere volume. Slight changes of the ambient conditions (temperature, vibration, shock) affect particular optical paths which consequently changes the speckle pattern and results in an instability of the head power reading (speckle noise).

between different optical paths within the power

NOTE

Changes in the source wavelength have a similar effect on speckle noise as environmental changes, because they cause fluctuations in the interference pattern. If the source coherence length is small compared to the effective path length, the interference pattern disappears and relative uncertainty due to speckle noise becomes negligible.

Measurement: In contrast to the spectral ripple definition the source wavelength isn’t stepped when measuring speckle noise.

Relative uncertainty due to polarization

Also termed polarization-dependent responsivity (PDR), the relative uncertainty due to polarization is the uncertainty of the displayed power level on the input polarization state, expressed as the difference between the highest and the lowest displayed power. Uncertainty figures are based upon a 95% confidence level.

Conditions: laser source with variable polarization state, generation of all possible polarization states (covering the entire Poincaré sphere), constant wavelength, constant power level, angled connector as specified, temperature as specified.

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Specifications Definition of Terms

Return loss

The ratio of the incident power to the reflected power expressed in dB. Symbol: RL.



RL 10

Conditions: the return loss excludes any reflections from the fiber end

used as radiation source.

log=

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



back

Spectral width of optical source

Full width at half maximum. The 3 dB width of the optical spectrum, expressed in nm. Symbol: FWHM.

To ta l u nc e rt ai nt y

The uncertainty for a specified set of operating conditions, including noise and drift.

Conditions: power level, beam diameter or fiber type, numerical aperture, wavelength, spectral width, ambient temperature, re-calibration period as specified. →Noise and drift observed over a specified observation time, with a temperature change of not more than ±∆T.

Uncertainty at reference conditions

The uncertainty for the specified set of reference conditions, including all uncertainties in the calibration chain from the national laboratory to the test meter.

28 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Optical Head Specifications Specifications

Optical Head Specifications

All optical heads have to be operated with the single (Agilent 81618A) or dual

(Agilent 81619A) Interface Modules.

Table 2 Optical Head Specifications

Agilent 81623B

Sensor element Ge, ∅ 5 mm

Wavelength range 750 nm to 1800 nm

Power range –

Applicable fiber type

Open beam

Uncertainty at reference conditions [1]

Total uncertainty [2], [9]

Relative uncertainty:

- due to polarization [3]

- spectral ripple

± 2.2 % (1000 nm to 1650 nm)

± 3.0 % (800 nm to 1000 nm)

± 3.5% ± 100 pW (1000 nm to 1650 nm)

± 4.0% ± 250 pW (800 nm to 1000 nm)

Standard SM and MM max 100 µm core size, NA ≤ 0.3

Calibration option C85 / C86

80 dBm to +10 dBm

Parallel beam max ∅ 4 mm

± 2.2 % (1000 nm to 1650 nm)

± 2.5 % (800 nm to 1000 nm)

± 3.5% ± 100 pW (1000 nm to 1650 nm)

± 3.5% ± 250 pW (800 nm to 1000 nm)

[10]

< ± 0.01 dB

< ± 0.006 dB (typ. < ± 0.003 dB)

(typ. < ± 0.005 dB)

Agilent 81623B

Calibration option C01 / C02

± 1.7 % (1000 nm to 1650 nm)

± 3.0 % (800 nm to 1000 nm)

± 3.0% ± 100 pW (1000 nm to 1650 nm)

± 4.0% ± 250 pW (800 nm to 1000 nm)

(due to interference) [4]

Linearity (power): [5]

at 23°C ±5°C

at operating temp. range

Return loss [7] > 50 dB, typ. > 55 dB

Noise (peak to peak) [6]

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

(CW –60 dBm to +10 dBm)

< ± 0.025 dB

[8]

< 100 pW (1200 nm to 1630 nm)

< 400 pW (800 nm to 1200 nm)

[9]

< ± 0.05 dB

> 56 dB

Specifications Optical Head Specifications

Averaging time (mini-

100 µs

mal)

Analog Output included

Dimensions 57 mm x 66 mm x 156 mm

Weight 0.5 kg

Recommended recali-

2 years

bration period

Operating temperature 0°C to 40°C

Humidity Non-condensing

Warm-up time 40 min

[1]

Reference conditions:

• Power level 10 µW ( -20 dBm), continuous wave (CW)

• Parallel beam, 3 mm spot diameter on the center of the detector

• Ambient temperature 23°C ± 5°C

• On day of calibration (add ± 0.3% for aging over one year, add ± 0.6% over two years)

• Spectral width of source < 10 nm (FWHM)

• Wavelength setting at power sensor must correspond to source wavelength ± 0.4nm

[2]

Operating Conditions:

• P aral lel beam , 3m m sp ot d iame te r on the c ent er o f th e de tect or o r co nnec tor ized fib er w ith NA ≤ 0 .2 ( stra igh t

connector)

•Averaging time 1s

• For NA > 0.2: add 1%

• Within one year after calibration, add 0.3 % for second year

• Spectral width of source < 10 nm (FWHM)

• Wavelength setting at power sensor must correspond to source wavelength ± 0.4nm

[3]

All states of polarization at constant wavelength (1550 nm ± 30 nm) and straight connector, T = 23°C ± 5°C.

For angled connector (8 û ) add 0.01 dB typ.

[4] Conditions:

• Wavelength 1550 nm ± 30 nm, fixed state of polarization

• Temperature 23°C± 5°C

•Linewidth of source ÷ 100 M Hz

• Angled connector 8°

[5]

Does not include noise; for wavelength < 1000 nm applies for Ð 50dBm to + 10 dBm

[6]

Averaging time 1 s, T = 23°C ± 5°C, ∆T± 1°C, observa tion tim e 300 s.

[7]

Conditions:

Wavelengths 1550 nm ± 30 nm. Standard single mode fiber, angled connector min 8°

[8]

With D-shape adapter 81001x x

Return Loss: > 60 dB typical

[9]

For input power > 2 mW

add ± 0.004 dB / mW; zeroing required

[10]

Specif ication vali d for opti cal heads with

S/N starting with “DE413…” (shipping began April 1, 2001)

30 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Optical Head Specifications Specifications

Table 3 High Power Optical Head Specifications

Sensor element

Wavelength range

Power range

Applicable fiber type

Open beam

Uncertainty at refer

ence conditions

Total uncertainty

[2] ± 3.5% ± 5 pW

[1]

Agilent 81624B

Calibration option

Agilent 81624B

C01 / C02

InGaAs, ∅ 5 mm InGaAs, ∅ 5mm

800 nm to 1700 nm 850 nm to 1650nm

–90 dBm to +10 dBm –70 to +27 dBm (1250 nm to 1650 nm)

Standard SM and MM max 100 µm core size,

NA ≤ 0.3

Parallel beam max ∅ 4 mm

± 2.2 %

(1000nm to 1630 nm)

± 1.5 %

(970 nm to 1630 nm)

± 2.8% ± 5 pW

(1000nm to 1630 nm)

(970 nm to 1630 nm)

Agilent 81626B

Calibration option

Agilent 81626B

C01 / C02

–70 to +23 dBm (850 nm to 1650 nm)

Standard SM and MM max 100 µm core size,

NA ≤ 0.3

Parallel beam max ∅ 4 mm

± 3.0 %

(950 nm to 1630 nm)

± 5.0% ± 500 pW

[8]

(950 nm to 1630 nm)

± 2.5 %

(950 nm to 1630 nm)

± 4.5% ± 500 pW

(950 to 1630 nm max

23 dBm)

(1250 to 1630 nm

max 27 dBm)

[8]

Relative uncertainty:

- due to polarization

[3]

- spectral ripple (due to interference)

[4]

Linearity (power):

- at 23 ûC ±5ûC

- at operat. temp. range

Return loss

Noise (peak to peak)

Averaging time (min.)

Analog Output

Dimensions

Weight

Recommended recali

bration period

[5]

[7]

≤ ± 0.005 dB (typ. ± 0.002 dB)

≤ ± 0.005 dB (typ < ± 0.002 dB)

CW –70 dBm to +10 dBm, 1000 nm to 1630 nm

< ± 0.02 dB

< ± 0.05 dB

CW – 50 dBm to + 27dBm, 950 nm to 1630 nm

≤ ± 0.005 dB (typ. ± 0.002 dB)

≤ ± 0.005 dB (typ. < ± 0.002 dB)

< ± 0.04 dB

< ± 0.15 dB

typ. 60 dB > 45 dB > 47 dB

[6] < 5 pW < 500 pW

100 µs 100 µs

included Included

57 mm x 66 mm x 156 mm 57 mm x 66 mm x 156 mm

0.5 kg 0.5 kg

2 years 2 years

[8]

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Specifications Optical Head Specifications

Operating temperature

Humidity

Warm-up time

0°C to 40°C 0°C to +35°C

[9]

Non-condensing Non-condensing

40 min 40 min

[1]

Reference conditions:

• Power level 10 µW (-20 dBm), continuous wave (CW)

• Parallel beam, 3 mm spot diameter on the center of the detector

• Ambient temperature 23°C ± 5°C

• On day of calibration (add ± 0.3% foraging over one year, add ± 0.6% over two years)

• Spectral width of source < 10 nm (FWHM)

• Wavelength setting at power sensor must correspond to source wavelength ± 0.4nm

[2]

Operating Conditions:

• Parallel beam, 3mm spot di ameter on the center of the detector or connectorized fiber with NA ≤0.2 (straight connector)

•Averaging time 1s

• For NA > 0.2: add 1%.

• Within one year after calibration, add 0.3 % for second year.

•Zeroing required

[3]

All state s of polar ization at constant wavelength (155 0 nm ± 30 nm),

straight connector, T = 23°C ± 5°C. For angled connector (8 û ) add 0.01 dB typ.

[4]

Conditions:

• Wavelength 1550 nm ± 30 nm, fixed state of pol arization

• Temperature 23°C ± 5°C

•Linewidth of source ≥100 MHz

• Angled connector 8°

[5]

Does not include noise;

zeroing required

[6]

Averagin g time 1s, T = 23°C ± 5°C, ∆T ± 1°C, observation time 300 s.

Wavelength range 1200 nm to 1630nm

[7]

Conditions:

• Wavelengths 1550nm ± 30 nm

• Standard single mode fiber, angled connector min 8°

• With D-shape adapter 81001xx Return Loss > 60 dB typica l

[8]

For input power > + 10 mW add: add typ. ± 0.0016 dB/mW In case of negative power change > 50 dB allow additional recovery time of 3 min

[9]

Max 30°C for > + 20 dBm input power

32 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Optical Head Specifications Specifications

Table 4 Agilent 81628B Specification

Agilent 81628B

with integrating sphere

Sensor element InGaAs

Wavelength range 800 nm to 1700 nm

Power range –

60 dBm to +40 dBm (800 nm to 1700 nm)

For operation higher than 34 dBm see safety note

Damage Power 40.5 dBm

Applicable fiber type

Open beam

Uncertainty at reference conditions

Total uncertainty

[1] [8]

[2] [8]

≤ 10 dBm

>10 dBm to ≤ 20 dBm

>20 dBm to ≤ 38 dBm

Single mode NA ≤ 0.2, Multimode NA ≤ 0.4 ∅ ≤ 3mm center of sphere

± 3.0 % (970 nm to 1630nm)

(970 nm to 1630nm)

± 4.0% ± 5 nW

± 4.5%

± 5%

Relative uncertainty:

[3]

- due to polarization

typ. ≤ ± 0.006 dB

- due to speckle noise at

source linewidth:

[4]

typ. ≤ ± 0.02 dB

0.1pm to 100pm >100pm

Linearity (power):

[5] [8]

≤ 10 dBm

>10 dBm to ≤ 20 dBm

>20 dBm to ≤ 37 dBm

>37 dBm to ≤ 38 dBm

Return loss

Noise (peak to peak)

[6]

Averaging time (minimal) 100 µs

Analog Output Included

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

typ. ≤ ± 0.002 dB

(CW –40 dBm to + 38 dBm), (970 nm to 1630 nm)

≤ ± 0.03 dB

≤ ± 0.06 dB

≤ ± 0.09 dB

≤ ± 0.10 dB

at 23°C ± 5°C, for operating temperature range add ±0.03 dB

typ. > 75 dB

< 5 nW

Specifications Optical Head Specifications

Dimensions 55mm x 80 mm x 250 mm

Weight 0.9 kg (without heat sink)

Recommended Recalibra-

2 years

tion period

Operating temperature

[7]

0°C to +40°C

Humidity Non-condensing

Warm-up time 40 min

Reference conditi ons:

[1]

Power lev el 10 µW (-20 dBm), continuous wave (CW)

•Averaging time 1s

• Parallel beam, 3 mm, center of sphere input

• Ambient tempe rature 23 °C ± 5 °C

• On day of calibration (add ± 0.3 % for aging over one year, add ± 0.6 % over two years)

• Spectral width of source <10 nm (FWHM)

• Wavelength setting at power sensor must correspond to source wavelength ± 0.4 nm

• Humidity 50 % ± 10 %

[2]

Operating Conditions:

• Parallel beam, ∅ 3mm , center of sphere input, or connectorized fiber with NA ≤0.2 (straight connector)

• For NA > 0.2: add 1%

• Within one year after calibration, add ± 0.3% for second year

• Operating temperature range as specified, humidity <80% and non-condensing

•Zeroing required

[3]

All stat es of polar ization at constant wavelength (1550 nm ± 30 nm) and co nstant power

[4]

Conditions:

• Wavelength 1550 nm ± 30 nm, fixed state of polarization, constant power

• Temperature 23°C ± 5°C Measurement time ≤ 3 min

[5]

Does not include noise;

zeroing required

[6]

Averagin g time 1s, T = 23°C ± 5 °C,

∆T ± 1°C, observa tion tim e 300 s, wavelength ran ge 970 nm to 1630 nm

Thermal drift at 38 dBm, exposure time 30 min: Recovery time 10 min: ≤ 30nW 30 m in: ≤ 10nW

[7]

For optical power > 30 dBm the maximal opera ting temperature is limited to 35°C

[8]

Wavelength must not be equal to any water absorption line

Safety Note:

For optical power higher than 34 dBm the attached heat sink MUST be used! For continuous optical power or average optical power higher than 38 dBm the connector adapters will get warmer than permitted according to the safety standard IEC 61010-1. The 81628B Optical Head can handle optical power up to 40 dBm, however, operation above 38 dBm is at the operators own risk. Agilent Technologies Deutschland GmbH will not be liable for any damages caused by an operation above 38 dBm.

34 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Supplementary Performance Characteristics Specifications

Supplementary Performance Characteristics

Analog Output

Bandwith ≥DC, ≤300 to 5000 Hz depending on range and optical head. Output voltage 0 to 2 V non-terminated Output impedance 600 Ohm typ. Max. input voltage ±10V

Table 5 3dB-bandwidth of the Analog Output

Bandwidth

Range

+40 dBm N/A N/A 3.5 kHz

+30 dBm N/A N/A 3.5 kHz

+20 dBm N/A N/A 3.5 kHz

+10dBm 5.0kHz 5.0kHz 3.5kHz

0dBm 5.0kHz 5.0kHz 1.8kHz

-10dBm 5.0kHz 5.0kHz 1.8kHz

-20dBm 5.0kHz 5.0kHz 0.12kHz

-30dBm 0.5kHz 1.8kHz 0.12kHz

-40dBm 0.5kHz

-50 dBm 0.05 kHz

-60 dBm 0.05 kHz

[1]

Not applicable for 81626B

[2]

Not applicable for 81622B

81622B/3B

[2]

Bandwidth

81624B/6B/7B

1.8 kHz N/A

0.12 kHz

[1]

Bandwidth

81628B

N/A

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Specifications Supplementary Performance Characteristics

36 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests

The procedures in this section test the performance of the instrument. The complete specifications to which Agilent 81623B/4B/6B/8B Optical Heads are tested are given in “Specifications” on page 23. All tests can be performed without access to the interior of the instrument. The test equipment given corresponds to tests carried out with Diamond HMS - 10 connectors.

Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Tes t R e c ord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

Test Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Instrument Specification. . . . . . . . . . . . . . . . . . . . . . . . . . . .42

Functional Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

For 81628B only. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Accuracy Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Linearity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Noise Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

Return Loss Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

Relative Uncertainty due to Polarization (Optional Test) . . . . . 60

Relative Uncertainty due to Interference (Optional Test) . . . . . 62

Calculation Sheets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Equipment Required

Equipment Required

Equipment required for the performance test is listed in the table below. Any equipment that satisfies the critical specifications of the equipment given in the table may be substituted for the recommended models.

Table 6 Equipment Required for Performance Test

Interface Optical Head

Instrument/Accessory Recommended Model

81618A

81619A

81623B

81624B

81626B

81628B

Multimeter Mainframe Agilent 8163A/B 1 ea 1 ea 2 ea 2 ea 2 ea 2 ea Agilent

Interface Module Agilent 81618A ––xxxx Agilent

Optical Head 8162x 1 ea 2 ea – – – – CW Laser Module Agilent 81657A ––xxxx CW Laser Module Agilent 81654A – xxxx Agilent

Power Meter Standard Agilent 81618A Optical

Head Interface Module with Agilent 81623B #C01

Power Meter Standard Agilent 81618A Optical

Head Interface Module with

Agilent 81624B #C01 Power Sensor ModuleAgilent 81634B ––xxxx Optical Attenuator Agilent 8156A #221 ––xxxx Optical Attenuator Agilent 8156A #101 ––xxxx Return Loss

Reference Cable Return Loss ModuleAgilent 81613A ––xxxx Kit, Performance Test 81628-68705 – – – – – x Tunable Laser Source Agilent 8164A and

Polarization Controller Agilent 11896A #025 – – – o o o Wavelength Independent Coupler (3 dB) Best IF Adapter Special Tool – – – o o o Worst IF Adapter Special Tool – – – o o o

Agilent 81610CC ––xxxx

Agilent 81680A #022

Special Tool – – – o o o

––x–––

–––xxx

–––ooo

Alterna-

tive

Models

Required

Characteristics

8164A/B

81619A

81657A

Singlemode Fiber Agilent 81101AC (2/1* ea)––xxxx

Legend : – not applicable; x necessary; o optional.

38 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Equipment Required Performance Tests

Table 6 Equipment Required for Performance Test

Interface Optical Head

Instrument/Accessory Recommended Model

81618A

81619A

81623B

81624B

81626B

81628B

Agilent 81101PC (1 ea) –––––– Agilent 81102SC (1 ea) – – – – – x Agilent 81113PC (3 ea) ––xxxx Agilent 81113SC (1 ea) ––xxxx

Connector Adapters Agilent 81000AA (2 ea) ––xxxx

Agilent 81000SA (1 ea) ––xxxx Agilent 81001SA (1 ea) –––––– Agilent 81000FA (1/2* ea)––xxxx Agilent 81001FA (1 ea) ––––––

Connector InterfacesAgilent 81000AI (3 ea) ––xxxx

Agilent 81000FI (3 ea) ––xxxx Agilent 81000SI (4 ea) ––xxxx

Plastic Cap PN 5040-9351 ––xxxx

Legend : – not applicable; x necessary; o optional.

Alterna-

tive

Models

Required

Characteristics

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Tes t R ec o r d

Test Record

Results of the performance test may be tabulated on 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.

40 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Te s t F ai lu r e Performance Tests

Test Failure

If the Agilent 81618A/19A Interface module or Agilent 81623B/4B/6B/8B Optical Head fails any performance test, return the instrument to the nearest Agilent Technologies Sales / Service Office for repair.

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Instrument Specification

Instrument Specification

Specifications are the performance characteristics of the instrument that is certified. These specifications, listed in “Specifications” on page 23, are the performance standards or limits against which the Agilent 81623B/4B/6B/8B Optical Head can be tested. “Specifications” on page 23 also lists some supplemental characteristics of the Agilent 81623B/4B/6B/8B Optical Head. Supplemental characteristics should be considered as additional information.

Agilent 81618A/19A Interface Modules are tested for functionality only.

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 supercede any that were previously published.

42 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Functional Tests Performance Tests

Functional Tests

The functional test applies to the Agilent 81618A/19A Interface modules.

Mainframe 8163A/B with

8161xA Interface Module as DUT

Figure 7 Functional Test Setup

Set up the equipment as shown in Figure 7

2 If you are using an Agilent 81619A Interface module connect one optical

head to channel 1 and the other to channel 2

3 Power up the mainframe.

If the Agilent 81618A/19A passes all self-tests, the module is considered fully functional.

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Performance Tests

The performance tests given in this section includes the Accuracy Test, the Linearity Test, the Return Loss Test (for the 81623B/26B) and the Noise Test. The performance tests for the Agilent 81624B/6B also include – as optional tests – the Relative Polarization Uncertainty and the Relative Interference Uncertainty Test. Perform each step in the order given, using the corresponding test equipment.

NOTE

Make sure that all optical connections are dry and clean. DO NOT USE INDEX MATCHING OIL. For cleaning, use the cleaning instructions given in “Cleaning Information” on page 81.

The optical cables from the laser source to the 8156A Attenuator and from there to the power meter must be fixed to the table to ensure minimum cable movement during the tests.

44 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

For 81628B only

The performance test for the 81628B High Power Head does not differ from the test procedure for an optical head without an integrating sphere, except for the linearity test. The integrating sphere of the 81628B has to be disconnected for testing the linearity of the head alone. A special adapter and a disconnecting tool are necessary for disconnection. These tools are included in the Performance Test Kit (order P/N 81628-68705).

If the integrating sphere is disconnected the performance of the 81628B has to be verified. If performing a performance test on the 81628B that includes the linearity test, it is necessary to start the procedure with the linearity test and then perform the accuracy and noise tests afterwards.

The non-linearity of the 81628B is not normally tested up to the specified power level of +38 dBm. The linearity test only verifies the linearity of the head without the integrating sphere up to 10 dBm (equivalent to 40 dBm with the integrating sphere). The attenuation of the integrating sphere is typically 31 ± 1 dB, hence the maximum input power for the photodiode is in the range 6 - 8 dBm and so the test described below covers this input power range of the photodiode. The contribution of the sphere to the nonlinearity is caused by the heating of the sphere due to applied power > 30 dBm. These linearity characteristics are determined by sample testing of the 81628B in OCMD’s metrology lab.

The thermal characteristics of the sphere do not change from device to device, or during the product lifetime. If a head without the sphere passes the linearity test within the specifications given on the Test Record Sheet, then the whole system - sphere and head - is within the product specification.

The head and the integrating sphere of the 81628B are adjusted and serialized together, therefore the specifications of the 81628B are only valid for that given combination of head and integrating sphere.

The disconnecting and connecting of the integrating sphere may change the performance verification data slightly.

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Accuracy Test

This performance test applies to Agilent 81623B/4B/6B/8B Optical Heads.

NOTE

The linearity test must only be performed at either 1310 nm or 1550 nm. The accuracy test must be performed in the -20 dBm range at 10.0 µW at both 1310 nm and 1550 nm.

Tes t Se tu p

1 Make sure that cable connector, detectors and adapters are clean.

2 Connect the equipment as shown in Figure 8 .

Figure 8 Accuracy Test Setup

NOTE

Make sure that the cables to and from the attenuator are fixed on the table and that both the optical head and the DUT are close together so that minimum cable movement is required when connecting the cable to the head or to the DUT.

Use 81101PC patchcord for measurement path and 81001FA connector adapter (for the DUT) and 81000FA connector adapter (for reference power meter) instead.

46 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

3 Move to the Laser Source channel, move to the wavelength parameter,

[λ], press Enter, select the lower wavelength source, and press Enter.

4 If you are using an Agilent 81657A Laser Source make sure you initialize

the Agilent 8156A Optical Attenuator with 30 dB attenuation.

5 Turn the instruments on, enable the laser source and allow the

instruments to warm up for at least 20 minutes.

6 Perform the following sub-procedure for both Power Meters:

a Move to the Power Meter channel. b Move to the wavelength parameter, [λ], press Enter, enter the

wavelength of the laser source, and press Enter.

c Move to the calibration parameter, [CAL], press Enter, set the

calibration parameter to zero, and press Enter.

d Move to the averaging time parameter, [AvgTime], press Enter,

move to <500 ms>, and press Enter.

e Move to the power parameter, [P], press [Pwr unit], move to

<Watt>, and press Enter.

7 Make sure the optical input of the Device Under Test (DUT), 8162xA/B,

is not receiving any light by placing a plastic cap over the input. Move to the DUT Power Meter channel, press [Menu], move to <Zero>, press Enter.

8 Ensure that the Agilent 8156A output is disabled. Move to the reference

Power Meter channel that uses the Agilent 8162xB Optical Head and Agilent 81618A Optical Head Interface module, press [Menu], move to <Zero>, press Enter.

9 Enable the Agilent 8156A output and change the attenuation until the

reference Power Meter displays 10.00 mW.

10 Connect the attenuator output cable to the DUT Power Meter. Note the

power value returned from the DUT, [P], from the display and note the result in the test record.

11 Move to the Laser Source channel, move to the wavelength parameter,

[λ], press Enter, select the longer wavelength source, and press Enter.

12 Repeat steps 4 to 10 at the second wavelength with the corresponding

source.

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Linearity Test

This performance test applies to Agilent 81623B/4B/6B/8B Optical Heads

NOTE

81628B only:

You have to disconnect the integrating sphere of the 81628B head to verify the linearity. Use the 81102SC high return loss patchcord to connect the DUT to the attenuator.

Figure 9 Measurement Setup for Power Linearity

48 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Test Setup

NOTE

• Do not turn the laser off during the measurement!

• Clean all connectors carefully before you start with the measurement!

The linearity test checks the in-range linearity as well as the range discontinuity. Therefore, two values are measured at the same power but within different power ranges (range discontinuity) and two different power values , one on the lower and the other on the upper limit of the power range, are measured within the same power range (in-range linearity).

Perform the test until the power reading of the DUT shows:

for 81623B: -47.x dBm for 81624B: -57.x dBm for 81626B: -37.x dBm for 81628B: -57.x dBm (without sphere)

1 Make sure that cable connector, detectors and adapters are clean.

2 Make sure that you perform this test in a temperature-controlled

environment with temperature fluctuations less than ±1°C.

3 Setup the equipment as shown in Figure 9 . Disable both attenuators

and enable the laser source, where the source wavelength is chosen to 1550 nm. If you are using the 81657A, move to the wavelength parameter, [λ], press Enter, select the longer wavelength source (1550 nm nominally), and press Enter.

4 Set the wavelength of both attenuators to the same wavelength as the

laser source.

5 Perform the following sub-procedure for both Power Meters:

a Move to the Power Meter channel.

b Move to the wavelength parameter, [λ], press Enter, enter the

wavelength of the laser source, and press Enter.

c Move to the calibration parameter, [CAL], press Enter, set the

calibration parameter to zero, and press Enter.

d Move to the averaging time parameter, [AvgTime], press Enter,

move to <100 ms>, and press Enter.

e Move to the power parameter, [P], press [Pwr unit], move to <dBm>,

and press Enter.

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Press the [Menu] softkey and move to <Number of digits>, press

Enter, move to <3>, press Enter and press [Close].

NOTE

Always include at least three digits after the decimal point when you note a power reading.

6 Initialize the two attenuators as follows:

a Set the attenuation of the 8156A #221 with Monitor Output (referred

to as Atty1) to 0 dB.

b Set the attenuation of the other 8156A (referred to as Atty2) to

35 dB.

7 Wait at least 15 minutes until the laser source has stabilized.

8 Perform the following sub-procedure for the reference Power Meter,

81634B:

a Press [Menu], move to <Range mode>, move to <Manual>, and

press Enter.

b Move to <Range>, press Enter, move to <-50 dBm>, press Enter, and

press [Close].

9 Perform the following sub-procedure for the DUT, 8162xB:

a Press [Menu], move to <Range mode>, move to <Manual>, and

press Enter.

b Move to <Range>, press Enter, move to <10 dBm>(40 dBm for

81628B), and press Enter.

c Zero both Power Meters. Move to <Zero all> and press Enter.

10 Enable both attenuators.

11 Adjust the attenuation of Atty2 in order to achieve -47.2 dBm on the

reference Power Meter.

NOTE

For 81628B:

Before starting the measurement move to the DUT channel and enter a calibration factor of 31 dB. This simulates the disconnected integrating sphere. If the power at the DUT overflows when switching to the lower range decrease the calibration factor (e.g. to 30 dB) and start the linearity test again.

+10 dBm Range (equivalent to +40 dBm range for 81628B)

1 Applies to the 81626B only:

50 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Switch to the 20 dBm range and note both power readings as n=0 in the test record, which is given at the end of the test descriptions (#0, that is n=0). Switch back to the 10 dBm range.

2 Note both power readings as the first value (n=1) in the test record,

which is given at the end of the test descriptions (#1).

3 Increase the attenuation of Atty1 until the power reading of the DUT

shows about +2.8 dBm.

4 Note the InRange-values in the test record (#2)

5 At the DUT, 8162xB, move to <Range>, press Enter, move to <0 dBm> (30

dBm for 81628B), and press Enter.

6 Adjust the attenuation of Atty2 in order to be on the upper limit of the -

50 dBm range at the reference power meter (i.e. -47.2 dBm).

0 dBm Range (equivalent to +30 dBm range for 81628B)

1 Disable Atty1.

2 Zero both Power Meters. On the 8163A/B with two installed power

meters, press [Menu], move to <Zero all>, and press Enter.

3 Enable Atty1.

4 Switch one range up to the +10 dBm range (+40dBm for 81628).

5 Note both power readings (#3).

6 Switch down to the previous range (0 dBm, 30 dBm for the 81628B) and

note the values again (#4).

7 Increase Atty1 by 10 dB and note the results in the test record (#5).

8 At the DUT, 8162xB, press [Menu], move to <Range>, press Enter, move

to <-10 dBm>(20 dBm for the 81628B), press Enter, and press [Close].

9 If necessary, adjust the attenuation of Atty1 in order to be on the upper

limit of the range (i.e. -x7.y dBm).

10 Decrease the attenuation of Atty2 by 10 dB in order to be on the upper

limit of the -50 dBm range at the reference power meter.

-10 dBm Range (equivalent to +20 dBm range for 81628B)

1 Disable Atty1

2 Zero both Power Meters. On the 8163A/B with two installed power

meters, press [Menu], move to <Zero all>, and press Enter.

3 Enable Atty1.

4 Switch one range up to the 0 dBm range (30 dBm for the 81628B) and

note the power readings (#6).

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Switch down to the previous range (-10 dBm, 20 dBm for the 81628B) and

note the values again (#7).

6 Increase the attenuation of Atty1 by 10 dB and note the results in the test

record (#8).

7 At the DUT, 8162xB, press [Menu], move to <Range>, press Enter, move

to <-20 dBm>(10 dBm for the 81628B), press Enter and press [Close].

8 If necessary, adjust the attenuation of Atty1 in order to be on the upper

limit of the range (i.e. -x7.y dBm).

9 Decrease the attenuation of Atty2 to 10 dB in order to be on the upper

limit of the -50 dBm range at the reference power meter.

-20 dBm Range (equivalent to +10 dBm range for 81628B)

1 Disable Atty1.

2 Zero both Power Meters. On the 8163A/B with two installed power

meters, press [Menu], move to <Zero all>, and press Enter.

3 Enable Atty1.

4 Switch one range up to the -10 dBm (20 dBm for the 81628B) range and

note the power readings (#9).

5 Switch down to the previous (-20 dBm, 10 dBm for the 81628B) and note

the power readings again (#10).

6 Increase the attenuation of Atty1 by 10 dB and note the results in the test

record (#11).

7 On the DUT switch one range down to the -30 dBm (0 dBm for the

81628B) range.

8 If necessary, adjust the attenuation of Atty1 in order to be on the upper

limit of the range (i.e. -x7.y dBm).

9 Decrease the attenuation of Atty2 by 10 dB in order to be on the upper

limit of the -50 dBm range.

-30 dBm Range (equivalent to 0 dBm range for 81628B)

1 Disable Atty1.

2 Zero both power meters. On the 8163A/B with two installed power

meters, press [Menu], move to <Zero all>, and press Enter.

3 Enable Atty1.

4 Switch one range up to the -20 dBm range (10 dBm for the 81628B) and

note the power readings (#12).

5 Switch down to the previous range (-30 dBm, 0 dBm for the 81628B) and

note the values again (#13).

52 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

6 Increase the attenuation of Atty1 by 10 dB and note the results in the test

record (#14).

7 On the DUT switch one range down to the -40 dBm (-10 for 81628B)

range.

Change Setup

1 Disable Atty1 and switch the output with the monitor output.

2 Set the attenuation of Atty1 to 35 dB and of Atty2 to 25 dB.

3 Enable Atty1 again.

4 Adjust the attenuation of both attenuators in the following order:

• Atty1: DUT Power Meter shows a reading of -37.2 dBm.

• Atty2: the REF Power Meter shows a reading of -47.2 dBm.

-40 dBm Range (equivalent to -10 dBm range for 81628B)

1 Disable Atty1.

2 Zero both Power Meters. On the 8163A/B with two installed power

meters, press [Menu], move to <Zero all>, and press Enter.

3 Enable Atty1.

4 Switch one range up to the -30 dBm (0 dBm for the 81628B) range and

note the power readings (#15).

5 Switch one range down (-40 dBm, -10 dBm for the 81628B) and note the

power readings again (#16).

6 Increase the attenuation of Atty1 by 10 dB and note the results in the test

record (#17).

7 O n t he DUT s witch one range down to the - 50 dBm ran ge (- 20 dB m f or the

81628B).

8 If necessary, adjust the attenuation of Atty1 in order to be on the upper

limit of the range (i.e. -x7.y dBm).

9 Decrease the attenuation of Atty2 by 10 dB in order to be on the upper

limit of the -50dBm range at the reference power meter.

-50 dBm Range (equivalent to -20 dBm range for 81628B)

1 Disable Atty1.

2 Zero both power meters. On the 8163A/B with two installed power

meters, press [Menu], move to <Zero all>, and press Enter.

3 Enable Atty1.

4 Switch one range up to the -40 dBm (-10 dBm for the 81628B) range and

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

note the power readings (#18).

5 Switch one range down (-50 dBm, -20 dBm for the 81628B)) and note the

power readings (#19).

6 Increase the attenuation of Atty1 by 10 dB and note the results in the test

record (#20).

Calculation

12 Calculate the non-linearity using the formulas given in the test record.

Example: Measurement Results

Information only Your Entries

Atty1 / #221

1 0 42 10 -47,1915 9,4273 1. Value

2 6,6 42 10 -53,769 2,8467 InRange

3 6,6 35,5 10 -47,262 2,8524 RangeDisc / lower limit

4 6,6 35,5 0 -47,2605 2,8543 RangeDisc / upper limit

5 16,6 35,5 0 -57,2304 -7,1141 InRange

6 16,6 25,5 0 -47,2363 -7,1118 RangeDisc / lower limit

7 16,6 25,5 -10 -47,2347 -7,1097 RangeDisc / upper limit

8 26,6 25,5 -10 -57,2345 -17,111 InRange

9 26,6 15,5 -10 -47,2411 ,17,106 RangeDisc / lower limit

10 26,6 15,5 -20 -47,2382 -17,1054 RangeDisc / upper limit

11 36,6 15,5 -20 -57,228 -27,0942 InRange

12 36,6 5,5 -20 -47,2317 -27,0864 RangeDisc / lower limit

13 36,6 5,5 -30 -47,2318 -27,0873 RangeDisc / upper limit

14 46,6 5,5 -30 -57,2336 -37,089 InRange

15 35,5 17,6 -30 -47,219 -37,253 RangeDisc / lower limit

16 35,5 17,6 -40 -47,2195 -37,22538 RangeDisc / upper limit

17 45,5 17,6 -40 -57,1333 -47,166 InRange

18 45,5 7,6 -40 -47,1411 -47,164 RangeDisc / lower limit

19 41,2 11,3 -50 -47,1355 -47,1664 RangeDisc / upper limit

20 51,2 11,3 -50 -57,134 -57,163 InRange

[dB]

Atty2 / #100

[dB]

DUT Range

[dBm]

REF

Power [dBm]

DUT Power

[dBm]

Notes

54 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Calculations

Conversion [dBm] → [mW]

Calculation as given Calculation as given

n Ref / R DUT / D Relation1 / A Relation2 / B Non-Linearity

[mW] [mW]

= An*Bn (NL

n±1

+1) - 1

[%]

1 1,90919E-05 8,76455761 0,2199125

4,5505092

0,1

2 4,19856E-06 1,926060834

3 1,87845E-05 1,928590397 1,0003454 0,9995626 0,03

4 1,8791E-05 1,929434323 0,1006955 9,9275024 0,04

5 1,89217E-06 0,194352441

6 1,8896E-05 0,194455396 1,0003685 0,9995166 0,08

n+1

= R

n+1

= D

7 1,8903E-05 0,194549447 0,1000046 10,002994 0,09

8 1,89038E-06 0,019449122

9 1,88751E-05 0,019471526 1,000668 0,9998619 0,05

10 1,88877E-05 0,019474217 Reference Level 0,00

11 1,89322E-06 0,00195245 9,9765412

0,1002582

0,02

12 1,8916E-05 0,00195596

13 1,89156E-05 0,001955555 1,000023 0,9997928 0,01

14 1,89078E-06 0,000195479 10,004146 0,0999609 0,01

15 1,89714E-05 0,000188235

16 1,89692E-05 0,0001882 1,0001151 0,99981581 0,00

n-1

= R

n-1

= D

17 1,93495E-06 1,92044E-05 9,803474 0,1013767 0,03

18 1,93593E-05 1,92132E-05

19 1,93997E-05 1,92026E-05 1,001013651 0,9994475 0,08

20 1,93464E-06 1,92176E-06 9,996546719 0,1000783 0,13

NOTE

: The Nonlinearity is calculated recursively using n=10 as reference

point. The formula is:

where NL n=1, 4, 7 the values are NL

n+1

or NL

is the previously calculated non-linearity value. For

n-1

, while they are NL

n+2

for n=13, 16, 19.

n-2

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Figure 10 Example of Linearity Test Result.

56 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Noise Test

This performance test applies to Agilent 81623B/4B/6B/8B Optical Heads.

NOTE

You must insert a module or a blank panel in the second channel position of the Agilent 8163A/B Lightwave Multimeter before you perform the noise measurement.

1 Insert an Agilent 81618A or an Agilent 81619A Optical Head Interface

module into one slot of the Agilent 8163A/B Lightwave Multimeter and connect the device under test, an 8162xA/B Optical Head, to the Optical Head Interface module.

2 Make sure the optical input of the Device Under Test (DUT), an

8162xA/B Optical Head, is not receiving any light by placing a plastic cap over the input adapter. Move to the DUT Power Meter channel, press [Menu], move to <Zero>, and press Enter.

3 Press Appl, move to <Stability>, and press Enter. The Stability Setup

Screen appears.

4 Ensure that the correct channel is selected in the upcoming Module

Selection box.

5 Press [Menu] to access the Logging application menu screen.

6 Move to <Pwr unit>, press Enter, move to <W>, and press Enter.

7 Move to <AvgTime>, press Enter, move to <1 s>, and press Enter.

8 Move to <Range mode>, press Enter, move to <Auto>, and press Enter,

and press [Close].

9 Press the [Parameter] softkey, move to [TotalTime], press Enter, set the

total time to 00:05:00, which is 5 minutes, and press Enter.

10 Press the [Measure] softkey to start the measurement.

11 After the stability application has finished, press the [Analysis] softkey,

press the [more] softkey, and note [∆P] as the noise value in the test record.

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Return Loss Test

This performance test applies to Agilent 81623B/4B/6B/Optical Heads.

1 Make sure that all connectors are clean.

2 Connect the equipment as shown in Figure 11 .

3 Press [Preset] on the mainframe.

NOTE

CAUTION

Figure 11 Return Loss Reference Setup

To ensure traceability, use the 81610CC Reference Cable for calibration measurements. Do not use the 81610CC Reference Cable for measurements on a Device Under Test. Instead, use a measurement patchcord.

It is important to maintain the quality of the straight connector end of the 81610CC Reference Cable. Never add another connector to the straight end of the 81610CC Reference Cable, since a physical connection is made. When the straight end of the 81610CC Reference Cable is connected to the 81634B Power Sensor module, no physical connection is made so there should be no degradation of connector quality.

Zero the Return Loss Module and the Optical Head

5 Enable the internal laser source of the Return Loss Module and allow 20

minutes for it to stabilize.

58 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

6 At the Power Meter:

a Set the averaging time [AvTime] to 1s

b Set the wavelength [λ] to the wavelength of the RTL source.

c Set [Pwr unit] to <db>.

7 At the Return Loss Module:

a Set the averaging time [AvTime] to 1s.

b Enter the Return Loss Reference value RLref of the 81610CC

reference cable for this wavelength.

c Press [RefCal to calibrate the Return Loss module at reference

condition.

8 At the Power Meter press [Disp -> Ref]. The Power Meter should now

read 0.0 dB.

9 Disconnect the 81610CC Reference Cable from the setup and connect a

81113SC user cable to the Return Loss Module and leave the other end open as shown in Figure 8.

Figure 12 Return Loss Measurement Setup

At the Return Loss Module, press [TermCal] in order to calibrate the

Return Loss Module at termination condition.

Do not wrap the cable. The termination condition is realized with the open

NOTE

end of the patchcord.

11 Now connect the open end to the optical head.

12 Enter the Power reading [P] on the optical head as [FPDelta] on the

Return Loss Meter. Make sure you enter the sign of this value correctly.

13 Note the Return Loss reading as the Return Loss result into the test

record.

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Relative Uncertainty due to Polarization (Optional Test)

NOTE

The performance test "Relative Uncertainty due to Polarization" is optional, since the polarization is given with the production of the unit by mechanical and optical cavities and is unchanged by normal use of the sensor module.

Refer to Figure 13 for a setup to verify the relative uncertainty due to polarization of the sensor module.

Generally, during this measurement procedure the tunable laser source is swept through a predefined wavelength range. After every wavelength step, a single PDL-measurement is made, where the polarization controller generates all the different polarization states. The highest PDL value is taken as the "relative uncertainty due to polarization". The low output power path of the coupler is used to monitor the power stability of the setup.

60 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Figure 13 Measurement Setup for PDL Test

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Relative Uncertainty due to Interference (Optional Test)

NOTE

The performance test "Relative Uncertainty due to Interference" is optional, since the interference is given with the production of the unit by mechanical and optical cavities and is unchanged by normal use of the sensor module.

Refer to Figure 14 for a test setup to verify the relative uncertainty due to interference within the optical head optical assembly. In order to perform the relative uncertainty due to interference test, it is mandatory to use two mainframes, since the time difference between measurement A und B for a specific wavelength point has to be no greater than 2 ms. Due to this short measurement interval, the performance test of the Relative Uncertainty Due to Interference can only be performed under computer control.

62 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Figure 14 Setup for Relative Uncertainty due to Interference Measurement

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Theoretically, both Power Meters are monitoring the power ratio over the variable wavelength in a predefined range as shown in Figure 15 . Ensure that the tunable laser source is mode-hop free in the tested wavelength range.

Figure 15 Interference Ripple

64 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Performance Test for the Agilent 81623B

Page 1 of 3

Model Agilent 81623B Optical Head_ Date ___________

Serial No. _________________________ Ambient Temperature ___________°C

Options _________________________ Relative Humidity ___________ %

Firmware Rev. _________________________ Line Frequency ___________ Hz

Test Facility _________________________ Customer _________________________

Performed by _________________________ Report No _________________________

Special Notes ______________________________________________________________________

______________________________________________________________________

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Performance Test for the Agilent 81623B Test Equipment Used

Page 2 of 3

Description Model No. Trace No Cal. Due Date

1a1 Lightwave Multimeter (Std.) Agilent 8163A/B ____________ ___________

1a2 Lightwave Multimeter (DUT) Agilent 8163A/B ____________ ___________

1b TLS Mainframe Agilent 8164A/B ____________ ___________

2a Interface Module Agilent 81618A ____________ ___________

2b Interface Module Agilent 81619A ____________ ___________

3a CW Laser Source Agilent 81656A ____________ ___________

3b CW Laser Source Agilent 81657A ____________ ___________

4 CW Laser Source Agilent 81654A ____________ ___________

5a1 Opt. Head Interface Module Agilent 81618A ____________ ___________

5a2 Optical Head, Reference Agilent 81623A ____________ ___________

6 Sensor Module Agilent 81634A ____________ ___________

7 Optical Attenuator Agilent 8156A #221 ____________ ___________

8a Optical Attenuator Agilent 8156A #101 ____________ ___________

9 Return Loss Module Agilent 81613A ____________ ___________

10 ____________________________ ____________ ____________ ___________

11 ____________________________ ____________ ____________ ___________

12 ____________________________ ____________ ____________ ___________

Accessories # Product # Product # Product

Singlemode Fibers 2 81101AC 1 81113SC 3 81113PC

1 81610CC

Connector Interfaces 3 81000AI 3 81000FI 4 81000SI

Connector Adapters 2 81000AA 1 81000SA 1 81000FA

66 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Performance Test for the Agilent 81623B

Page 3 of 3

Model Agilent 81623B Optical Head Report No.________ Date ________________

Te s t

No. Test Description

IAccuracy Test

measured at _______ nm (1310nm) Output Power

measured at _______ nm (1550nm) Output Power

II Linearity Test

Range P

+10 +9 ________ _______ <± 1.13 %

+10 +3 ________ _______ <± 0.58 %

0 +3 ________ _______ <± 0.58 %

0 -7 ________ _______ <± 0.58 %

-10 -7 ________ _______ <± 0.58 %

-10 -17 ________ _______ <± 0.58 %

-20* -17* Reference

[dBm] P

DUT

For Calculations you may want to use the appropriate sheet

[dBm] Loss [%]

DUT

Min.

Spec.

9.72 µW _______ 10.28 µW

Result Max.

[µW]

0.0

Spec.

<± 0.58 %

Measurement

Uncertainty

-20 -27 ________ _______

-30 -27 ________ _______

-30 -37 ________ _______ <± 0.63 %

-40 -37 ________ _______ <± 0.63 %

-40 -47 ________ _______ <± 1.08 %

-50 -47 ________ _______ <± 1.08%

-50 -57 ________ _______ <± 5.59 %

III Noise Test

IV Return Loss Test

50 dB < _______

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

<± 0.58 %

[pW]

_______ < 100 pW

[dB]

Performance Tests Performance Tests

Performance Test for the Agilent 81624B

Page 1 of 3

Model Agilent 81624B Optical Head_ Date ___________

Serial No. _________________________ Ambient Temperature ___________°C

Options _________________________ Relative Humidity ___________ %

Firmware Rev. _________________________ Line Frequency ___________ Hz

Test Facility _________________________ Customer _________________________

Performed by _________________________ Report No _________________________

Special Notes ______________________________________________________________________

______________________________________________________________________

68 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Performance Test for the Agilent 81624B Test Equipment Used

Page 2 of 3

Description Model No. Trace No Cal. Due Date

1a1 Lightwave Multimeter (Std.) Agilent 8163A/B ____________ ___________

1a2 Lightwave Multimeter (DUT) Agilent 8163A/B ____________ ___________

1b TLS Mainframe Agilent 8164A/B ____________ ___________

2a Interface Module Agilent 81618A ____________ ___________

2b Interface Module Agilent 81619A ____________ ___________

3a CW Laser Source Agilent 81656A ____________ ___________

3b CW Laser Source Agilent 81657A ____________ ___________

4 CW Laser Source Agilent 81654A ____________ ___________

5a1 Opt. Head Interface Module Agilent 81618A ____________ ___________

5a2 Optical Head, Reference Agilent 81624A ____________ ___________

6 Sensor Module Agilent 81634A ____________ ___________

7 Optical Attenuator Agilent 8156A #221 ____________ ___________

8a Optical Attenuator Agilent 8156A #101 ____________ ___________

9 Return Loss Module Agilent 81613A ____________ ___________

10 ____________________________ ____________ ____________ ___________

11 ____________________________ ____________ ____________ ___________

12 ____________________________ ____________ ____________ ___________

Accessories # Product # Product # Product

Singlemode Fibers 2 81101AC 1 81113SC 3 81113PC

1 81610CC

Connector Interfaces 3 81000AI 3 81000FI 4 81000SI

Connector Adapters 2 81000AA 1 81000SA 1 81000FA

Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Performance Test for the Agilent 81624B

Page 3 of 3

Model Agilent 81624B Optical Head Report No.________ Date ________________

Tes t

No. Test Description

I Accuracy Test

measured at _______ nm (1310nm) Output Power

measured at _______ nm (1550nm) Output Power

II Linearity Test

Range P

+10 +9 ________ _______ <± 0.46 %

+10 +3 ________ _______ <± 0.46 %

0 +3 ________ _______ <± 0.46 %

0 -7 ________ _______ <± 0.46 %

-10 -7 ________ _______ <± 0.46 %

-10 -17 ________ _______ <± 0.46 %

-20* -17* Reference

[dBm] P

DUT

Min.

Spec.

9.72 µW _______ 10.28 µW

For Calculations you may want to use the appropriate sheet

[dBm] Loss [%]

DUT

Result Max.

[µW]

0.0

Spec.

<± 0.46 %

Measurement

Uncertainty

-20 -27 ________ _______

-30 -27 ________ _______

-30 -37 ________ _______

-40 -37 ________ _______

-40 -47 ________ _______

-50 -47 ________ _______

-50 -57 ________ _______ <± 2.97 %

III Noise Test

IV Return Loss Test

[pW]

_______ < 5 pW

[dB]

typ. 60 dB _______

<± 0.46 %

<± 0.49 %

<± 0.71 %

70 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition

Performance Tests Performance Tests

Performance Test for the Agilent 81626B

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Model Agilent 81626B Optical Head_ Date ___________