EXFO IQS-12004B User Manual

IQS-12004B

DWDM Passive Component Test System

User Guide

Copyright © 2002–2007 EXFO Electro-Optical Engineering Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form, be it electronically, mechanically, or by any other means such as photocopying, recording or otherwise, without the prior written permission of EXFO Electro-Optical Engineering Inc. (EXFO).

Information provided by EXFO is believed to be accurate and reliable. However, no responsibility is assumed by EXFO for its use nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent rights of EXFO.

EXFO’s Commerce And Government Entities (CAGE) code under the North Atlantic Treaty Organization (NATO) is 0L8C3.

The information contained in this publication is subject to change without notice.

Trademarks

EXFO’s trademarks have been identified as such. However, the presence or absence of such identification does not affect the legal status of any trademark.

Units of Measurement

Units of measurement in this publication conform to SI standards and practices.

Version number 1.3.1.

ii IQS-12004B

Contents

Certification Information ....................................................................................................... ix

1 Introducing the IQS-12004B DWDM Passive Component Test System ...... 1

Step-by-Step Approach ...........................................................................................................2

Test Features and Results ........................................................................................................3

Modularity and Flexibility .......................................................................................................3

System Overview ....................................................................................................................4

Testing Many Devices with the MultiPath Testing Option .......................................................5

Hardware Components Description ........................................................................................6

Tunable Laser Source ..............................................................................................................7

Module Description ................................................................................................................8

Testing Procedure ...................................................................................................................9

Database Structure ...............................................................................................................11

Using GPIB or COM to Control the System ............................................................................12

Conventions ..........................................................................................................................14

2 Safety Information ..................................................................................... 15

Laser Safety Information .......................................................................................................15

Safety Information ...............................................................................................................15

3 Getting Started with Your DWDM Passive Component Test System ....... 17

Inserting and Removing Test Modules .................................................................................17

Installing Hardware Components .........................................................................................22

Installing the IQS-12004B DWDM Passive Component Test System Software .......................28

Installing the MultiPath Testing Option Software ..................................................................29

Starting and Exiting the DWDM Passive Component Test System Application ......................31

Accessing a Specific Test Step ...............................................................................................34

Starting and Exiting the MultiPath Testing Option Application .............................................35

4 Setting Up the DWDM Passive Component Test System ......................... 37

Configuring DUT Parameters for Pass/Fail Analysis ................................................................37

Configuring an Optical Port ..................................................................................................39

Configuring a DUT ................................................................................................................42

Configuring DUT Company/Customer Parameters .................................................................44

Customizing the Channel List ...............................................................................................46

Preparing the Test Setup .......................................................................................................49

Identifying the Current DUT .................................................................................................54

Modifying System Settings ...................................................................................................56

DWDM Passive Component Test System iii

Contents

5 Operating the DWDM Passive Component Test System ...........................59

Working with Access Levels ..................................................................................................59

Opening a New Test Database ..............................................................................................61

Opening an Existing Test Database .......................................................................................64

Viewing a Recent Test ...........................................................................................................65

Hiding the Welcome/New Test Window ................................................................................65

Cleaning and Connecting Optical Fibers ...............................................................................66

Connecting DUT and Modules ..............................................................................................67

Starting the ORL Measurement Scan ....................................................................................69

Testing Another Component .................................................................................................70

Sharing the Power Meters and WRM with an External Application .......................................70

Monitoring Modules in Local Mode ......................................................................................71

Viewing System Information .................................................................................................72

6 Calibrating the DWDM Passive Component Test System .........................73

Calibrating the System ..........................................................................................................73

Performing Reference Measurements ...................................................................................82

7 Interpreting the DWDM Passive Component Test System Results ...........87

Optimizing Performance .......................................................................................................87

Viewing Test Results ..............................................................................................................90

Exporting Data ......................................................................................................................94

Viewing the Results Graph ....................................................................................................97

Printing Test Results ............................................................................................................103

Organizing Tests .................................................................................................................107

Running Windows Explorer from the Application ...............................................................108

Clearing Database Files from the List ..................................................................................108

8 Using the Database Browser ....................................................................109

Opening the Database Browser ..........................................................................................109

Browsing the Database .......................................................................................................110

Viewing Test Results ............................................................................................................110

Printing a Report ................................................................................................................111

Typing Items to Find ...........................................................................................................111

Exiting the Database Browser .............................................................................................111

9 Referencing the System with MultiPath Testing Option ........................113

Nulling Electrical Offsets .....................................................................................................113

Calibrating the System Wavelength Response ....................................................................114

Calibrating Your System for ORL Testing .............................................................................115

Optimizing Power ...............................................................................................................115

Performing Reference Measurements .................................................................................116

iv IQS-12004B

Contents

10 Testing Multiple DUTs with the LabVIEW Application ............................ 117

Starting a New Test .............................................................................................................118

Opening an Existing Test Database .....................................................................................119

Setting Up Device (DUT) Connectivity Configuration ..........................................................120

Configuring Test Parameters ...............................................................................................122

Nulling Electrical Offsets .....................................................................................................124

Calibrating the System Wavelength Response ....................................................................125

Calibrating your System for ORL Testing .............................................................................127

Performing Reference Measurements .................................................................................129

Performing a Test ................................................................................................................131

Monitoring Modules in Local Mode ....................................................................................132

Viewing System Information ...............................................................................................134

Adjusting Result Settings ....................................................................................................134

Modifying the Supplied MPT Application ............................................................................138

11 Using the Wavelength Calibration Software .......................................... 139

Overview of the Application ...............................................................................................139

Initializing the Modules ......................................................................................................140

Preparing the Calibration ....................................................................................................141

Performing the Acquisition .................................................................................................143

Analyzing the Results ..........................................................................................................144

Using Calibration Tools .......................................................................................................145

Viewing and Printing a Calibration Certificate ....................................................................146

12 Using the Power Meter Linearity Verification Tool ................................ 149

Starting and Exiting the Application ...................................................................................151

Connecting the Modules for Linearity Testing .....................................................................152

Initializing Hardware ...........................................................................................................154

Nulling Electrical Offsets .....................................................................................................155

Selecting the DUT and Reference Power Meter ...................................................................157

Setting Up the Acquisition Parameters ...............................................................................158

Verifying Linearity on a Specific Channel ............................................................................160

Viewing and Printing Test Results .......................................................................................163

Viewing Online User Guide .................................................................................................165

Getting Technical Support Information ...............................................................................166

DWDM Passive Component Test System v

Contents

13 Automating or Remotely Controlling the System ..................................167

Initializing the Hardware ....................................................................................................169

Nulling Electrical Offsets .....................................................................................................170

Optimizing the Power .........................................................................................................170

Calibrating the System ........................................................................................................171

Referencing the System ......................................................................................................173

Testing the DUT ..................................................................................................................175

Retrieving Results ...............................................................................................................176

Controlling Instruments with GPIB .....................................................................................176

Starting the GPIB Remote Application ................................................................................177

Modifying GPIB Parameters ................................................................................................178

Opening a GPIB Connection ................................................................................................179

Closing a GPIB Connection .................................................................................................181

Editing GPIB Information ....................................................................................................181

Logging GPIB Information ..................................................................................................182

Monitoring the Power Meter ..............................................................................................182

Printing GPIB Information ...................................................................................................183

GPIB Command Structure ...................................................................................................184

GPIB General Commands—Quick Reference .......................................................................186

GPIB Specific Commands—Quick Reference .......................................................................187

GPIB Error Messages Format ...............................................................................................194

SCPI Error Messages ...........................................................................................................195

Configuring Your DWDM Passive Component Test System as a GPIB Controller ..................200

COM Objects ......................................................................................................................205

IQS-12004B DWDM Passive Component Test System (Standard) COM Error Messages .......208

MultiPath Testing Option COM Error Messages ..................................................................211

14 Maintenance ..............................................................................................213

Cleaning Fixed Connectors ..................................................................................................214

Cleaning EUI Connectors ....................................................................................................216

Cleaning Detector Ports ......................................................................................................218

Cleaning Fiber Ends ............................................................................................................218

Recalibrating the Unit .........................................................................................................219

Disposing of Old CKT Modules ...........................................................................................219

Recycling and Disposal (Applies to European Union Only) ..................................................220

15 Troubleshooting ........................................................................................221

Viewing the Online User Guide ...........................................................................................221

Consulting the About Window of the LabVIEW Application ...............................................221

Finding Information on the EXFO Web Site ........................................................................222

Contacting the Technical Support Group ............................................................................223

Transportation ....................................................................................................................224

vi IQS-12004B

Contents

16 Warranty ................................................................................................... 225

General Information ...........................................................................................................225

Liability ...............................................................................................................................226

Exclusions ...........................................................................................................................226

Certification ........................................................................................................................226

Service and Repairs .............................................................................................................227

EXFO Service Centers Worldwide ........................................................................................228

A Technical Specifications ........................................................................... 229

IQS-12004B DWDM Passive Component Test System ..........................................................229

IQS-12004B MultiPath Testing Option .................................................................................230

B SCPI Commands Reference ...................................................................... 231

General Commands ............................................................................................................231

Specific Commands ............................................................................................................233

DWDM Passive Component Test System vii

Contents

C COM Objects Reference ............................................................................269

DWDMAcq Interface—Properties ........................................................................................270

Measures Interface—Methods ............................................................................................274

Measures Interface—Properties ..........................................................................................280

Modules Interface—Methods .............................................................................................286

Modules Interface—Properties ............................................................................................290

Results Interface—Methods ................................................................................................304

Results Interface—Properties ..............................................................................................304

Test Parameters Interface—Properties .................................................................................309

clsDescModule Object—Properties .....................................................................................314

clsChannel Object—Properties ............................................................................................317

Event ..................................................................................................................................318

Available Enumerations ......................................................................................................328

Switch Interface—Methods ................................................................................................335

Switch Interface—Properties ...............................................................................................338

Analysis Interface—Methods ..............................................................................................347

Analysis Interface—Properties .............................................................................................358

ChannelResult Object ..........................................................................................................363

ChannelResult Object—Properties ......................................................................................364

BandPass Object .................................................................................................................367

BandPass—Properties .........................................................................................................368

BandPassResult Object ........................................................................................................372

BandPassResult—Methods ..................................................................................................374

BandPassResult—Properties ................................................................................................375

Notch Object ......................................................................................................................386

Notch—Properties ..............................................................................................................387

NotchResult Object .............................................................................................................393

NotchResult—Properties .....................................................................................................394

Undefined ...........................................................................................................................399

D Definitions and Calculation Methods ......................................................405

viii IQS-12004B

Certification Information

F.C.C. Information

Electronic test equipment is exempt from Part 15 compliance (FCC) in the United States. However, compliance verification tests are systematically performed on most EXFO equipment.

 Information

Electronic test equipment is subject to the EMC Directive in the European Union. The EN61326 standard prescribes both emission and immunity requirements for laboratory, measurement, and control equipment. This unit has undergone extensive testing according to the European Union Directive and Standards.

IMPORTANT

Use of shielded remote I/O cables, with properly grounded shields and metal connectors, is recommended in order to reduce radio frequency interference that may emanate from these cables.

DWDM Passive Component Test System ix

Certification Information

DECLARATION OF CONFORMITY

Application of Council Directive(s): 73/23/EEC - The Low Voltage Directive

Manufacturer’s Name: EXFO ELECTRO-OPTICAL ENG. Manufacturer’s Address: 400 Godin Avenue

Equipment Type/Environment: Light Industrial Scientific Equipment Trade Name/Model No.: IQS-12004B DWDM Passive Components Test

Year of Conformity Assessment: 2002

Standard(s) to which Conformity is Declared:

EN 61010-1:1993/ A2:1995

EN 60825-1:1994 / A2: 2001 EN 55022: 1998 / A2: 2003 EN 61326:1997 / A3:2003

I, the undersigned, hereby declare that the equipment specified above conforms to the above Directive and Standards.

Manufacturer

Signature:

Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use, Part 1: General Requirements Safety of Laser products-Part 1: Equipment classification, requirement, and user’s guide. Limits and methods of measurement of radio disturbance characteristics of information technology equipment. Electrical Equipment for Measurement, Conttrol and Laboratory Use EMC Requirements

89/336/EEC - The EMC Directive

Quebec, Quebec Canada G1M 2K2 (418) 683-0211

System

Full Name: Stephen Bull, E. Eng Position: Vice-President Research and

Address: 400 Godin Avenue Quebec, Quebec,

Date: March 11, 2002

Development

Canada

x IQS-12004B

Certification Information

DECLARATION OF CONFORMITY

Application of Council Directive(s): 73/23/EEC - The Low Voltage Directive

Manufacturer’s Name: EXFO ELECTRO-OPTICAL ENG. Manufacturer’s Address: 400 Godin Avenue

Equipment Type/Environment: Industrial Scientific Equipment Trade Name/Model No.: Polarization State Adjuster Module

Standard(s) to which Conformity is Declared:

EN 61010-1:1993/ A2: 1995 Safety Requirements for Electrical Equipment for Measurement, Control,

EN 55022: 1998 / A2: 2003 Limits and M ethods of Measurement of Radio Disturbance

EN 61326:1997 / A3:2003 Electrical Equipment for Measurement, Control, and Laboratory Use –

I, the undersigned, hereby declare that the equipment specified above conforms to the above Directive and Standards.

Manufacturer

Signature:

Full Name: Stephen Bull, E. Eng Position: Vice-President Research and

Address: 400 Godin Avenue Quebec, Quebec,

Date: March 11, 2002

Development

Canada

and Laboratory Use, Part 1: General Requirements.

Characteristics of Information Technology Equipment.

EMC Requirements

89/336/EEC - The EMC Directive

Québec, Quebec Canada G1M 2K2 (418) 683-0211

IQS-51X0B

DWDM Passive Component Test System xi

Certification Information

DECLARATION OF CONFORMITY

Application of Council Directive(s): 73/23/EEC - The Low Voltage Directive

Manufacturer’s Name: EXFO ELECTRO-OPTICAL ENG. Manufacturer’s Address: 400 Godin Avenue

Equipment Type/Environment: Industrial Scientific Equipment Trade Name/Model No.: IQS-9401 Wavelength Reference Module Year of Conformity Assessment: 2002

Standard(s) to which Conformity is Declared:

EN 61010-1:1993/ A2: 1995 Safety Requirements for Electrical Equipment for Measurement,

EN 55022: 1998 / A2: 2003 Limits and Methods of Measurement of Radio Disturbance

EN 61326:1997 / A3:2003 Electrical Equipment for Measurement, Control, and Laboratory Use –

I, the undersigned, hereby declare that the equipment specified above conforms to the above Directive and Standards.

Manufacturer

Signature:

Full Name: Stephen Bull, E. Eng Position: Vice-President Research and

Address: 400 Godin Avenue Quebec, Quebec,

Date: March 11, 2002

Development

Canada

Control, and Laboratory Use, Part 1: General Requirements.

Characteristics of Information Technology Equipment.

EMC Requirements

89/336/EEC - The EMC Directive

Quebec, Quebec Canada G1M 2K2 (418) 683-0211

xii IQS-12004B

1 Introducing the IQS-12004B

DWDM Passive Component Test System

The IQS-12004B DWDM Passive Component Test System, an automated test solution for component manufacturers and system integrators, consists of a series of IQS modular test and measurement instruments that are completely integrated by an off-the-shelf software application. This revolutionary system rapidly analyzes important parameters to help you improve your production efficiency and decrease your product time to market.

Characterization of multiplexers, demultiplexers, filters, and other passive components is a critical step in ensuring the optimum performance of a wavelength-division multiplexing (WDM) system.

DWDM Passive Component Test System 1

Introducing the IQS-12004B DWDM Passive Component Test System

Step-by-Step Approach

The system performs DWDM component characterization and measures insertion loss, spectral uniformity, bandwidth, crosstalk, channel central wavelength, polarization dependence and optical return loss measurements on multiplexers, demultiplexers, filters, and other passive devices. These parameters must be controlled and tested throughout the entire life cycle of a component, from research and development through to production and even deployment.

The rapidity of the test procedure is achieved by scanning a very-low-noise tunable laser source (in this case the IQS-2600B or IQS-2600CT Tunable Laser Source) across the DUT’s spectral band while power is measured simultaneously on all device ports. Due to the medium coherence and unmatched sidemode suppression of the IQS-2600B/IQS-2600CT, a dynamic range of nearly 60 dB is easily attained.

The standard configuration includes IL and ORL measurements. Adding the IQS-5150 PSA will enable you to perform PDL measurements.

Step-by-Step Approach

Guided by your selection parameters, the software based on Windows 2000 controls the test procedure from start to finish. This systematic approach eliminates the possibility of data entry and reporting errors, and avoids costly procedural mistakes. In addition, time-saving features such as Pass/Fail testing, filter masks and a part number database simplify the job of DWDM component characterization.

2 IQS-12004B

Introducing the IQS-12004B DWDM Passive Component Test System

Test Features and Results

Each test step may be accessed either automatically or manually. Complete results are calculated at the end of the scan and are available both graphically and in a data table; values outside the defined test limits are highlighted. All data is saved to a database for archiving and future display or printing.

Create as many port types as you require. Once defined, they will be used to build a database of part numbers, enabling you to quickly reconfigure parameters simply by selecting the appropriate part number. The parameters in the port mask are used in the automatic Pass/Fail analysis.

Modularity and Flexibility

The system is built with the future in mind; the modular nature of the hardware and the flexibility of the software make it easy for you to upgrade or expand your test station. A single-channel system for measuring filters or gratings can be expanded to 32, 64, or more channels by simply adding the necessary plug-in modules. The system is also very compact: an entire 16-channel system, including PDL, will fit into a 4U (standard rackmount units) rackmount space.

DWDM Passive Component Test System 3

Introducing the IQS-12004B DWDM Passive Component Test System

System Overview

The IQS-12004B DWDM Passive Component Test System provides spectral insertion loss (IL), polarization-dependent loss (PDL), and optical return loss (ORL) measurements with high resolution and accuracy.

IQS-2600B or IQS-2600CT

Tunable Laser Source

IQS-5150

Polarization State Adjuster

IQS-9401

Wavelength Reference Module

Power Reference

ORL

Wavelength Reference

Device Under Test

IQS-1643T

The DWDM Passive Component Test System sweeps a very-low-noise tunable laser source across the spectral band of interest (C-band or C+L-band). While the source is sweeping, synchronized measurements from the Wavelength Reference Module (WRM) and the measurement power meters are acquired into the system software. At the end of the sweep, advanced signal processing is applied to the data, resulting in accurate IL, PDL, and ORL data.

This configuration ensures quick testing time that is practically independent of the number of device ports (there is a nominal data transfer and analysis penalty per channel). Because of the low source spontaneous emissions (SSE) of the IQS-2600B/IQS-2600CT Tunable Laser Source, a dynamic range of 60 dB is easily attained. The wavelength reference module ensures wavelength and loss accuracy by providing a fast and continuous wavelength and power reference throughout the sweep.

The numerous software features are explained later in this user guide.

4 IQS-12004B

Introducing the IQS-12004B DWDM Passive Component Test System

Testin g M a n y D e vices with the MultiPath Testing Option

Testing Many Devices with the MultiPath Testing Option

With the MultiPath Testing Option, you will be able to use the standard IQS-12004B DWDM Passive Component Test System along with an optical switch to perform tests on one or many DUTs with a variable number of In ports and Out ports.The MultiPath Testing Option provides:

³ A LabVIEW application that can be either used as is to perform

references, calibrations and tests, or can be tailored to your needs.

³ COM objects offering all the necessary properties and methods to build

your own multipath software.

The MultiPath Testing Option can be used for:

³ Environmental testing of DWDM passive components.

³ Testing arrayed components like variable optical attenuators (VOAs).

³ Testing multiplexers (IL, ORL, PDL, directivity).

³ Testing optical cross-connections (OXC) and other switches.

DWDM Passive Component Test System 5

Introducing the IQS-12004B DWDM Passive Component Test System

Hardware Components Description

Module Usage

IQS-510P Controller Unit Controls the measurement process as well as data

interpretation and storage. The controller unit is supplied with the necessary equipment for connection to a local area network (LAN). For more information, refer to the IQS-500 Intelligent Test System user guide.

IQS-510E Expansion Units Houses the instruments required by the system. If

necessary, a maximum of nine expansion units may be connected to the controller unit. For more information, refer to the IQS-500 Intelligent Test System user guide.

IQS-2600B or IQS-2600CT Tunable Laser Source

IQS-1643 Power Meter Allows DWDM filters and multiplexers characterization.

IQS-5150 Polarization State Adjuster (optional)

GPIB-controlled switch (optional)

For more information, refer to the IQ-2600 user guide or IQS-2600B Tunable Laser Source user guide.

For more information, refer to the IQS-1600 High-Speed Power Meter user guide.

Allows PDL measurements.

Allows to use the MultiPath Testing Option to perform tests on one or many DUTs with a variable number of In ports and Out ports.

6 IQS-12004B

Introducing the IQS-12004B DWDM Passive Component Test System

Tunable L aser Source

Tunable Laser Source

EXFO has modified its IQS-2600B Tunable Laser Source in order to integrate it into the IQS-12004B DWDM Passive Component Test System. To optimize the performance of the system, the optical attenuator which ensures a constant power output from the tunable laser source has been removed.

You can easily identify which tunable laser source you have. The unit designed for the DWDM Passive Component Test System bears the mention 2600CT, while the standalone unit bears the mention 2600B.

Every customer purchasing the IQS-12004B DWDM Passive Component Test System for applications covering both the C- and L-bands will receive an IQS-2600CT model. Even though the tunable laser source has been modified, it can still be used as a standalone instrument using an IQS-500 Intelligent Test System.

However, you will notice a warning message when turning the instrument on. This warning informs you that the automatic level control (ALC) is disabled. Also note that the power stability and repeatability values presented in the IQS-2600B specification sheet do not apply to the IQS-2600CT.

Any other functionality or specification, particularly those concerning the accuracy of the instrument and wavelength stability, will not be affected by this design change.

DWDM Passive Component Test System 7

Introducing the IQS-12004B DWDM Passive Component Test System

Module Description

This section describes the IQS-9401 Wavelength Reference Module and the IQS-5150 Polarization State Adjuster. For a description of the other modules used in the DWDM Passive Component Test System, refer to the modules’ user guides.

LED push button

lights up when the

controller unit is

turned on

In order to keep the optical ports clean, the protective caps should always be installed when the module is not being used.

OUT

IQS-5150

Polarization State Adjuster

IMPORTANT

Input port, UPC connector

Output port, UPC connector

Retaining screw knob

8 IQS-12004B

Introducing the IQS-12004B DWDM Passive Component Test System

Testin g Pro c e d u r e

Testing Procedure

The IQS-12004B DWDM Passive Component Test System prompts the operator to perform a series of steps, after which it controls the different IQS modules to perform measurements on a device under test (DUT).

The testing procedure used by the system is outlined below.

³ You can configure different test parameters in the Setup step.

³ System calibration is performed the first time the system is used. It can

also be performed as needed. Calibration comprises three elements: detector null measurement of power meters and the WRM, wavelength response calibration, and return loss calibration.

³ IL/PDL and ORL reference measurements are required each time the

system is turned on and are recommended whenever there is a significant change in environmental conditions.

³ The measurement scan(s) is performed. The insertion loss (IL)

measurement requires one scan, the IL/PDL measurement requires four scans, and the ORL measurement requires one scan.

³ At the end of the scan(s), the results are calculated and analyzed. You

can view the results and print reports as required.

DWDM Passive Component Test System 9

Introducing the IQS-12004B DWDM Passive Component Test System

Testin g Pro c e d u r e

Once a supervisor has configured the IQS-12004B DWDM Passive Component Test System, a typical test sequence would be similar to the flow chart shown below.

Open database

Perform a reference

Select DUT

Connect DUT

Measure

View results

Print report

Test another component

10 IQS-12004B

Introducing the IQS-12004B DWDM Passive Component Test System

Database Structure

The IQS-12004B DWDM Passive Component Test System uses several different databases for storing test results and configuration information. You have full control over the results database file name and location. The database structure is organized as shown below.

Customer.MDB

DUTPort.MDB

Results1.MDB

Results2.MDB

Results3.MDB

ResultsN.MDB

Scan data files

To save test results for later analysis, the IQS-12004B DWDM Passive Component Test System uses three databases:

³ Customer.MDB: This database contains information about your

customers. It is managed internally by the system.

³ DUTPort.MDB: This database contains Pass/Fail information about the

devices that you want to test. It is managed internally by the system.

³ ResultsN.MDB: This database contains test results. You can create as

many files as you want. For example, it might be practical to have different files for different customers, components, or test sessions. Basically, the system has built-in flexibility to let you choose the best way of saving test results.

DWDM Passive Component Test System 11

Introducing the IQS-12004B DWDM Passive Component Test System

Using GPIB or COM to Control the System

The IQS-12004B DWDM Passive Component Test System also uses scan data files. These files are the test results data files containing the IL vs. λ,

PDL vs. λ, and ORL vs. λ data. These files are created and managed by the DWDM Passive Component Test System. They are saved only if Save Results Curves is selected in the System Settings window.

When you create a new database in the system, you are creating only a new ResultsN database. The customer and DUT information that you previously entered in the first two databases (Customer and DUTPort) will be available for the new ResultsN database.

If you need information or details about the database structure, please contact EXFO (see Contacting the Technical Support Group on page 223).

Using GPIB or COM to Control the System

The IQS-12004B DWDM Passive Component Test System gives you the opportunity to develop your own applications using either SCPI commands (GPIB control) or COM objects.

The MultiPath Testing Option allows you to develop your tailored applications using COM objects.

In order to be able to take IL, ORL, and PDL measurements with the standard DWDM Passive Component Test System or the MultiPath Testing Option, there are a number of required steps and procedures to follow.

12 IQS-12004B

Introducing the IQS-12004B DWDM Passive Component Test System

A typical test sequence would be similar to the flow chart below.

Standard IQS-12004B DWDM Passive Component Test System (one DUT at a time)

Using GPIB or COM to Control the System

Initialize hardware

Null power meter

Optimize power

Calibrate system

IL/PDL

ORL

Reference system

IL/PDL

ORL

MultiPath Testing option (possibility of several DUTs at a time)

Te s t D UT

Retrieve results

Tes t D UT

h c t

Select input port

w s

e h

Measure/analyze

g n

i s

u g

l c y

Retrieve data

Each time a new test sequence is started, the above steps are required or highly recommended. In some cases, the system will generate error messages where the prerequisite steps have not been performed.

DWDM Passive Component Test System 13

Introducing the IQS-12004B DWDM Passive Component Test System

Conventions

Before using the product described in this manual, you should understand the following conventions:

WARNING

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. Do not proceed unless you understand and meet the required conditions.

CAUTION

Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. Do not proceed unless you understand and meet the required conditions.

CAUTION

Indicates a potentially hazardous situation which, if not avoided, may result in component damage. Do not proceed unless you understand and meet the required conditions.

IMPORTANT

Refers to information about this product you should not overlook.

14 IQS-12004B

2 Safety Information

Laser Safety Information

WARNING

Do not install or terminate fibers while a light source is active. Never look directly into a live fiber and ensure that your eyes are protected at all times.

WARNING

Use of controls, adjustments and procedures for operation and maintenance other than those specified herein may result in hazardous radiation exposure.

Safety Information

Your instrument is a Class 1 laser product in compliance with standards IEC 60825-1 Amendment 2: 2001 and 21 CFR 1040.10. Laser radiation may be encountered at the output port.

The following label indicates that a product contains a Class 1 source:

CLASS 1

LASER PRODUCT

Note: Label shown for information purposes only. It is not affixed to your product.

The DWDM Passive Component Test System may be equipped with the IQS-2600B or the IQS-2600CT tunable laser sources. For more information on these modules, refer to the IQS-2600B Tunable Laser Source user guide.

DWDM Passive Component Test System 15

3 Getting Started with Your

DWDM Passive Component Test System

This chapter contains a description of hardware components and modules used in the system, information on how to install hardware components and how to install and start the IQS-12004B DWDM Passive Component Test System software. You will also find a description of the utility to organize test files as well as a description of the application main window.

Inserting and Removing Test Modules

CAUTION

Never insert or remove a module while the controller unit and its expansion units are turned on. This will result in immediate and irreparable damage to both the module and unit.

To insert a module into the controller or expansion unit:

1. Exit IQS Manager and turn off all your units.

2. Remove the protective cover from the desired unused module slot.

2a. Pull the retaining screw knob firmly towards you and release the

bottom of the cover.

2b. Gently pull the top of the protective cover downwards, to remove

it from the unit grooves.

DWDM Passive Component Test System 17

Getting Started with Your DWDM Passive Component Test System

Inserting and Removing Test Modules

Protective cover

Retaining screw

knob

3. Position the module so that its front panel is facing you and the top and bottom protruding edges are to your right.

4. Insert the protruding edges of the module into the grooves of the unit’s module slot.

Protruding edges (right side of module)

Retaining screw knob

Retaining screw

18 IQS-12004B

Getting Started with Your DWDM Passive Component Test System

Inserting and Removing Test Modules

5. Push the module all the way to the back of the slot, until the retaining screw makes contact with the unit casing.

6. While applying slight pressure to the module, turn the retaining screw knob (located at the bottom of the panel) clockwise until the knob is horizontal. This will secure the module into its “seated” position.

The module is correctly inserted when its front panel is flush with the front panel of the controller or expansion unit.

When you turn on the controller unit, the startup sequence will automatically detect your module.

Note: You can insert IQ modules into your controller or expansion unit; the IQS

Manager software will recognize them. However, the IQS-500 locking mechanism (retaining screw) will not work for IQ modules.

To remove a module from your controller or expansion unit:

1. While pulling gently on the knob, turn it counterclockwise until it stops.

The module will slowly be released from the slot.

DWDM Passive Component Test System 19

Getting Started with Your DWDM Passive Component Test System

Inserting and Removing Test Modules

Retaining screw knob

2. Place your fingers underneath the module or hold it by the retaining screw knob (NOT by the connector) and pull it out.

Connector

YES

Retaining screw

knob

20 IQS-12004B

Getting Started with Your DWDM Passive Component Test System

Inserting and Removing Test Modules

CAUTION

Pulling out a module by a connector could seriously damage both the module and connector. Always pull out a module by the retaining screw knob.

3. Cover empty slots with the supplied protective covers. Simply slide the top of the protective cover into the upper grooves of the unit, and then snap into place by pushing the retaining screw knob.

CAUTION

Failure to reinstall protective covers over empty slots will result in ventilation problems.

DWDM Passive Component Test System 21

Getting Started with Your DWDM Passive Component Test System

Installing Hardware Components

The DWDM Passive Component Test System has been configured and tested at the factory, under normal conditions, and installed by an EXFO authorized installation engineer. The following information is provided in the event that it is necessary to move, transport, or reinstall the system.

Controller and Expansion Units

Please refer to the IQS-500 Intelligent Test System user guide for detailed information about installing and connecting the controller and expansion unit(s).

Source, Wavelength Reference, and PSA

The source (IQS-2600B or IQS-2600CT), the wavelength reference module (IQS-9401), and the optional polarization state adjuster (IQS-5150) must be installed in the same expansion unit and in a specific order.

The recommended configurations are presented hereafter.

CAUTION

Never insert or remove a module while the controller or expansion unit is turned on. This will result in immediate and irreparable damage to both the module and unit.

22 IQS-12004B

Getting Started with Your DWDM Passive Component Test System

Installing Hardware Components

Configuration with PDL

Connect the tunable output of the IQS-2600B/IQS-2600CT to the input of the IQS-5150 using the rigid patchcord supplied with the IQS-2600B/IQS-2600CT. Connect the output of the IQS-5150 to the input of the IQS-9401, as illustrated below.

OUT

IQS-9401

Wavelength Reference Module

Sync Out

ACTIVE

IQS-2600CT

Tunable Laser Source

OUTPUT

MONITOR OUTPUT

TRIG IN

TRIG OUT

OUT

IQS-5150

Polarization State Adjuster

Connect the launch fiber to the output of the IQS-9401.

Note: The IQS-9401 has an angled (APC) output connector.

DWDM Passive Component Test System 23

Getting Started with Your DWDM Passive Component Test System

Installing Hardware Components

Configuration without PDL

Connect the tunable output of the IQS-2600B/IQS-2600CT to the input of the IQS-9401 using the rigid patchcord supplied with the tunable source, as illustrated below.

OUT

IQS-9401

Wavelength Reference Module

Sync Out

ACTIVE

IQS-2600CT

Tunable Laser Source

OUTPUT

MONITOR OUTPUT

TRIG IN

TRIG OUT

Connect the launch fiber to the output of the IQS-9401.

Note: The IQS-9401 has an angled (APC) output connector.

24 IQS-12004B

Getting Started with Your DWDM Passive Component Test System

Installing Hardware Components

Configuration of Power Meters

The IQS-1643T power meters must be installed sequentially in the unit. Use the short synchronization cables to connect power meters in the same unit, and the long synchronization cables to connect power meters in different units. It is also necessary to install a synchronization cable between the IQS-9401 and the first power meter, as illustrated below.

ACTIVE

IQS-2600CT

Tunable Laser Source

OUTPUT

MONITOR OUTPUT

TRIG IN

TRIG OUT

OUT

IQS-5150

Polarization State Adjuster

OUT

IQS-9401

Wavelength Reference Module

SYNC OUT

Sync Out

IQS-1600T

4-Ch Power Meter

Sync In Trig

SYNC IN

Sync Out

IQS-1600T

4-Ch Power Meter

Sync In Trig

Sync Out

IQS-1600T

4-Ch Power Meter

Sync In Trig

Sync Out

IQS-1600T

4-Ch Power Meter

IMPORTANT

The power meters must be correctly installed and configured before starting IQS Manager or before turning the unit on. If modules need to be repositioned, you will have to restart the system.

IMPORTANT

To keep the optical ports clean, ensure that protective caps are always installed when the module is not being used.

Sync

Out Sync In Trig

DWDM Passive Component Test System 25

Getting Started with Your DWDM Passive Component Test System

Installing Hardware Components

To work with the MultiPath Testing Option, you will have to add a switch to your standard IQS-12004B DWDM Passive Component Test System to benefit from its inherent features.

CAUTION

Never insert or remove a module while the controller or expansion unit is turned on. This will result in immediate and irreparable damage to both the module and unit.

The minimum hardware components required for multipath testing are:

³ Tunable laser source (IQS-2600B or IQS-2600CT).

³ Wavelength reference module (IQS-9401).

³ Power meter (IQS-1643T), one or more.

³ Switch (either the IQS-9100, or a GPIB-controlled switch. Check with

EXFO to see if a specific model is supported.).

Regardless of whether you will be using an EXFO switch or any of the supported switches, the connection of the switch in the system will remain the same.

The switch has to be connected to the Wavelength Reference Module () and to the power meters. Use the supplied to link the Out port of the WRM to the common port of the switch. Connect the DUT(s) between the power meter and the switch.

26 IQS-12004B

Getting Started with Your DWDM Passive Component Test System

Installing Hardware Components

To work in high-power mode, you will have to add a switch and an EDFA

to your standard IQS-12004B DWDM Passive Component Test System.

IMPORTANT

In order to be able to control the EDFA, the GPIB address of the EDFA must be smaller than the GPIB address used for the switch.

CAUTION

Never insert or remove a module while the controller or expansion unit is turned on. This will result in immediate and irreparable damage to both the module and unit.

The minimum hardware components required for multipath testing in high mode are:

³ Tunable laser source (IQS-2600B or IQS-2600CT).

³ Wavelength reference module (IQS-9401).

³ Power meter (IQS-1643T), one or more.

³ The KPS-AMP-C-20 fiber amplifier (EDFA).

³ A high-power GPIB-controlled switch.

DWDM Passive Component Test System 27

Getting Started with Your DWDM Passive Component Test System

Installing the IQS-12004B DWDM Passive Component Test System Software

For the DWDM Passive Component Test System to function properly, the IQS Manager software must be installed on your IQS-500 Intelligent Test System.

Normally, you wouldn’t have to install the IQS Manager software or the DWDM Passive Component Test System software, except in particular circumstances (such as after having reinstalled Microsoft Windows).

For information on installing IQS Manager software, refer to the IQS-500 Intelligent Test System user guide.

To install the DWDM Passive Component Test System on an IQS-500 controller unit:

1. Insert CD of the DWDM Passive Component Test System in the CD-ROM

drive.

2. Select Run from the Windows Start menu.

3. Ty pe F:\ setup.exe in the Open text field.

4. Click OK to start the wizard and follow the on-screen instructions.

28 IQS-12004B

Getting Started with Your DWDM Passive Component Test System

Installing the MultiPath Testing Option Software

Before installing the MultiPath Testing Option software, ensure that the IQS-12004B DWDM Passive Component Test System software has been installed on the IQS-500 controller unit. For more information, see Installing the IQS-12004B DWDM Passive Component Test System Software on page 28.

To install the MultiPath Testing software on an IQS-500 controller unit:

1. Insert the MultiPath Testing software CD-ROM in the drive.

2. Select Run from the Windows Start menu. The Run window appears.

3. Use the Browse button to find the setup.exe file on the CD-ROM.

4. Click OK to start the installation.

EXFO recommends that you keep the default names and paths suggested by the setup program.

Follow the on-screen instructions. Once the LabVIEW demo is installed, the installation of the files required to run LabVIEW will begin.

DWDM Passive Component Test System 29

Getting Started with Your DWDM Passive Component Test System

Installing the MultiPath Testing Option Software

If the following dialog box appears, that means that LabVIEW has been installed in a previous session.

If this is the case, choose Modify, click Next and follow the on-screen instructions.

IMPORTANT

Selecting an option other than Modify may prevent the MultiPath Test i ng Op t ion software from working properly.

For information on how to use the MultiPath Testing Option application, see Testing Multiple DUTs with the LabVIEW Application on page 117.

30 IQS-12004B

Getting Started with Your DWDM Passive Component Test System

Starting and Exiting the DWDM Passive Component Test System Application

To start the DWDM Passive Component Test System application:

³ On the Windows taskbar, click Start, select Programs > EXFO >

IQS-12004B > IQS-12004B DWDM Test System.

³ Double-click the IQS-12004B DWDM Test System desktop icon.

To exit the DWDM Passive Component Test System application:

Select Exit from the File menu.

At the starting of the application, a message may appear, indicating that the regional settings of your system were temporary changed. This change consists in using a period for the decimal symbol and using the YYYY-MM-DD date style.

DWDM Passive Component Test System 31

Getting Started with Your DWDM Passive Component Test System

Starting and Exiting the DWDM Passive Component Test System Application

By default, the Welcome/New Test window appears first when you start the DWDM Passive Component Test System (see Opening a New Test Database on page 61).

The Welcome/New Test window gives you the possibility to open a new test database, to open an existing test database, or to view the content of recent test databases.

32 IQS-12004B

Menu bar

Getting Started with Your DWDM Passive Component Test System

Starting and Exiting the DWDM Passive Component Test System Application

Clicking Cancel takes you to the application main window, as shown on the figure below.

The DWDM Passive Component Test System main window is the central location from where you access all functionalities.

Title bar

Function buttons

Position of modules in IQS unit

Status bar

Details the procedure in progress

DWDM Passive Component Test System 33

Getting Started with Your DWDM Passive Component Test System

Accessing a Specific Test Step

During the step-by-step procedure, it is possible to access the Te s t Steps dialog box to manually go to a specific step via the Step button from the main window.

To p r o cee d w ith the current step

To s k i p th e

current step

34 IQS-12004B

Getting Started with Your DWDM Passive Component Test System

Starting and Exiting the MultiPath Testing Option Application

You may want to use the provided LabVIEW application to work with the MultiPath Testing option .

To start the LabVIEW application:

³ On the Windows taskbar, click Start, select Programs > EXFO >

IQS-12004B > IQS-12004B Multi Path DWDM Test System.

³ Double-click the IQS-12004B MPT desktop icon.

The application main window is displayed.

To close the application, select Exit from the File menu.

DWDM Passive Component Test System 35

4 Setting Up the DWDM Passive

Component Test System

The DWDM Passive Component Test System has been designed to let you define DUTs and optical ports that can be used for future tests.

Configuring DUT Parameters for Pass/Fail Analysis

Note: You must be working at the Supervisor level to access this window.

The DUT Configuration window allows you to define specific parameters for the optical ports and DUTs you will be testing. Information entered in this window is used to construct and maintain two internal lists: one for port types and one for DUTs. These two lists provide an efficient way of identifying the Pass/Fail limits for all your commonly tested components.

The relationship between optical ports and DUTs is illustrated below. In this example, the DUT is a four-channel device with one common port and four output ports.

Port 1 (200 GHz bandpass)

1x4 Demultiplexer (DUT)

To identify the Pass/Fail criteria for this type of component, you must define the different parameters (IL, PDL, BW, etc.) for each port. In most cases, the characteristics for all ports will be identical, except for the wavelength.

The most efficient way of describing the above device would be to create a port (200 GHz bandpass) and define all its Pass/Fail criteria. When you define the DUT, you simply have to select a port type for each output and assign a wavelength to the port mask. This 200 GHz bandpass port will also be used for defining other devices. There is no practical limit to the number of different ports or DUTs that can be defined.

DWDM Passive Component Test System 37

Port 2 (200 GHz bandpass)

Port 3 (200 GHz bandpass)

Port 4 (200 GHz bandpass)

Setting Up the DWDM Passive Component Test System

Configuring DUT Parameters for Pass/Fail Analysis

This window can be accessed via the Configure DUTs icon from the Welcome/New Test window. For information on how to display this

window, see Opening a New Test Database on page 61.

³ Optical Ports Configuration: This section contains the list of all

configured ports. You can add new ports (click Add), modify the port indicated in the Port Type list box (click Modify), or delete an existing optical port (click Delete).

For information about the configuration of an optical port type, see Configuring an Optical Port on page 39.

³ DUT Configuration: This section allows you to configure DUTs based

on the optical port types. You can add new DUTs (click Add), modify the DUT indicated in the Part Number list box (click Modify), or delete an existing DUT (click Delete).

For information about the configuration of a DUT, see Configuring a DUT on page 42.

38 IQS-12004B

Setting Up the DWDM Passive Component Test System

Configuring an Optical Port

Note: You must be working at the Supervisor level to access this window.

This window can be accessed via the Configure DUTs icon from the Welcome/New Test window. For information on how to display this

window, see Opening a New Test Database on page 61.

When you click Add or Modify in the Optical Ports Configuration section, the following window appears where you can enter or modify port information. For details about the parameters contained in this window, see Definitions and Calculation Methods on page 405.

Note: Some parameters can be disabled (grayed out) when you select a certain

mask type.

³ Port Type: Use this text box to give a unique name to the optical port

defined.

³ Mask Type: This list box allows you to select one of two different mask

types (bandpass and notch).

DWDM Passive Component Test System 39

Setting Up the DWDM Passive Component Test System

Configuring an Optical Port

The Spectral Parameters section is used to specify the limits or the acceptable values that will determine the Pass/Fail result of the tests.

³ BW1, BW2, and BW3: These text boxes allow you to specify the relative

power levels (in dB) at which bandwidth is tested, and the acceptable bandwidth (in nm). Note that only BW2 and BW3 are tested when the Defined Bandwidth calculation method is selected.

³ BWx Tolerance: These text boxes allow you to specify the tolerance

interval for the bandwidth test. For a DUT to pass this test, the measured BWx value must fall within BWx ±BWx tolerance.

³ Wavelength Tolerance: This text box is used to enter the central

wavelength tolerance of the specified port. This test is not performed when the Defined Bandwidth calculation method is selected.

The Loss Parameters section is used to specify the flatness, crosstalk, rejection as well as the IL, ORL and PDL values.

³ Flatness: This text box is used to enter the acceptable flatness (in dB)

of the curve in the measured BW1 interval.

³ Crosstalk: This text box allows you to enter the acceptable channel

crosstalk (in dB) for the DUT. This option is disabled (grayed out) when the notch mask type is selected.

³ Rejection: This text box allows you to enter the acceptable rejection

level (in dB) for the DUT. This option is disabled (grayed out) when the bandpass mask type is selected.

³ IL: This field allows you to specify the acceptable insertion loss value

(dB).

³ ORL: This field allows you to specify the ORL limit value (dB).

³ PDL: This field allows you to specify the PDL limit value (dB).

40 IQS-12004B

Setting Up the DWDM Passive Component Test System

Configuring an Optical Port

The Calculation Method Based On section is used to select which method will be used to calculate some of the different test results. For details about these methods, see Definitions and Calculation Methods on page 405.

³ Measured Bandwidth: This option allows BW1 to be determined from

the measured data.

³ Defined Bandwidth: This option allows you to define BW1 yourself.

When selecting defined bandwidth, you will enter the defined bandwidth in the BW1 box. During the data analysis, the software will use the CW ±BW1/2 as the analysis range for IL, crosstalk, ripple, etc.

DWDM Passive Component Test System 41

Setting Up the DWDM Passive Component Test System

Configuring a DUT

Note: You must be working at the Supervisor level to access this window.

This window can be accessed via the Configure DUTs icon from the Welcome/New Test window. For information on how to display this

window, see Opening a New Test Database on page 61.

Once the optical ports are correctly defined, you can configure DUTs based on these ports. When clicking Add or Modify in the DUT Configuration section, the following window appears where you can enter or modify information about the DUT.

In the upper section of the DUT Configuration window, you enter identification and test parameters. These parameters will automatically be selected when performing a scan on a defined device.

Note: Once a device has been created, the Number of Ports cannot be modified.

³ Part Number: the part number for the DUT.

³ Description: a short description of the DUT.

³ Manufacturer: the name of the manufacturer.

42 IQS-12004B

Setting Up the DWDM Passive Component Test System

Configuring a DUT

³ Analysis from X nm to Y nm: the default range of the analysis. The

analysis limits can be modified later in the IQS-12004B Setup window.

³ Number of Ports: the number of ports, excluding the common port.

³ Port Number: In this list box, you select the port for which you will

configure the type and central wavelength. You can also use the Previous and Next buttons to move from one port to another.

³ Port Type: In this list box, you select the type of port from the list of

available ports that you configured previously. Usually for a device, all ports are of the same type, but this is not always the case; and the software allows you to configure devices with different port types. For more information, see Configuring an Optical Port on page 39.

³ Center Wavelength: You can specify a wavelength yourself (using the

Specified Wavelength option button), or select one of the ITU wavelengths from the list (using the From List option button). The ITU wavelength values correspond to the list defined in the Channel List dialog. For more information, see Customizing the Channel List on page 46.

³ ORL Analysis: Select this option to perform an ORL analysis.

³ The PDL Analysis section allows you to select options for PDL testing.

³ If you intend to export detailed IL results, check the

Keep IL traces for all states of polarization (4) box.

³ If you need to get the results from the polarization-dependent

wavelength analysis, check the Polarization Dependent Wavelength box.

Note: These two options can also be selected when you set the test parameters.

For more information, see Preparing the Test Setup on page 49. If you omit to check the boxes, you won’t be able to export the corresponding traces. For more information on exporting, see Exporting Data on page 94.

³ Center Wavelength: The PDL value is taken at the central wavelength

for each port.

DWDM Passive Component Test System 43

Setting Up the DWDM Passive Component Test System

Configuring DUT Company/Customer Parameters

³ Operating Wavelength Range: The highest PDL value in the BW1

range is taken.

³ Relative Range (CW)±X nm: allows you to indicate the highest PDL

value in the relative range ± X nm.

³ From X nm to Y nm: allows you to indicate the highest PDL value

between X nm and Y nm.

Click OK to add the DUT to the list of available components to test.

Configuring DUT Company/Customer Parameters

Note: You must be working at the Supervisor level to access this window.

The Company/Customer Configuration window contains identification and system information including the name of the company (organization performing the tests) and the customer (organization for which the tests are performed).

All this information is saved in a database and is useful for documentation and traceability purposes.

To access the Company/Customer Configuration window:

From the Configuration menu, select Company/Customer Configuration.

44 IQS-12004B

Setting Up the DWDM Passive Component Test System

Configuring DUT Company/Customer Parameters

³ Company Information: This section indicates the name of the

company performing the tests. You can modify the information by clicking Modify.

³ Customer List: This section allows you to enter data about the

different customers. You can add new customers to the database (click Add), modify a customer indicated in the list box (click Modify), or delete an existing customer (click Delete). When clicking Add or Modify, the following window appears where you can enter or modify customer information.

DWDM Passive Component Test System 45

Setting Up the DWDM Passive Component Test System

Customizing the Channel List

Note: You must be working at the Supervisor level to use this feature.

This feature allows you to view and customize the channel list, which contains predefined ITU wavelengths. New wavelengths can also be added to this list. The DWDM Passive Component Test System displays the channel list when a choice of wavelength is required.

The number of digits displayed after the decimal point can be changed to better suit your needs.

You can access the Channel List window by selecting Channel List from the Options menu.

To modify the number of digits displayed after the decimal point:

Use the Decimal Places box to set the desired value.

Number of digits after decimal point

46 IQS-12004B

Setting Up the DWDM Passive Component Test System

Customizing the Channel List

To modify the ITU channel list display:

1. In the Channel Spacing box, select the space value (in GHz) between

the channels of the DUT.

2. In the Start Wavelength and End Wavelength boxes, enter the values that will determine the wavelength range that will be displayed on the list.

3. Confirm your changes with Apply.

To add a new wavelength to the list:

1. Enter the new wavelength in the Wa velength text box. The number of

decimals depends on the value set in the Decimal Places box.

2. Click Add. Your new channel will be added to the list.

DWDM Passive Component Test System 47

Setting Up the DWDM Passive Component Test System

Customizing the Channel List

To delete wavelengths from the list:

If you want to delete a specific item, click the value you want to remove from the wavelength list and click Remove.

If you want to empty the list, click the Remove All button.

Once you are done with the changes, click OK to validate the new list or on Cancel to discard the modifications.

48 IQS-12004B

Setting Up the DWDM Passive Component Test System

Preparing the Test Setup

Before performing a test, you have to specify the parameters to be used.

The application offers you two types of tests:

³ Generic: Useful to quickly test a DUT by using the default values

provided. Some analysis can be done with this option, but no Pass/Fail status will be given.

³ Specified: Useful to perform a test using predefined parameters and

Pass/Fail limits. When selecting this test, the DUT Identification group box is displayed (see Identifying the Current DUT on page 54).

You can specify the values for the scan parameters to be taken into account during tests. These values include:

³ The number of channels to be tested: By default, the application

displays the total number of available power meter channels. However, if you do not intend to work with all of the available channels, EXFO recommends that you indicate the actual number of channels you are using. This will save some testing time and a lot of disk storage space.

³ The tested wavelength range (in nm): By default, the application

displays the full range of the source in use. Changing this to a smaller range will save disk storage space and may also reduce testing time.

DWDM Passive Component Test System 49

Setting Up the DWDM Passive Component Test System

Preparing the Test Setup

³ The scan resolution (in pm): This parameter determines the

approximate scan resolution. The application will set the appropriate source sweep speed and power meter sampling rate.

The application allows you to indicate the test selection:

³ PDL: calculations, based on the Mueller Matrix four-state method, take

into account the optical retardation of the polarization state adjuster (IQS-5150).

³ Simplified PDL: faster than standard PDL (calculations do not take into

account the optical retardation of the polarization state adjuster), but adds an uncertainty of about 5 % of the DUT PDL.

³ ORL.

You can specify the IL analysis parameters, the PDL analysis parameters and whether the system must perform a continuous scan or not.

The DWDM Passive Component Test System performs PDL measurements as function of wavelength. It can also keep intermediate traces for export purposes.

The result table will be adjusted according to the options specified in the PDL Analysis group box.

³ In addition to standard IL results (DUT IL average values), you may

need to get IL results obtained at the four states of polarization.

³ You may also need to get traces from the PDW analysis. The PDW

analysis is made using proprietary algorithms (patent pending) and is based on calculations using the Mueller Matrix coefficients. Using data from the four scans performed for the PDL measurement, the DWDM Passive Component Test System analysis software internally calculates the transmission response for many states of polarization and generates the insertion loss curves for the extreme values.

Note: The test setup step is only available when you have already created a test.

50 IQS-12004B

Setting Up the DWDM Passive Component Test System

Preparing the Test Setup

To set the test parameters:

1. Ensure that the IQS-12004B Setup window is open. For more

information on selecting a step, see Accessing a Specific Test Step on page 34.

2. From the Test Ty p e group box, select Generic or Specified test.

3. From the Scan Parameters group box, specify the required

parameters.

3a. Indicate the number of power meter channels to use by typing the

value in the Channel(s) entry box.

3b. Specify the wavelength range (in nanometers) that will be used

for the analysis in the Analysis from X nm to Y nm entry boxes.

IMPORTANT

When testing “specified” devices, changing the wavelength range parameter will override the parameter stored in the DUT database.

Note: Setting a smaller scan range will reduce the database size, the time

required for the analysis and for the scan.

3c. Select the scan resolution value (in picometers) from the

Resolution list.

Note: Resolution cannot be set to 5 pm when using the IQS-2600B source.

DWDM Passive Component Test System 51

Setting Up the DWDM Passive Component Test System

Preparing the Test Setup

4. If you need the DWDM Passive Component Test System to perform successive scans,

4a. Check the box from the Continuous Scan group box.

4b. Enter the number of scans you want to perform in the

corresponding text field.

5. From the Test S e l ec tion group box, check the PDL, Simplified PDL and/or ORL boxes according to the measurements you want to perform.

6. From the IL Analysis group box, specify the relative power levels (in dB) at which the bandwidth is calculated (for notch and bandpass filters).

52 IQS-12004B

Setting Up the DWDM Passive Component Test System

Preparing the Test Setup

7. From the PDL Analysis group box, specify the required parameters.

For more information on the various parameters, see Configuring a DUT on page 42.

Note: If you omit to check the Keep IL traces for all states of polarization (4)

box, you won’t be able to export these traces. For more information on exporting, see Exporting Data on page 94.

Note: If you omit to check the Polarization Dependent Wavelength box, you

won’t be able to export these traces. For more information on exporting, see Exporting Data on page 94.

8. If you selected Specified for the test type, the DUT Identification group box is displayed. Use this section to select and identify the device that will be tested. For more information, see Identifying the Current DUT on page 54.

Note: At start-up, your access level is activated by default. For more information

about access levels, see Working with Access Levels on page 59.

DWDM Passive Component Test System 53

Setting Up the DWDM Passive Component Test System

Identifying the Current DUT

The DUT Identification is used to select and identify the device that will be tested next. The DUT Identification group box is accessible from the IQS-12004B Setup window and by selecting the Specified test type.

³ Part Number : This list box is used to select the part number of the DUT.

The available DUTs were previously created in the DUT Configuration window. For information on DUT creation, see Configuring a DUT on page 42.

³ Description: This text box shows the short description of the DUT

corresponding to the selected part number.

³ Customer: This list box is used to select the name of the customer

associated with the current DUT. For information on modifying the list of customers, see Configuring DUT Company/Customer Parameters on page 44.

³ Test e d by : This text field allows you to identify the name of the person

doing the current test.

³ Serial Number: This text field is used to identify the DUT with a serial

number. The serial number is mandatory.

³ Batch: This text field allows you to specify a batch number.

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Setting Up the DWDM Passive Component Test System

Identifying the Current DUT

Two buttons are available on the right side of the window to enter and view additional information about the DUT.

³ Show Limits: This button will open the Optical Port Limits window

(see figure below), where you can see different limits of the current DUT. These parameters were set in Supervisor level on the DUT

Configuration window. For more details, see Definitions and Calculation Methods on page 405 or Configuring DUT Parameters for Pass/Fail Analysis on page 37.

³ Additional Comments: This button will open a text window, where

you can enter additional comments about the current DUT.

DWDM Passive Component Test System 55

Setting Up the DWDM Passive Component Test System

Modifying System Settings

Note: You must be working at the Supervisor level to use this feature.

The System Settings window allows you to define two saving options, set filtering options, and select a new database folder. To access this window, from the main window menu, select Options > Supervisor Options > System Settings.

³ Save Raw Data: This is a troubleshooting tool that allows EXFO

technical support to troubleshoot data analysis problem. This option is normally not selected as it uses a large storage space.

³ Save Results Curves (IL, PDL, ORL): This option is selected by

default. If not selected, you will only be able to see the results table (not the trace) and the trace data will not be saved.

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Setting Up the DWDM Passive Component Test System

Modifying System Settings

³ Enable Auto-Range Filtering: This option is selected by default. When

selected, the software signal processing identifies and filters out any invalid datapoints that sometimes occur at power meter autoranging scale changes.

When not selected, no post process filtering is applied. A small improvement in testing time will be observed. When the filtering is not applied, data spikes between 0 and 0.030 dB may be observed at some scale changes.

³ Use Simplified Method: This option is selected by default. It indicates

that the PDL simplified method will be used for each test. Simplified PDL is faster than “standard” PDL (calculations do not take into account the optical retardation of the polarization state adjuster), but adds an uncertainty of about 5 % of the DUT PDL.

³ Folders: This feature allows you to specify paths for the different

databases.

DWDM Passive Component Test System 57

5 Operating the DWDM Passive

Component Test System

Working with Access Levels

The IQS-12004B DWDM Passive Component Test System comprises two levels of operation: User and Supervisor. The level at which the application is working is shown in the title bar.

Note: When starting the application, the User level is always the default level of

operation, even if you last exited the application at the Supervisor level.

User Level

At the User level, you can perform complete tests on passive components and create new database files. However, certain functions are disabled.

To switch from Supervisor level to User level, select Level of Operation, then User, from the Options menu. A check mark will appear in the menu.

Supervisor Level

The Supervisor level gives you access to all DWDM Passive Component Test System functions. As a Supervisor you can:

³ Configure the DUTs. For details about this feature, see Configuring DUT

Parameters for Pass/Fail Analysis on page 37.

³ Modify system settings. For details about this feature, see Modifying

System Settings on page 56.

³ Modify ITU channel list. For details about this feature, see Customizing

the Channel List on page 46.

To switch from User level to Supervisor level:

1. From the main widow menu, select Options >Level of Operation >

Supervisor.

2. Enter the requested password. The default password is VISUALIQ.

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Operating the DWDM Passive Component Test System

Working wit h A c c e s s L ev e l s

It is also possible to directly log on at the Supervisor level when creating a new test database.

To log on at the Supervisor level:

1. From the Welcome/New Test window, check the Supervisor box.

2. Press the Password button. The Supervisor Level window is

displayed.

3. Type your password and press OK.

You can later change your password in the Options menu. For details, see Changing Supervisor Password on page 60.

Changing Supervisor Password

IMPORTANT

Under Windows 2000, you must have Administrator rights to modify the supervisor password.

To change the password once you are at the Supervisor level:

1. From the main window menu, select Options >

Supervisor Options> Change Password. The following window appears:

2. Enter the old password and then enter the new password twice.

Note: Passwords must be between six and ten characters long.

3. Click OK to save the new password.

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Operating the DWDM Passive Component Test System

Opening a New Test Database

IMPORTANT

To help you copy and move the database and also prevent data corruption, save your tests in several databases and keep the results database to a manageable size.

To open a new test database:

1. From the Welcome/New Test window, select the New Test tab.

DWDM Passive Component Test System 61

Operating the DWDM Passive Component Test System

Opening a New Test Database

2. Select the icon for the type of test you want to perform:

³ IL measures the insertion loss.

³ IL+ORL measures both the insertion loss and the optical

return loss.

³ IL+PDL measures both the insertion loss and the

polarization-dependent loss.

³ IL+ORL+PDL measures the insertion loss, the optical return loss,

and the polarization-dependent loss in the same test.

³ Configure DUTs allows you to configure the optical ports and the

DUT (see Configuring an Optical Port on page 39 and Configuring a DUT on page 42). This option is enabled only if you have selected the Supervisor level of operation and provided a valid password.

You can later change the types of test you want to perform in the Setup window, under Test Selection.

Note: Certain tests may not be available if the required modules are not present.

If this is the case, the icons will be grayed out.

3. If you want to work at the Supervisor level, enter a password in the

Supervisor box. For more information, see Working with Access Levels on page 59. As a supervisor, you can modify system settings (see Modifying System Settings on page 56).

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Operating the DWDM Passive Component Test System

Opening a New Test Database

4. Press New. The Open New window is displayed.

IMPORTANT

If you use the name of an already-existing test for a new database, the data related to this test will be lost (the file will be overwritten). If you want the new data to be appended to the existing database, see Opening an Existing Test Database on page 64.

Give a name to the new database and click Open. The database opens and you are brought to the IQS-12004B Setup window.

Note: To proceed directly, you can double-click the icon for the type of test you

want to perform. You can also access this function by selecting New Database from the File menu.

If new hardware components were installed on the system, message windows will appear indicating that a new system calibration and a new ORL calibration will have to be performed. For details, see Calibrating the System on page 73.

Database files can be stored in any directory, either on a local drive or network drive. The database files must have the .MDB extension, which is the standard Microsoft Access database file format.

IMPORTANT

It is important to wait 30 minutes for the system to warm up. If this warmup period is not respected, results may be inaccurate.

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Operating the DWDM Passive Component Test System

Opening an Existing Test Database

IMPORTANT

The new data will be appended to the existing database. If you only want to view the results of an already-existent database, see Opening an Existing Test Database on page 64.

To open an existing test database file with already defined settings:

1. From the Welcome/New Test window, select Open Existing Test.

2. Select the database you want to use. If the database does not appear in

the list, click More Files to find the desired database file.

3. Click Open. The database opens and you are brought to the IQS-12004B Setup window.

Note: You can double-click the test database file to proceed directly. You can also

access this function by selecting Open Database from the File menu.

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Operating the DWDM Passive Component Test System

Viewing a Recent Test

To view a recent test database file:

1. From the Welcome/New Test window, select View Recent Test.

2. Select the database that you want to consult. The default folder is

IQS\MAESTRO\IQS_DWDMTS\Userfile. If the desired database does not appear in the list, click More Files to find it.

3. click View. The database opens and you are brought to the IQS-12004B Database Browser window, which contains information

about previous tests (see Using the Database Browser on page 109).

Note: You can double-click the database file to proceed directly. You can also

access this function by selecting View Database from the File menu.

Hiding the Welcome/New Test Window

You can deactivate the automatic display of the Welcome/New Test window by checking the Don’t show this dialog in the future box. When this option is selected, you will be brought directly to the DWDM Passive Component Test System main window. This option can be disabled in the System Settings window (see Modifying System Settings on page 56).

DWDM Passive Component Test System 65

Operating the DWDM Passive Component Test System

Cleaning and Connecting Optical Fibers

IMPORTANT

To ensure maximum power and to avoid erroneous readings:

³ Always clean fiber ends as explained below before inserting

them into the port. EXFO is not responsible for damage or errors caused by bad fiber cleaning or handling.

³ Ensure that your patchcord has appropriate connectors. Joining

mismatched connectors will damage the ferrules.

To connect the fiber-optic cable to the port:

1. Clean the fiber ends as follows:

1a. Gently wipe the fiber end with a lint-free swab dipped in isopropyl

alcohol.

1b. Use compressed air to dry completely.

1c. Visually inspect the fiber end to ensure its cleanliness.

2. Carefully align the connector and port to prevent the fiber end from

touching the outside of the port or rubbing against other surfaces.

If your connector features a key, ensure that it is fully fitted into the port’s corresponding notch.

3. Push the connector in so that the fiber-optic cable is firmly in place, thus ensuring adequate contact.

If your connector features a screwsleeve, tighten the connector enough to firmly maintain the fiber in place. Do not overtighten, as this will damage the fiber and the port.

Note: If your fiber-optic cable is not properly aligned and/or connected, you will

notice heavy loss and reflection.

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Operating the DWDM Passive Component Test System

Connecting DUT and Modules

Once the reference measurements have been completed, you need to connect the DUT to the launch fiber and to the power meters. Normally, the application brings you to this step automatically. If necessary, you can go directly to the DUT Connection step. For information on accessing a step, see Accessing a Specific Test Step on page 34.

For information on reference measurements, see Calibrating the System on page 73 and Performing Reference Measurements on page 82.

WARNING

Never stare into the beam or view directly with optical instruments.

Connect the DUT input port to the start fiber and the DUT output ports to the power meters, as indicated on the screen.

DWDM Passive Component Test System 67

Operating the DWDM Passive Component Test System

Connecting DUT and Modules

You can click List or press F12 to see a detailed list of required connections (as shown below). This list shows you which DUT output port must be connected to which port on the power meters. Basically, channel 1 of the device is connected to channel 1 of the first power meter, channel 2 to the second channel of the first power meter, and so on.

Once all connections have been made, click OK to start the measurement. The system will sweep the source, transfer the data, and analyze the results in accordance with the parameters selected in the Setup window.

IMPORTANT

Before running any test, ensure that all the connectors and fiber-optic adapters (FOAs) to be used are clean, and that all fiber-optic light source warmup periods have been respected.

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Operating the DWDM Passive Component Test System

Starting the ORL Measurement Scan

Once the reference measurement is complete and if the ORL measurement has been selected, you will be prompted to prepare for the ORL measurement.

If the device you are testing is not terminated with low-reflection APC connectors, you will have to provide some sort of temporary low-reflection termination. One method is to mandrel wrap the output fibers (see figure below). Another option would be to use an index matching material.

Once all connections and preparations have been made, click OK in the main window to activate the software and start the ORL measurement scan.

Note: You can abort the ORL measurement scan at any time by clicking the Stop

button or pressing F2.

Once the measurement is done, you are brought directly to the next step.

DWDM Passive Component Test System 69

Operating the DWDM Passive Component Test System

Testing Another Component

When a test is complete, you have the possibility to begin a new test. Click OK. This will bring you back to the IQS-12004B Setup window. Restart the procedure with new parameters, as explained in Preparing the Test Setup on page 49.

Sharing the Power Meters and WRM with an External Application

You can use the power meters and the Wavelength Reference Meter with an external application without exiting the system application. You can also set the source to a specific wavelength and modify the polarization state of the IQS-5150 Polarization State Adjuster.

Note: This feature is only available after a power optimization is performed (i.e.,

after a reference or calibration.) Otherwise, the option will be grayed out.

To use the power meters and WRM with an external application:

1. From the main window menu, select Options > Alignment. The

system deallocates the power meters and the WRM.

2. If necessary, set a wavelength for the source. Click Apply to confirm your changes.

3. If necessary, adjust the polarization state to your needs.

4. Click Close to return to the main application. The power meters and

WRM are automatically reinitialized allowing you to proceed with the system as you would normally.

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Operating the DWDM Passive Component Test System

Monitoring Modules in Local Mode

The DWDM Passive Component Test System allows you to locally monitor the power meters and the Wavelength Reference Meter without exiting the application. You can also set the source to a specific wavelength and modify the polarization state of the IQS-5150 Polarization State Adjuster.

Note: This feature is only available after a power optimization is performed

(i.e., after a reference or calibration.) Otherwise, the option will be grayed out.

To monitor the power meters and WRM:

1. From the main window menu, select Options >Local control.

2. If necessary, set a wavelength for the source. Click Apply to confirm

your changes.

3. If necessary, adjust the polarization state to your needs.

4. To display the monitoring zone, click Show monitors. You can hide the

zone by clicking Hide monitors.

5. If necessary, use the Power unit box to adjust the displayed unit.

6. When you want to come back to the DWDM Passive Component Test

System application, click Close. You can then proceed with the system as you would normally.

DWDM Passive Component Test System 71

Operating the DWDM Passive Component Test System

Viewing System Information

It is possible to view the description and serial number of modules used in the system as well as enter comments about the system setup.

To view system information:

1. From the main window menu, select Help > System Info.

2. If desired, enter comments below the list of modules.

3. Press the Print button if you want to print the displayed information.

72 IQS-12004B

6 Calibrating the DWDM Passive

Component Test System

Calibrating the System

After selecting the setup parameters, the main window is displayed (see figure below). Normally, the application brings you to this step automatically. If necessary, you can go directly to the Calibration step. For information on accessing a step, see Accessing a Specific Test Step on page 34.

Note: The system has been calibrated at the factory and upon installation.

Recommended recalibration procedures are explained in the following pages.

To perform a system calibration, click OK as indicated on the screen.

DWDM Passive Component Test System 73

Calibrating the DWDM Passive Component Test System

Calibrating the System

The Calibration window appears (see figure below). In this window, you can independently select the calibration options you want by checking the appropriate boxes.

³ Detector Null: Check this option to perform an electrical offset nulling

of the power meters. To avoid disconnecting the rigid patchcord to perform the nulling, select Tu r n So u r ce O f f .

³ Wavelength Response: Check this option to correct variations in

sensitivity and response of the different power meters.

³ Return Loss: Check this option to perform the return loss calibration.

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Calibrating the DWDM Passive Component Test System

Calibrating the System

Nulling Electrical Offsets

The offset nulling process provides a zero-power reference measurement, thus eliminating the effects of electronic offsets and dark current due to detectors.

Temperature and humidity variations affect the performance of electronic circuits and optical detectors. For this reason, EXFO recommends performing a nulling of the electrical offsets whenever environmental conditions change.

IMPORTANT

Light must not reach the detector when nulling offsets.

The IQS-12004B DWDM Passive Component Test System uses both external optical power meters and internal optical power meters inside the IQS-9401 WRM.

Protective caps should be placed on the external power meters. The WRM can be blacked out by placing protective caps on both the input and output or by placing a protective cap only on the output if the Turn Source Off option is selected.

This operation ensures accuracy of the power readings by taking a measurement while a protective cap is put on the power meter detector.

DWDM Passive Component Test System 75

Calibrating the DWDM Passive Component Test System

Calibrating the System

A nulling of the electrical offsets should be done:

³ At the initial installation after the system has reached a stable operating

temperature (approximately 30 minutes).

³ If there is a significant change in environmental conditions.

EXFO also recommends that a nulling be performed prior to the wavelength response calibration and/or before the return loss calibration.

To perform a nulling:

1. Put protective caps on power meter detectors as well as on the input

and output of the WRM, as shown on the screen.

2. Click OK to perform the measurement.

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Calibrating the DWDM Passive Component Test System

Calibrating the System

the source will be turned off (as shown on the screen) and you won’t have to perform an electrical offset nulling of the power meters if you have selected the Turn Source Off option in the calibration window.

When the detector null measurement is complete, the Nulling window appears and provides you with a Pass or Fail indication. In the case of a Failed response, you have the possibility to restart the nulling by pressing the Restart Nulling button.

DWDM Passive Component Test System 77

Calibrating the DWDM Passive Component Test System

Calibrating the System

Wavelength Response Calibration

The wavelength response calibration is a full-range sweep with a launch jumper connected in sequence to each of the external power meters. It is a series of measurements starting with the first channel of the first power meter and ending at the last channel of the last power meter. This series of measurements allows the system software to correct any variations in sensitivity and response of the different power meters.

The calibration data is saved to a file and is associated with the module serial numbers. If a new module is added to the system, it will be automatically detected and you will be forced to perform a new calibration.

A wavelength response calibration must be done in the following cases:

³ Power meter(s) is replaced.

³ Power meters are added to the system.

³ The Source or WRM or PSA is replaced.

³ A PSA is added to the system.

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Calibrating the DWDM Passive Component Test System

Calibrating the System

To perform the wavelength response calibration:

1. Connect the output port of the Wavelength Reference Module to

channel 1 of the power meter, as indicated on the screen.

³ Click Scan.

³ Connect the WRM to all remaining channels in the system, as

indicated on the screen.

When the wavelength response measurement has been completed, a green check mark will appear in the Status column field, indicating that the measurement has been successfully completed for the current power meter.

2. Once the measurements have been completed for all power meters, click Close to exit the window and proceed to the next step.

DWDM Passive Component Test System 79

Calibrating the DWDM Passive Component Test System

Calibrating the System

Return Loss Calibration

The return loss calibration is performed in two steps (ORL Calibration and ORL Calibration Zero) using a reflection reference jumper supplied with the IQS-12004B DWDM Passive Component Test System. This reflection reference is connected to the output of the WRM and provides a known optical reflection.

During the first step, the system will scan the full tuning range. The second step of the ORL calibration is a zero reflection scan (again across the complete tuning range) of the reference jumper. Based on the two scans, the ORL calibration factors are calculated and stored into a system calibration file.

It will be necessary to repeat the return loss calibration if any of the modules (Source, WRM, or PSA) are replaced. One way of verifying the ORL measurements is to measure the ORL of the reflection reference. The result should be 14.7 dB ± the uncertainty specified in the specification table.

To perform the return loss calibration:

1. Connect the reflection reference jumper, as shown in the figure below.

2. Click OK.

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Calibrating the DWDM Passive Component Test System

Calibrating the System

3. Mandrel the reflection reference jumper, as shown in figure below.

4. Click OK.

WARNING

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

DWDM Passive Component Test System 81

Calibrating the DWDM Passive Component Test System

Performing Reference Measurements

Once the calibration is complete, you will have to perform an Insertion Loss/PDL reference as well as a Return Loss Zero reference. Normally, the application brings you to this step automatically. If necessary, you can go directly to the Reference step. For information on accessing a step, see Accessing a Specific Test Step on page 34.

Note: The IQS-12004B DWDM Passive Component Test System test system

automatically prompts you to perform a reference measurement (see procedure below) at start-up. However, to obtain good results, EXFO recommends to also perform a reference measurement when the test system is used non-stop during a long period of time or when there are important variations in environmental conditions.

IL/PDL Reference Measurement

An IL/PDL reference is performed to compensate for any loss or spectral non-uniformity of the launch fiber connection to the WRM output port.

During this step, a complete sweep on the first channel is performed.

Note: An IL/PDL reference measurement is required each time the system is

turned on, and is recommended whenever there is a significant change in environmental conditions.

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Calibrating the DWDM Passive Component Test System

Performing Reference Measurements

To perform the IL/PDL reference measurement:

1. Clean the connectors and connect the modules as indicated on

the screen. For more information, see Maintenance on page 213 and Connecting Optical Fibers on page 66.

2. Select Insertion Loss/PDL in the Reference window and press OK.

3. Connect the output of the Wavelength Reference Module to channel 1

of the first power meter (the location of the first parameter is shown on the screen) using the desired launch cable, as indicated on the screen.

4. Click Scan to start the operation.

5. When the IL/PDL reference measurement has been completed, a

green check mark will appear in the Status column field, indicating that the reference has been successfully completed.

6. Click Close to proceed to the next step.

IMPORTANT

Before running any reference check, ensure that all the connectors and fiber-optic adapters (FOAs) to be used are clean, and that the warmup periods have been respected.

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Calibrating the DWDM Passive Component Test System

Performing Reference Measurements

Return Loss Zero Reference Measurement

The Return Loss Zero measurement provides a zero reflection reference to the WRM return loss detector. This reference will be used to compensate for internal WRM parasitic reflections as well as parasitic reflections originating at the WRM output/launch fiber connector.

Note: A Return Loss Zero reference measurement is required each time the

system is turned on, and is recommended whenever there is a significant change in environmental conditions.

To perform the Return Loss Zero reference measurement:

1. Clean the connectors and connect the modules as indicated on

the screen. For more information, see Maintenance on page 213 and Connecting Optical Fibers on page 66.

2. Select Return Loss Zero in the IQS-12004B Reference window and press OK.

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Calibrating the DWDM Passive Component Test System

Performing Reference Measurements

3. Connect the launch fiber, as indicated on the screen.

4. Mandrel the launch fiber (i.e., wrap the fiber a minimum of five turns

around the mandrel tool).

WARNING

Never look directly into a live fiber and ensure that your eyes are protected at all times.

5. Click OK to start the operation.

DWDM Passive Component Test System 85

7 Interpreting the DWDM

Passive Component Test System Results

Optimizing Performance

The following section gives you important information on how to get optimum performance from your DWDM Passive Component Test System.

Spectral Errors

The IQS-12004B DWDM Passive Component Test System uses a temperature-stabilized Fabry-Perot interferometer and high-precision absolute wavelength reference component to ensure wavelength accuracy of the spectral measurements. To ensure that the system is operating to its published specifications, it is important to respect the recommended 30-minute warmup period and the specified operating environment.

The system is calibrated at EXFO and verified with the NIST SRM 2519 HCN absorption cell. EXFO recommends a yearly recalibration of the IQS-9401 Wavelength Reference Module.

DWDM Passive Component Test System 87

Interpreting the DWDM Passive Component Test System Results

Optimizing Performance

IL/PDL Errors

There are numerous possible sources of errors for the insertion loss measurement. Some of them are inherent to system and test procedures, while others are related to operation and fiber handling. Understanding these sources of error will help you to optimize the accuracy of your loss measurements.

³ Environmental stability

To ensure optimum results, it is important to respect the recommended 30-minute warmup period before performing any calibration, reference, or null measurement.

³ Source power stability

The IQS-9401 has an internal detector that is always measuring the optical power at the output of the WRM. This reference power is used along with the calibrated coupling ratio of the output coupler to correct variations in the source power. Therefore the effect of any instabilities in the source output power have been minimized.

³ Connector repeatability

It is well known that connector repeatability is a significant source of error when testing the IL of any connectorized component. There is no practical way of completely eliminating these errors. However, if all connectors are of good quality and adequately cleaned, the errors are minimized. Where it is important to measure the IL of the device alone, you should use fusion splices on the launch side of the DUT.

88 IQS-12004B

EXFO IQS-12004B User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Certification Information

Step-by-Step Approach

Test Features and Results

Modularity and Flexibility

System Overview

Testin g M a n y D e vices with the MultiPath Testing Option

Hardware Components Description

Tunable L aser Source

Module Description

Testin g Pro c e d u r e

Database Structure

Using GPIB or COM to Control the System

Conventions

2 Safety Information

Laser Safety Information

Safety Information

Inserting and Removing Test Modules

Installing Hardware Components

Installing the IQS-12004B DWDM Passive Component Test System Software

Installing the MultiPath Testing Option Software

Starting and Exiting the DWDM Passive Component Test System Application

Accessing a Specific Test Step

Starting and Exiting the MultiPath Testing Option Application

Configuring DUT Parameters for Pass/Fail Analysis

Configuring an Optical Port

Configuring a DUT

Configuring DUT Company/Customer Parameters

Customizing the Channel List

Preparing the Test Setup

Identifying the Current DUT

Modifying System Settings

Working with Access Levels

Opening a New Test Database

Opening an Existing Test Database

Viewing a Recent Test

Hiding the Welcome/New Test Window

Cleaning and Connecting Optical Fibers

Connecting DUT and Modules

Starting the ORL Measurement Scan

Testing Another Component

Sharing the Power Meters and WRM with an External Application

Monitoring Modules in Local Mode

Viewing System Information

Calibrating the System

Performing Reference Measurements

Optimizing Performance