Atec Agilent-81618A User Manual

Agilent 81618A/9A Optical Head Interface Modules

and Agilent 81622B/3B/4B/6B/7B/8B Optical Heads

User’s Guide

Notices

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

No part of this document may be reproduced in any form 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 copywright laws.

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 printe d material, inc luding, but no t limited to, the implied warranties of merchantability and fitness for a particular purpo se.

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 editions 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 product is warranted against defects 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.

Exclusive Remedies

The reme dies prov ided herei n 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 assist ance agreem ents are available for Agilen t 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 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 system standard as part of our objective of continually increasing customer satisfaction through improved process control.

Second Edition:

81623-90B12

Second Edition:

81623-90B12

January 2002

First Edition :

81623-90044

July 2001

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.

2 Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B 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.

Caution - hot surface.

Magnetic fields - may interfere with a pacemaker.

Input Power Limitations

WARNING 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 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition 3

Safety Considerations

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

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.

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.

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. Protect the module from temperature extremes that may cause condensation within it.

4 Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition

Safety Considerations 3

Getting Started with Optical Heads 9

Tab l e o f C on te n ts

Safety Symbols 3 Input Power Limitations 3 Initial Inspection 4 Line Power Requirements 4 Operating Environment 4 Storage and Shipment 4

What is an Optical Head? 11

Analog Output 12 Optical input 12 Heat Sink for 81628B optical Head 12 Attaching the heat sink to the 81628B Optical Head 13

Applicable adapters 13 Mounting Instructions 13

Accessories 15

Modules and Options 17

Optical Heads 81622B/23B/24B/26B/28B (5 & 3 mm Sensors) 17 Optical Head 81627B - 3 mm Sensor 18 Connector Adapters - Reference List 19

Specifications 21

Definition of Terms 23

Averaging Time 23 Linearity 23 Linewidth 24 Noise 24 Power range 24 Reference conditions 24 Relative uncertainty (spectral ripple) due to interference 24 Relative uncertainty due to speckle noise 25 Relative uncertainty due to polarization 25

Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition 5

Table of Contents

Performance Tests 35

Return loss 26 Spectral width of optical source 26 Total uncertainty 26 Uncertainty at reference conditions 26 Wavelength range 26

Optical Head Specifications 27 Supplementary Performance Characteristics 33

Analog Output 33

Equipment Required 37 Test Record 38 Test Failure 39 Instrument Specification 39 Functional Tests 40 Performance Tests 41

For 81628B only 41 Accuracy Test 43 Linearity Test 45

Calculation 51

Noise Test 54 Return Loss Test 55 Relative Uncertainty due to Polarization (Optional Test) 57 Relative Uncertainty due to Interference (Optional Test) 59 Calculation Sheets 85

Cleaning Information 87

Cleaning Instructions for this Device 89

81000xA Optical Head Adapters 89 8162xx Optical Power Heads 89

Safety Precautions 90 Why is it important to clean optical devices? 90 What do I need for proper cleaning? 91

Standard Cleaning Equipment 91

Dust and shutter caps 91 Isopropyl alcohol 92 Cotton swabs 92

6 Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition

Tab l e o f C on te n ts

Soft tissues 93 Pipe cleaner 93 Compressed air 93

Additional Cleaning Equipment 94

Microscope with a magnification range about 50X up to 300X 94 Ultrasonic bath 94 Warm water and liquid soap 95 Premoistened cleaning wipes 95 Polymer film 95 Infrared Sensor Card 95

Preserving Connectors 96 Cleaning Instrument Housings 96 Which Cleaning Procedure should I use ? 97

How to clean connectors 97 How to clean connector adapters 98 How to clean connector interfaces 99 How to clean bare fiber adapters 99 How to clean lenses 100 How to clean instruments with a fixed connector interface 101 How to clean instruments with an optical glass plate 101 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 104

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

Other Cleaning Hints 106

Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition 7

Table of Contents

8 Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition

Getting Started with Optical Heads

Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition 9

Getting Started with Optical Heads

This chapter introduces the features of the Agilent 81622B/3B/4B/6B/7B/8B Optical Heads.

10 Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second 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 lock the 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. Figure 3

shows two types of adapter that are available for connecting the input

fiber to an optical head.

Threaded connector adapter D-type magnetic connecter adapter

(preferred)

Figure 3 Connector adapters

Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition 11

Getting Started with Optical Heads What is an Optical Head?

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 (e.g. the 81627B is only available with a D-type interface, and the 81628B is only available with a threaded interface). See “Accessories” on page 15 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.

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 34dBm to 38 dBm.

12 Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition

What is an Optical Head? Getting Started with Optical Heads

Attaching the heat sink to the 81628B Optical Head

NOTE Always attach the heat sink and rubber ring to th e 81628B if operating

at an optical power higher than 34dBm!

Applicable adapters

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

NOTE If shipping the 81628B high power optical head please detach the

heatsink from the optical head to avoid damages during transportation.

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

2 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.

Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition 13

Getting Started with Optical Heads What is an Optical Head?

Figure 5 Attaching the Bottom Part of the Heat Sink

3 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

14 Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition

Accessories

Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition 15

Accessories

The Agilent 81618A/9A Optical Head Interface Modules and

Agilent 81622B/3B/4B/6B/7B/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.

16 Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition

Modules and Options Accessories

Modules and Options

Optical Heads 81622B/23B/24B/26B/28B

(5 & 3 mm Sensors)

Connectorized Fiber, Bare Fiber and Open beam NA= 0.3

Accessories

81624CE 4m extension cable 81624DD additional D-shape qui c k ch ange a dapte r 81624RM* Half-rack Mo unt K it for 2 H eads 81625RM* Rack Moun t K it for 4 He ads

Interface Module

Optical Heads

Interface Modules

81618A Single Interface Module 81619A Dual Interface Module

Optical Heads

81622B Ge +27dBm to – 55dBm 81623B Ge +10dBm to – 80 dBm 81624B InGaAs + 10dBm to – 90 dBm 81626B In GaAs + 27dBm to – 70 dBm 81628B In GaAs + 40dBm to – 60 dBm (use only with threaded C onn ec tor A dapt e r s)

D-Shaped Adapter 81624DD – 1ea supplied w it h he ad

High R etu rn L oss Ad apter

81000RA High Return Loss Adapter

Conne ctor Interfaces

81000AI Diamond HMS-1 0 81000FI FC/PC/SPC 81000GI D4 81000HI E2000 81000KI SC/PC/SPC 81000SI DIN 47256 81000VI ST 81002LI LC

ter

Depolarizing Filt er

8100DF

Connect or Adapters Threaded

Connector Adapters (threaded)

81000AA Diamond HMS-10 81000BA Bare Fiber (125um) 81000FA FC/PC/SPC/APC 81000GA D4 81000KA SC/PC/APC 81000MA MU 81000PA E2000 81000SA DIN 47256/4108 81000VA ST

81000ZA Blank Adapter (to be c ustomized by user) 810003LA LC

[1] For use with 81622B or 81626B and straight connectors If input power > +10dBm the use of the filter holder will result in better accura cy (refer to s pec s )

* not applicable to 81628B

Integrating Sphere

81002FF

High R etu rn Loss Ada

Connec tor Interfac es

Figure 7 Optical Head Accesories (5 & 3 mm Sensors)

Filter Holder [1]

Filter / Holder

81000AF Filter Holder 81001FF 10 dB Filter and Holder 81000DF Depolarizing Filter and Holder

Conne ctor Adapters (with intergral D-Shape)

81624DD D-Shaped adapter not

Integral D-Shaped Adapters

required

81001BA Bare Fiber 125µm 81001FA FC/PC/SPC/APC 81001KA SC/PC/APC 81001LA LC 81001MA MU 81001PA E-2000 81001SA DIN 47256 / 4108.6 81001ZA BLANK Adapter

81003JD MT - RJ 81003PD MPX 81003TD MTP

Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition 17

Accessories Modules and Options

Optical Head 81627B - 3 mm Sensor

Configuration for connectorized fibers and bare fiber

Accessories

81624CE 4m extension cable 81624RM* Half-rack Mount Kit for 2 Heads 81625RM* Rack Mount Kit for 4 Heads

Interface Module

Optical Head

Connect or Adapt ers with integral D-Adapter

Interface Modules

81618A 81619A

Optical Heads

81627B

Connector Adapters (with i nt erg ral D-S h ape )

81001BA Bare Fiber 125µm 81001FA FC/PC/SPC/APC 81001KA SC/PC/APC 81001LA LC 81001MA MU 81001PA E-2000,APC 81001SA DIN 47256 / 4108.6 81001ZA BLANK Adapter

NA = 0.11 (Single mode f iber) NA = 0.22 (Multi mode fiber)

Figure 8 Optical Head Accessories for 81627B (3 mm Sensor)

18 Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition

Modules and Options Accessories

Connector Adapters - Reference List

Preferred Adapters

Integral D-shape for 5 mm

Connector Type Threaded Version

HMS10 81000AA

Barefiber 81000BA opt. 002 810000BA opt. 001

FC/PC 81000FA 810001FA

NEC D4 81000GA

SC/PC 81000KA 810001KA

MU 81000MA 810001MA

MT-RJ 81003JD

E-2000 81000PA 810001PA

DIN 81000SA 810001SA

ST 81000VA

blank 81000ZA 810001ZA

LC 810003LA 810001LA

optical heads

Integral D-shape for 3mm and 5mm optical heads

MPX(ribbon) 81003PD

MTP(ribbon) 81003TD

Table 1 Connector Adapters

Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition 19

Accessories Modules and Options

20 Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition

Specifications

Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition 21

Specifications

The Agilent 81618A/9A Optical Head Interface Modules and

Agilent 81622B/3B/4B/6B/7B/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.

22 Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B 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 35.

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.

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

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,

, to an arbitrary displayed level, Dx. Symbol N.

if expressed in %

if expressed in dB

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

expressed by the following formula:

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

x/D0

⁄

xD0

æö

------------- ---- 1–

èø

⁄

xP0

()

log=

()rP0()–

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

100=

⁄

xD0

æö

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

èø

⁄

xP0

), can alternatively be

()

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).

Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition 23

Specifications Definition of Terms

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

min

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

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.

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.

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.

24 Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition

Definition of Terms Specifications

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

NOTE Spectral ripple is measured by stepping the source wavelength over

the wavelength range specified.

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 the power 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

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 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition 25

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.

æö

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

log=

èø

back

Spectral width of optical source

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

Total unce rtai nty

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, recalibration 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.

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

26 Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second 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 Agilent 81624B Agilent 81627B

Sensor Element Ge, Ø 5 mm InGaAs, Ø 5 mm InGaAs, Ø 3 mm

Wavelength Range 750 - 1800 nm 800 - 1700 nm 800 - 1700 nm

Power Range +10 to -80 dBm +10 to -90 dBm +10 to -90 dBm

Applicable Fiber Type Standard SM and MM max 100 µm core size, NA ≤ 0.3 Standard SM (max 10 µm core

size), NA ≤ 0.11

connector)

Standard MM (max 62.5 µm core size), NA ≤ 0.22

Open Beam Parallel beam max Ø 4 mm Parallel beam max Ø 2.5 mm

Uncertainty at Reference Conditions

Tot a l U nc ert a i nt y

Relative Uncertainty

- due to polarization

±3.5% ± 100 pW (1000 to 1650 nm)

≤± 0.01 dB 11 (typ. ± 0.005 dB)

±2.2%

(1000 to 1650 nm)

±2.2%

(1000 to 1630 nm)

±3.5% ± 5 pW (1000 to 1630 nm)

≤± 0.005 dB (typ. ± 0.002 dB)

±4.0% ± 5 pW (1000 to 1630 nm)

≤± 0.005 dB (typ. ± 0.002 dB)

(straight and angled

(straight connector)

±2.5%

(1000 to 1630 nm)

Spectral ripple (due to interference)

Linearity (power):

-at 23°C ±5°C<±0.025 dB ± 100 pW

- at operating temp. range <±0.05 dB ± 100 pW

Return Loss

≤± 0.006 dB (typ. ± 0.003 dB)

(CW +10 to -60 dBm)

(1000 - 1650 nm)

> 50dB

≤± 0.005 dB (typ. ± 0.002 dB)

(CW +10 to -70 dBm)

(1000 - 1630 nm)

<±0.02 dB ± 5pW <±0.02 dB ± 5pW

<±0.05 dB ± 5pW <±0.05 dB ± 5pW

≤± 0.005 dB (typ. ± 0.002 dB)

(CW +10 to -70 dBm)

(1000 - 1630 nm)

typ. 60 dB > 60 dB

typ. > 55 dB

Noise (peak to peak)

5, 6

< 100 pW < 5 pW < 5 pW

Analog Output included

Averaging Time (minimal) 100 µs

Dimensions (H x W x D) 57 mm × 66 mm × 156 mm

Weight 0.5 kg

Recalibration Period 2 years

Operating Temperature 0°C to +40°C

Humidity Non-condensing

Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition 27

Specifications Optical Head Specifications

Table 2 Optical Head Specifications

Agilent 81623B Agilent 81624B Agilent 81627B

Warm-up time 40 minutes

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 meter must correspond to source wavelength ± 0.4 nm

2 Total uncertainty includes: polarization, interference, linearity conditions:

• Parallel beam, 3mm spot diameter on the center of the detector or connectorized fiber with NA ≤ 0.2

(straight connector); for 81627B 2mm spot diameter

• For NA > 0.2, add 1%

• For 81627B and MM fiber add 1%

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

• Operating temperature range as specified; humidity: non-condensing

3 All states of polarization at constant wavelength (1550 nm ± 30 nm) and constant power, straight

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

4 Conditions:

Wavelength 1550 nm ± 30 nm, fixed state of polarization, constant power, Temperature 23°C ± 5°C, Linewidth of source ≥ 100 MHz, angled connector 8°.

5 At constant temperature (∆T = ± 1°C), zeroing required.

6 Averaging time 1s, T = 23°C ± 5°C, observation time 300 s. Wavelength range 1200 - 1630 nm.

7 Conditions

• Wavelengths 1550 nm ± 30 nm.

• Standard single-mode fiber, angled connector min 8°.

8 For input power > 2 mW, add ± 0.004 dB / mW

9 30°C for > +20 dBm input power

10 For input power >+10 mW add:

typ. ± 0.0016 dB / mW without Agilent 81000AF, or add

± 0.0008 dB / mW with Agilent 81000AF (direct coupled)

In the case of a negative power change >50 dB allow an addition recovery time of 3 minutes.

11 Specification valid for optical heads with S/N starting with "DE413..." or higher.

28 Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition

Optical Head Specifications Specifications

Table 3 High Power Optical Head Specifications

Agilent 81622B Agilent 81626B

Sensor Element Ge, Ø 5 mm InGaAs, Ø 5 mm

Wavelength Range 850 - 1650 nm 850 - 1650 nm

Power Range +27 to -55 dBm

(1250 - 1650 nm)

+23 to -55 dBm (850 - 1650 nm)

+27 to -70 dBm

(1250 - 1650 nm)

+23 to -70 dBm

(850 - 1650 nm)

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

Open Beam Parallel beam max Ø 4 mm

Uncertainty at Reference Conditions

Tot a l U nce r t ai nt y

Relative Uncertainty

- due to polarization

Spectral ripple

(due to interference)

Linearity (power):

-at 23°C ±5°C<±0.05 dB ± 40 nW

- at operating temp. range <±0.15 dB ± 40 nW

Return Loss

Noise (peak to peak)

5, 6

±3.0%

(950 to 1630 nm)

±5%± 40 nW10

±5.0% ± 500 pW

(950 to 1630 nm)

± 0.01 dB

(typ. ± 0.005 dB)

± 0.006 dB

(typ. ± 0.003 dB)

(CW +27 to -40 dBm)

(CW +27 to -50 dBm)

(950 - 1630 nm)

<±0.04 dB ± 500 pW

<±0.15 dB ± 500 pW

> 45dB >45dB

<40nW <500pW

±3.0%

(950 to 1630 nm)

± 0.005 dB

(typ. ± 0.002 dB)

± 0.005 dB

(typ. ± 0.002 dB)

(950 - 1630 nm)

Averaging Time (minimal) 100 µs

Analog Output included

Dimensions (H x W x D) 57 mm × 66 mm × 156 mm

Weight 0.5 kg

Recalibration Period 2 years

Operating Temperature 0°C to +35°C

Humidity Non-condensing

Warm-up time 40 minutes

Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition 29

Specifications Optical Head Specifications

Notes:

Agilent 81622B Agilent 81626B

Reference Conditions:

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

• Parallel beam, 3 mm spot diameter on the center of the detector (center of sphere input for 81628B)

• 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 meter must correspond to source wavelength ±

0.4 nm

Operating Conditions:

• Parallel beam, 3mm spot diameter on the center of the detector 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: non-condensing

All states of polarization at constant wavelength (1550 nm ± 30 nm) and

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

Conditions:

Wavelength 1550 nm ± 30 nm, fixed state of polarization, constant power, Temperature 23°C ± 5°C, Linewidth of source ≥ 100 MHz, angled connector 8°.

At const ant temperature (∆T = ± 1°C), zeroing required.

Averaging time 1s, T = 23°C ± 5°C, observation time 300 s. Wavelength range

1200 - 1630 nm.

Conditions

• Wavelengths 1550 nm ± 30 nm.

Standard single-mode fiber, angled connector min 8°.

8 For input power > 2 mW, add ± 0.004 dB / mW

9 30°C for > +20 dBm input power

For input power >+10 mW add:

typ. ± 0.0016 dB / mW without Agilent 81000AF, or add ± 0.0008 dB / mW with Agilent 81000AF (direct coupled)

In the case of a negative power change >50 dB allow an addition recovery time of 3 minutes.

30 Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition

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