Agilent 83437A Users Guide

Agilent 83437A Broadband Light Source User’s Guide

Agilent Part No. 83437-90010 Printed in USA February 2000

Agilent Technologies Lightwave Division 1400 Fountaingrove Parkway Santa Rosa, CA 95403-1799, USA (707) 577-1400

Notice.

The information contained in this document is subject to change without notice. Companies, names, and data used in examples herein are fictitious unless otherwise noted. Agilent Technologies makes no warranty of any kind with regard to this material, including but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Agilent Technologies shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.

Restricted Rights Legend.

Use, duplication, or disclosure by the U.S. Government is subject to restrictions as set forth in subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at DFARS 252.227-7013 for DOD agencies, and subparagraphs (c) (1) and (c) (2) of the Commercial Computer Software Restricted Rights clause at FAR 52.227-19 for other agencies.

Warranty.

This Agilent Technologies instrument product is warranted against defects in

material and workmanship for a period of one year from date of shipment. During the warranty period, Agilent Technologies will, at its option, either repair or replace products which prove to be defective. For warranty service or repair, this product must be returned to a service facility designated by Agilent Technologies. Buyer shall prepay shipping charges to Agilent Technologies and Agilent Technologies shall pay shipping charges to return the product to Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products returned to Agilent Technologies from another country.

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

Limitation of Warranty.

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer, Buyersupplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation or maintenance.

No other warranty is expressed or implied. Agilent Technologies specifically disclaims the implied warranties of merchantability and fitness for a particular purpose.

Exclusive Remedies.

The remedies provided herein are buyer's sole and exclusive remedies. Agilent Technolo-

gies shall not be liable for any direct, indirect, special, incidental, or consequential damages, whether based on contract, tort, or any other legal theory.

Safety Symbols.

CAUTION

The

caution

sign denotes a hazard. It calls attention to a procedure which, if not correctly performed or adhered to, could result in damage to or destruction of the product. Do not proceed beyond a caution sign until the indicated conditions are fully understood and met.

WAR NING

The

warning

sign denotes a hazard. It calls attention to a procedure which, if not correctly performed or adhered to, could result in injury or loss of life. Do not proceed beyond a warning sign until the indicated conditions are fully understood and met.

The instruction manual symbol. The product is marked with this warning symbol when it is necessary for the user to refer to the instructions in the manual.

The laser radiation symbol. This warning symbol is marked on products which have a laser output.

The AC symbol is used to indicate the required nature of the line module input power.

The ON symbols are

used to mark the positions of the instrument power line switch.

The OFF symbols

❍

are used to mark the positions of the instrument power line switch.

The CE mark is a registered trademark of the European Community.

The CSA mark is a registered trademark of the Canadian Standards Association.

The C-Tick mark is a registered trademark of the Australian Spectrum Management Agency.

This text denotes the

ISM1-A

instrument is an Industrial Scientific and Medical Group 1 Class A product.

Typographical Conventions.

The following conventions are used in this book:

Key type

for keys or text located on the keyboard or instrument.

Softkey type

for key names that are displayed on the instrument’s screen.

Display type

for words or characters displayed on the computer’s screen or instrument’s display.

User type

for words or charac-

ters that you type or enter.

Emphasis

type for words or characters that emphasize some point or that are used as place holders for text that you type.

The Agilent 83437A—At a Glance

The Agilent 83437A Broadband Light Source provides incoherent light for characterizing fiber-optic components. Because its single-mode output originates from edge emitting LEDs (EELEDs), the power density of the output spectrum is considerably greater than that of surface emitting LEDs or whitelight tungsten lamp sources.

Several output wavelengths are available

Although the standard Agilent 83437A’s output is 1500 nm, your instrument may include additional options which provide a maximum light spread of over 500 nm. Up to four internal EELED sources can be installed when selected from the following options:

• Option 002: 1200 nm source

• Option 003: 1310 nm source

• Option 004: 1430 nm source

• Option 005: 1500 nm source deleted

• Option 006: 1650 nm source

Even if your instrument has several wavelength options, all the light is coupled so that it emerges from one output connector.

Each EELED can be modulated or turned off

You can digitally modulate the output of each individual source using a TTL compatible signal. For a complete discussion of modulating the output light and making measurements with your Agilent 83437A, refer to Chapter 2,

“Making Measurements”.

iii

The Agilent 83437A—At a Glance

Measurement accuracy—it’s up to you!

Fiber-optic connectors are easily damaged when connected to dirty or damaged cables and accessories. The Agilent 83437A’s front-panel OPTICAL OUT connector is no exception. When you use improper cleaning and handling techniques, you risk expensive instrument repairs, damaged cables, and compromised measurements.

Before you connect any fiber-optic cable to the Agilent 83437A, refer to “Cleaning Con-

nections for Accurate Measurements” on page 2-11.

Laser classification

The Agilent 83437A is classified as an IEC LED Class 1 product. The total power of light energy radiated out of the OPTICAL OUT connector is less than –5 dBm. Operator maintenance or precautions are not necessary to maintain safety. No controls, adjustments, or performance of procedures result in hazardous radiation exposure.

The Agilent 83437A—At a Glance

Rear view of instrument

General Safety Considerations

This product has been designed and tested in accordance with IEC Publication 61010-1, Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use, and has been supplied in a safe condition. The instruction documentation contains information and warnings that must be followed by the user to ensure safe operation and to maintain the product in a safe condition.

WARNING

If this instrument is not used as specified, the protection provided by the equipment could be impaired. This instrument must be used in a normal condition (in which all means for protection are intact) only.

To prevent electrical shock, disconnect the Agilent 83437A from mains before cleaning. Use a dry cloth or one slightly dampened with water to clean the external case parts. Do not attempt to clean internally.

This is a Safety Class 1 product (provided with a protective earthing ground incorporated in the power cord). The mains plug shall only be inserted in a socket outlet provided with a protective earth contact. Any interruption of the protective conductor inside or outside of the product is likely to make the product dangerous. Intentional interruption is prohibited.

No operator serviceable parts inside. Refer servicing to qualified personnel. To prevent electrical shock, do not remove covers.

For continued protection against fire hazard, replace line fuse only with same type and ratings, (type T 0.315A/250V for 100/120V operation and 0.16A/250V for 220/240V operation). The use of other fuses or materials is prohibited. Verify that the value of the linevoltage fuse is correct.

• For 100/120V operation, use an IEC 127 5×20 mm, 0.315 A, 250 V, Agilent part number 2110-0449.

• For 220/240V operation, use an IEC 127 5×20 mm, 0.16 A, 250 V, Agilent Technologies part number 2110-0448.

General Safety Considerations

CAUTION

Before switching on this instrument, make sure that the line voltage selector switch is set to the line voltage of the power supply and the correct fuse is installed. Assure the supply voltage is in the specified range.

This product is designed for use in Installation Category II and Pollution Degree 2 per IEC 1010 and 664 respectively.

VENTILATION REQUIREMENTS: When installing the product in a cabinet, the convection into and out of the product must not be restricted. The ambient temperature (outside the cabinet) must be less than the maximum operating temperature of the product by 4°C for every 100 watts dissipated in the cabinet. If the total power dissipated in the cabinet is greater than 800 watts, then forced convection must be used.

Always use the three-prong ac power cord supplied with this instrument. Failure to ensure adequate earth grounding by not using this cord may cause instrument damage.

Do not

connect ac power until you have verified the line voltage is correct as described in “Line Power Requirements” on page 1-7. Damage to the equipment could result.

This instrument has autoranging line voltage input. Be sure the supply voltage is within the specified range.

vii

The Agilent 83437A—At a Glance iii

1 Getting Started

Step 1. Inspect the Shipment 1-4 Step 2. Check the Fuse 1-6 Step 3. Connect the Line-Power Cable 1-7 Step 4. Turn on the Agilent 83437A 1-9 Returning the Instrument for Service 1-10

2 Making Measurements

Modulating the Output Light 2-3 Performing Stimulus-Response Measurements 2-4 Ambient Light Suppression 2-8 Cleaning Connections for Accurate Measurements 2-11

3 Specifications and Regulatory Information

Specifications 3-3 Regulatory Information 3-8

4 Reference

Instrument Options 4-2 Accessories 4-2 Front-Panel Fiber-Optic Adapters 4-3 Power Cords 4-4 Agilent Technologies Service Offices 4-5

5Servicing

General Information 5-4 Electrostatic Discharge Information 5-10 Troubleshooting 5-12 Performance Tests 5-18 Adjustment Procedures 5-22 Replacing Instrument Assemblies 5-27 Replaceable Parts 5-34 Replaceable Parts 5-47

Contents-1

Step 1. Inspect the Shipment 1-4 Step 2. Check the Fuse 1-6 Step 3. Connect the Line-Power Cable 1-7 Step 4. Turn on the Agilent 83437A 1-9 Returning the Instrument for Service 1-10

Getting Started

The instructions in this chapter show you how to install your Agilent 83437A. You should be able to finish these procedures in about ten to twenty minutes. After you’ve completed this chapter, continue with Chapter 2, “Making Mea-

surements”.

Refer to Chapter 3, “Specifications and Regulatory Information” for information on operating conditions such as temperature.

If you should ever need to clean the cabinet, use a damp cloth only.

WARNING

CAUTION

This is a Safety Class I product (provided with a protective earthing ground incorporated in the power cord). The mains plug shall only be inserted in a socket outlet provided with a protective earth contact. Any interruption of the protective conductor inside or outside of the product is likely to make the product dangerous. Intentional interruption is prohibited.

This product has autoranging line voltage input. Be sure the supply voltage is within the specified range.

This product is designed for use in INSTALLATION CATEGORY II and POLLUTION DEGREE 2, per IEC 1010 and 664 respectively.

1-2

Getting Started

Measurement accuracy—it’s up to you!

Fiber-optic connectors are easily damaged when connected to dirty or damaged cables and accessories. The Agilent 83437A’s front-panel OPTICAL OUT connector is no excep- tion. When you use improper cleaning and handling techniques, you risk expensive instrument repairs, damaged cables, and compromised measurements.

Before you connect any fiber-optic cable to the Agilent 83437A, “Cleaning Connections

for Accurate Measurements” on page 2-11.

1-3

Getting Started

Step 1. Inspect the Shipment

Verify that all components ordered have arrived by comparing the shipping forms to the original purchase order. Inspect all shipping containers.

If your shipment is damaged or incomplete, save the packing materials and notify both the shipping carrier and the nearest Agilent Technologies service office. Agilent Technologies will arrange for repair or replacement of damaged or incomplete shipments without waiting for a settlement from the transportation company. Notify the Agilent Technologies customer engineer of any problems.

Make sure that the serial number and options listed on the instrument’s rearpanel label match the serial number and options listed on the shipping document. The following figure is an example of the rear-panel serial number label:

1-4

Step 1. Inspect the Shipment

Table 1-1. Agilent 83437A Options

Option Description

001 1550 nm isolator (offered only with standard instrument or Option 022)

002 1200 nm EELED source installed

003 1310 nm EELED source installed

004 1430 nm EELED source installed

005 Delete 1550 nm EELED source

006 1650 nm EELED source installed

011 Diamond HMS-10 fiber-optic input connector interface

013 DIN 47256 fiber-optic input connector interface

014 ST fiber-optic input connector interface

017 SC fiber-optic input connector interface

Getting Started

022 Angled contact fiber-optic output interface. Angled contact connects only with

FC/PC and Diamond HMS-10.

1-5

Getting Started

Step 2. Check the Fuse

Locate the line-input connector on the instrument’s rear panel.

Disconnect the line-power cable if it is connected.

Use a small flat-blade screwdriver to open the pull-out fuse drawer.

WARNING

Verify that the value of the line-voltage fuse in the pull-out drawer is correct. The recommended fuse is an IEC 127 5×20 mm, 6.3A, 250 V, Agilent part number 2110-0703.

Notice that an extra fuse is provided in a drawer located on the fuse holder.

For continued protection against fire hazard, replace line fuse only with same type and ratings, (type T 6.3A/250V for 100/240V operation). The use of other fuses or materials is prohibited.

1-6

Step 3. Connect the Line-Power Cable

Getting Started

CAUTION

Always use the three-prong AC power cord supplied with this instrument. Failure to ensure adequate earth grounding by not using this cord may cause instrument damage.

Do not

connect ac power until you have verified the line voltage is correct as described in the following paragraphs. Damage to the equipment could result.

This instrument has autoranging line voltage input. Be sure the supply voltage is within the specified range.

Verify that the line power meets the requirements shown in the following table.

Line Power Requirements

Power: 115 VAC: 50 WATTS MAX.

230 VAC: 50 WATTS MAX.

Voltage nominal: 115 VAC / 230 VAC

range 115 VAC: 90-132 V range 230 VAC: 198-254 V

Frequency nominals: 50 Hz / 60 Hz

range: 47-63 Hz

Connect the line-power cord to the instrument’s rear-panel connector.

1-7

Getting Started

Step 3. Connect the Line-Power Cable

Connect the other end of the line-power cord to the power receptacle.

Various power cables are available to connect the Agilent 83437A to ac power outlets unique to specific geographic areas. The cable appropriate for the area to which the Agilent 83437A is originally shipped is included with the unit. You can order additional ac power cables for use in different geographic areas.

Refer to “Power Cords” on page 4-4.

1-8

Step 4. Turn on the Agilent 83437A

Getting Started

Press the front-panel

The front-panel ply after the EMC filters and before other parts of the instrument.

Use the front-panel

If the Agilent 83437A fails to turn on properly, consider the following possibilities:

• Is the line fuse good?

• Does the line socket have power?

• Is it plugged into the proper ac power source?

If the instrument still fails, return it to Agilent Technologies for repair. Refer to

“Returning the Instrument for Service” on page 1-10.

LINE

key.

LINE

switch disconnects the mains circuits from the mains sup-

ACTIVE

key to turn the light output on and off.

1-9

Getting Started

Returning the Instrument for Service

The instructions in this section show you how to properly return the instrument for repair or calibration. Always call the Agilent Technologies Instrument Support Center first to initiate service service office. This ensures that the repair (or calibration) can be properly tracked and that your instrument will be returned to you as quickly as possible. Call this number regardless of where you are located. Refer to “Agilent

Technologies Service Offices” on page 4-5 for a list of service offices.

Agilent Technologies Instrument Support Center . . . . . . . . . . . (800) 403-0801

If the instrument is still under warranty or is covered by an Agilent Technologies maintenance contract, it will be repaired under the terms of the warranty or contract (the warranty is at the front of this manual). If the instrument is no longer under warranty or is not covered by an Agilent Technologies maintenance plan, Agilent Technologies will notify you of the cost of the repair after examining the unit.

When an instrument is returned to a Agilent Technologies service office for servicing, it must be adequately packaged and have a complete description of the failure symptoms attached. When describing the failure, please be as specific as possible about the nature of the problem. Include copies of additional failure information (such as the instrument failure settings, data related to instrument failure, and error messages) along with the instrument being returned.

before

returning your instrument to a

Preparing the instrument for shipping

Write a complete description of the failure and attach it to the instrument. Include any specific performance details related to the problem. The following

1-10

Getting Started

Returning the Instrument for Service

information should be returned with the instrument.

• Type of service required.

• Date instrument was returned for repair.

• Description of the problem:

• Whether problem is constant or intermittent.

• Whether instrument is temperature-sensitive.

• Whether instrument is vibration-sensitive.

• Instrument settings required to reproduce the problem.

• Performance data.

• Company name and return address.

• Name and phone number of technical contact person.

• Model number of returned instrument.

• Full serial number of returned instrument.

• List of any accessories returned with instrument.

Cover all front or rear-panel connectors that were originally covered when you first received the instrument.

CAUTION

Cover electrical connectors to protect sensitive components from electrostatic damage. Cover optical connectors to protect them from damage due to physical contact or dust.

Instrument damage can result from using packaging materials other than the original materials. Never use styrene pellets as packaging material. They do not adequately cushion the instrument or prevent it from shifting in the carton. They may also cause instrument damage by generating static electricity.

Pack the instrument in the original shipping containers. Original materials are available through any Agilent Technologies office. Or, use the following guidelines:

• Wrap the instrument in antistatic plastic to reduce the possibility of damage

caused by electrostatic discharge.

• For instruments weighing less than 54 kg (120 lb), use a double-walled, cor-

rugated cardboard carton of 159 kg (350 lb) test strength.

• The carton must be large enough to allow approximately 7 cm (3 inches) on

all sides of the instrument for packing material, and strong enough to accommodate the weight of the instrument.

• Surround the equipment with approximately 7 cm (3 inches) of packing ma-

terial, to protect the instrument and prevent it from moving in the carton. If packing foam is not available, the best alternative is S.D-240 Air Cap™ from

1-11

Getting Started

Returning the Instrument for Service

Sealed Air Corporation (Commerce, California 90001). Air Cap looks like a plastic sheet filled with air bubbles. Use the pink (antistatic) Air Cap™ to reduce static electricity. Wrapping the instrument several times in this material will protect the instrument and prevent it from moving in the carton.

Seal the carton with strong nylon adhesive tape.

Mark the carton “FRAGILE, HANDLE WITH CARE”.

Retain copies of all shipping papers.

1-12

Modulating the Output Light 2-3 Performing Stimulus-Response Measurements 2-4

To characterize a passive device 2-6

Ambient Light Suppression 2-8

To suppress ambient light 2-9

Cleaning Connections for Accurate Measurements 2-11

Making Measurements

In this chapter, you’ll find examples of making measurements using the Agilent 83437A. These examples use your Agilent 83437A in conjunction with an Agilent 71450/1/2B optical spectrum analyzer. Because of the Agilent 83437A’s relatively high power density, the optical spectrum analyzer can sweep much faster than if a white light source or surface emitting LED were used.

The last section of this chapter explains how to maintain top performance of your instrument by using proper handling and cleaning techniques. Be sure to read this section before using your Agilent 83437A.

2-2

Modulating the Output Light

Making Measurements

Modulating the Output Light

The rear panel of the instrument is equipped with a tor for each installed source. You can use these connectors to digitally modulate the source or completely disable its output light.

Digital modulation requires a TTL compatible signal. Modulation rates can range from DC to 100 kHz. A “high” TTL value turns the source on. A “low” TTL value turns the source off. The following schematic shows the input circuitry for each

If you want to turn a source off, simply connect a BNC short to the rear-panel modulation input. You can order a BNC short from Agilent Technologies using the following part number: 1250-0774.

MODULATION INPUT

connector.

MODULATION INPUT

connec-

2-3

Making Measurements

Performing Stimulus-Response Measurements

This section shows you how to perform stimulus-response measurements. The more wavelength options your Agilent 83437A has installed, the wider the wavelength range that can be measured. The combination of using the Agilent 83437A for broadband stimulus and the optical spectrum analyzer for selective response provides the following benefits:

• All wavelengths are available simultaneously

• Fast measurement speeds

• Small coherence length

• High dynamic range and high resolution

Measurements for DWDM systems

The following figure shows a system which is well suited for characterizing dense wavelength-division multiplexed (DWDM) components. These include devices such as phased arrays and add and drop demultiplexers.

The polarization controller is used to characterize polarization dependencies of a device. For example, the center wavelength shift or the polarization dependent loss of a demultiplexer. Because the Agilent 83437A emits unpolarized light, if you need polarized light, add a polarizer.

Increasing wavelength accuracy

When measuring deep-notch filters, increased absolute wavelength accuracy may be required. To increase wavelength accuracy, the combination of an Agilent 8168E/F tunable laser source and the Agilent 86120A multi-wavelength meter can be used to calibrate the optical spectrum analyzer. Simply enter the difference between the two wavelength readings (optical spectrum analyzer and multi-wavelength meter) into the optical spectrum analyzer as a correction factor. Refer to the user’s guide for the optical spectrum analyzer to learn how to enter correction factors. If you use this technique, be aware that the Agilent 8168E/F measures wavelength in a vacuum and the optical spectrum analyzer measures wavelength in air unless you change its settings.

2-4

Making Measurements

Performing Stimulus-Response Measurements

Characterizing an optical amplifier

In addition to the measurement described in this section, the Agilent 83437A is an ideal broadband light source for measuring the noise-gain profile of optical amplifiers. This allows you to accurately predict the amplifier’s perfor- mance in a 4, 8, or 16 channel DWDM systems. The Agilent 71452B optical spectrum analyzers is ideal for performing these measurements. For more information, refer to Agilent Technologies product notes 71452-1, -2, and -3 which are available from your local Agilent Technologies service office.

2-5

Making Measurements

Performing Stimulus-Response Measurements

To characterize a passive device

Turn on the optical spectrum analyzer and the Agilent 83437A, and allow them to warm up for 1 hour.

Use a fiber optic cable to connect the Agilent 83437A’s output to the input of the optical spectrum analyzer.

On the optical spectrum analyzer, press

AUTO ALIGN

On the optical spectrum analyzer, use the wavelength range.

Press

Press beyond this value if needed.

If you are measuring a deep-notch filter, more sensitivity may be required. Perform the following steps:

Press

These steps cause the optical spectrum analyzer to compensate for the effect of stray light inside the analyzer’s monochromator.

Press

If changes to wavelength range or resolution bandwidth are made after this trace is stored, repeat this step.

2-6

REF LEVEL

SENS,

State

STORE THRU->B,

, and set the reference level to –30 dBm.

and set the sensitivity to –70 dBm. You can increase the sensitivity

Amptd

BW,Swp

instr modes

, and then

SWPTIME AutoMan

, and then

and then

CHOP On

STM/RESP

NORM On Off

INSTR PRESET, AUTO MEAS,

START

so that On is underlined.

, and set the sweep time to 50 seconds.

to normalize the response.

and

STOP

keys to set the proper

and then

Making Measurements

Performing Stimulus-Response Measurements

Insert the device you are testing between the optical spectrum analyzer and the Agilent 83437A.

NORMAL ON/OFF

Press

to turn the marker on. Rotate the front-panel knob to

read the values along the response.

2-7

Making Measurements

Ambient Light Suppression

Ambient light can add significant errors to optical power measurements. This is especially true when you are using or characterizing open beam devices. The following example shows how the combination of the Agilent 83437A and an Agilent 71450/1/2B optical spectrum analyzer can be used to eliminate this error. The picture below shows the optical spectrum analyzer’s display. The top trace shows the amplitude contribution from ambient light. The bottom trace was captured after performing the procedure in this section.

In order to perform this measurement, the Agilent 83437A’s output is modulated at 270 Hz. Because, the optical spectrum analyzer has the ability to synchronize its data acquisition with the modulated light it can subtract out the effects of ambient light. To learn more about using the optical spectrum analyzer’s adc trigger feature, refer to Agilent Technologies Product Note 71452–4, “Pulsed or Time-Dependent Optical Spectra Measurements.”

2-8

Making Measurements

Ambient Light Suppression

To suppress ambient light

This example uses specific equipment and settings to demonstrate how to make accurate measurements in the presence of ambient light. As shown in the equipment setup drawing, two Agilent 83437As are used. One Agilent 83437A represents the broadband contribution of ambient light. Because a 12 dB coupler is used, the ambient light contributes approximately 10 dB more power to the optical spectrum analyzer than the desired source.

Connect the equipment as shown in the following figure.

Set the square-wave generator’s TTL output for a frequency of 270 Hz. Set its power level to 10 µW.

If you use a different modulation frequency, set the optical spectrum analyzer’s resolution bandwidth to a value that is at least six times greater than the modulation frequency.

On the optical spectrum analyzer, press

Use the 1600 nm.

START

and

STOP

keys to set the wavelength range from 1500 nm to

INSTR PRESET

2-9

Making Measurements

Ambient Light Suppression

REF LEVEL

Press

Amptd

Press

MORE, CHOP On Off

Press

BW,Swp

Press

MORE, MORE, adc trigger

Press

ADCTRIG DELAY

Press

, and set the reference level to –30 dBm.

LOG dB/DIV

, and enter 5 dB.

so that Off is underlined.

SWPTIME AutoMan

, and set the sweep time to 10 seconds.

, and then

ADCTRIG AC

, and enter a value of 1 ms.

The display should now show the proper amplitude values with the effect of the ambient light subtracted out.

2-10

Making Measurements

Cleaning Connections for Accurate Measurements

Today, advances in measurement capabilities make connectors and connection techniques more important than ever. Damage to the connectors on calibration and verification devices, test ports, cables, and other devices can degrade measurement accuracy and damage instruments. Replacing a damaged connector can cost thousands of dollars, not to mention lost time! This expense can be avoided by observing the simple precautions presented in this book. This book also contains a brief list of tips for caring for electrical connectors.

Choosing the Right Connector

A critical but often overlooked factor in making a good lightwave measurement is the selection of the fiber-optic connector. The differences in connector types are mainly in the mechanical assembly that holds the ferrule in position against another identical ferrule. Connectors also vary in the polish, curve, and concentricity of the core within the cladding. Mating one style of cable to another requires an adapter. Agilent Technologies offers adapters for most instruments to allow testing with many different cables. Figure 2-1 on

page 2-12 shows the basic components of a typical connectors.

The system tolerance for reflection and insertion loss must be known when selecting a connector from the wide variety of currently available connectors. Some items to consider when selecting a connector are:

• How much insertion loss can be allowed?

• Will the connector need to make multiple connections? Some connectors are

better than others, and some are very poor for making repeated connections.

• What is the reflection tolerance? Can the system take reflection degradation?

• Is an instrument-grade connector with a precision core alignment required?

• Is repeatability tolerance for reflection and loss important? Do your specifica-

2-11

Making Measurements

Cleaning Connections for Accurate Measurements

tions take repeatability uncertainty into account?

• Will a connector degrade the return loss too much, or will a fusion splice be required? For example, many DFB lasers cannot operate with reflections from connectors. Often as much as 90 dB isolation is needed.

Figure 2-1. Basic components of a connector.

Over the last few years, the FC/PC style connector has emerged as the most popular connector for fiber-optic applications. While not the highest performing connector, it represents a good compromise between performance, reliability, and cost. If properly maintained and cleaned, this connector can withstand many repeated connections.

However, many instrument specifications require tighter tolerances than most connectors, including the FC/PC style, can deliver. These instruments cannot tolerate connectors with the large non-concentricities of the fiber common with ceramic style ferrules. When tighter alignment is required, Agilent Technologies instruments typically use a connector such as the Diamond HMS-10, which has concentric tolerances within a few tenths of a micron. Agilent Technologies then uses a special universal adapter, which allows other cable types to mate with this precision connector. See Figure 2-2.

2-12

Making Measurements

Cleaning Connections for Accurate Measurements

Figure 2-2. Universal adapters to Diamond HMS-10.

The HMS-10 encases the fiber within a soft nickel silver (Cu/Ni/Zn) center which is surrounded by a tough tungsten carbide casing, as shown in

Figure 2-3.

Figure 2-3. Cross-section of the Diamond HMS-10 connector.

The nickel silver allows an active centering process that permits the glass fiber to be moved to the desired position. This process first stakes the soft nickel silver to fix the fiber in a near-center location, then uses a post-active staking to shift the fiber into the desired position within 0.2µm. This process, plus the keyed axis, allows very precise core-to-core alignments. This connector is found on most Agilent Technologies lightwave instruments.

2-13

Making Measurements

Cleaning Connections for Accurate Measurements

The soft core, while allowing precise centering, is also the chief liability of the connector. The soft material is easily damaged. Care must be taken to minimize excessive scratching and wear. While minor wear is not a problem if the glass face is not affected, scratches or grit can cause the glass fiber to move out of alignment. Also, if unkeyed connectors are used, the nickel silver can be pushed onto the glass surface. Scratches, fiber movement, or glass contamination will cause loss of signal and increased reflections, resulting in poor return loss.

Inspecting Connectors

Because fiber-optic connectors are susceptible to damage that is not immediately obvious to the naked eye, poor measurements result without the user being aware. Microscopic examination and return loss measurements are the best way to ensure good measurements. Good cleaning practices can help ensure that optimum connector performance is maintained. With glass-toglass interfaces, any degradation of a ferrule or the end of the fiber, any stray particles, or finger oil can have a significant effect on connector performance. Where many repeat connections are required, use of a connector saver or patch cable is recommended.

Figure 2-4 shows the end of a clean fiber-optic cable. The dark circle in the

center of the micrograph is the fiber’s 125 µm core and cladding which carries the light. The surrounding area is the soft nickel-silver ferrule. Figure 2-5 shows a dirty fiber end from neglect or perhaps improper cleaning. Material is smeared and ground into the end of the fiber causing light scattering and poor reflection. Not only is the precision polish lost, but this action can grind off the glass face and destroy the connector.

Figure 2-6 shows physical damage to the glass fiber end caused by either

repeated connections made without removing loose particles or using improper cleaning tools. When severe, the damage of one connector end can be transferred to another good connector endface that comes in contact with the damaged one. Periodic checks of fiber ends, and replacing connecting cables after many connections is a wise practice.

The cure for these problems is disciplined connector care as described in the following list and in “Cleaning Connectors” on page 2-18.

2-14

Making Measurements

Cleaning Connections for Accurate Measurements

Use the following guidelines to achieve the best possible performance when making measurements on a fiber-optic system:

• Never use metal or sharp objects to clean a connector and never scrape the connector.

• Avoid matching gel and oils.

Figure 2-4. Clean, problem-free fiber end and ferrule.

Figure 2-5. Dirty fiber end and ferrule from poor cleaning.

2-15

Making Measurements

Cleaning Connections for Accurate Measurements

Figure 2-6. Damage from improper cleaning.

While these often work well on first insertion, they are great dirt magnets. The oil or gel grabs and holds grit that is then ground into the end of the fiber. Also, some early gels were designed for use with the FC, non-contacting connectors, using small glass spheres. When used with contacting connectors, these glass balls can scratch and pit the fiber. If an index matching gel or oil must be used, apply it to a freshly cleaned connector, make the measurement, and then immediately clean it off. Never use a gel for longer-term connections and never use it to improve a damaged connector. The gel can mask the extent of damage and continued use of a damaged fiber can transfer damage to the instrument.

• When inserting a fiber-optic cable into a connector, gently insert it in as straight a line as possible. Tipping and inserting at an angle can scrape material off the inside of the connector or even break the inside sleeve of connectors made with ceramic material.

• When inserting a fiber-optic connector into a connector, make sure that the fiber end does not touch the outside of the mating connector or adapter.

• Avoid over tightening connections.

Unlike common electrical connections, tighter is

not

better. The purpose of the connector is to bring two fiber ends together. Once they touch, tightening only causes a greater force to be applied to the delicate fibers. With connectors that have a convex fiber end, the end can be pushed off-axis resulting in misalignment and excessive return loss. Many measurements are actually improved by backing off the connector pressure. Also, if a piece of grit does happen to get by the cleaning procedure, the tighter connection is more likely to damage the glass. Tighten the connectors just until the two fibers touch.

2-16

Making Measurements

Cleaning Connections for Accurate Measurements

• Keep connectors covered when not in use.

• Use fusion splices on the more permanent critical nodes. Choose the best con-

nector possible. Replace connecting cables regularly. Frequently measure the return loss of the connector to check for degradation, and clean every connector, every time.

All connectors should be treated like the high-quality lens of a good camera. The weak link in instrument and system reliability is often the inappropriate use and care of the connector. Because current connectors are so easy to use, there tends to be reduced vigilance in connector care and cleaning. It takes only one missed cleaning for a piece of grit to permanently damage the glass and ruin the connector.

Measuring insertion loss and return loss

Consistent measurements with your lightwave equipment are a good indication that you have good connections. Since return loss and insertion loss are key factors in determining optical connector performance they can be used to determine connector degradation. A smooth, polished fiber end should produce a good return-loss measurement. The quality of the polish establishes the difference between the “PC” (physical contact) and the “Super PC” connectors. Most connectors today are physical contact which make glass-to-glass connections, therefore it is critical that the area around the glass core be clean and free of scratches. Although the major area of a connector, excluding the glass, may show scratches and wear, if the glass has maintained its polished smoothness, the connector can still provide a good low level return loss connection.

If you test your cables and accessories for insertion loss and return loss upon receipt, and retain the measured data for comparison, you will be able to tell in the future if any degradation has occurred. Typical values are less than 0.5 dB of loss, and sometimes as little as 0.1 dB of loss with high performance connectors. Return loss is a measure of reflection: the less reflection the better (the larger the return loss, the smaller the reflection). The best physically contacting connectors have return losses better than 50 dB, although 30 to 40 dB is more common.

2-17

Making Measurements

Cleaning Connections for Accurate Measurements

Visual inspection of fiber ends

Visual inspection of fiber ends can be helpful. Contamination or imperfections on the cable end face can be detected as well as cracks or chips in the fiber itself. Use a microscope (100X to 200X magnification) to inspect the entire end face for contamination, raised metal, or dents in the metal as well as any other imperfections. Inspect the fiber for cracks and chips. Visible imperfections not touching the fiber core may not affect performance (unless the imperfections keep the fibers from contacting).

WARNING

CAUTION

Always remove both ends of fiber-optic cables from any instrument, system, or device before visually inspecting the fiber ends. Disable all optical sources before disconnecting fiber-optic cables. Failure to do so may result in permanent injury to your eyes.

Cleaning Connectors

The procedures in this section provide the proper steps for cleaning fiberoptic cables and Agilent Technologies universal adapters. The initial cleaning, using the alcohol as a solvent, gently removes any grit and oil. If a caked-on layer of material is still present, (this can happen if the beryllium-copper sides of the ferrule retainer get scraped and deposited on the end of the fiber during insertion of the cable), a second cleaning should be performed. It is not uncommon for a cable or connector to require more than one cleaning.

Agilent Technologies strongly recommends that index matching compounds

not

be applied to their instruments and accessories. Some compounds, such as gels, may be difficult to remove and can contain damaging particulates. If you think the use of such compounds is necessary, refer to the compound manufacturer for information on application and cleaning procedures.

Table 2-1. Cleaning Accessories

Item Agilent Part Number

Any commercially available denatured alcohol —

Cotton swabs 8520-0023

Small foam swabs 9300-1223

Compressed dust remover (non-residue) 8500-5262

2-18

Cleaning Connections for Accurate Measurements

Table 2-2. Dust Caps Provided with Lightwave Instruments

Item Agilent Part Number

Laser shutter cap 08145-64521

FC/PC dust cap 08154-44102

Biconic dust cap 08154-44105

DIN dust cap 5040-9364

HMS10/dust cap 5040-9361

ST dust cap 5040-9366

To clean a non-lensed connector

Making Measurements

CAUTION

Do not use any type of foam swab to clean optical fiber ends. Foam swabs can leave filmy deposits on fiber ends that can degrade performance.

Apply pure isopropyl alcohol to a clean lint-free cotton swab or lens paper.

Cotton swabs can be used as long as no cotton fibers remain on the fiber end after cleaning.

Clean the ferrules and other parts of the connector while avoiding the end of the fiber.

Apply isopropyl alcohol to a new clean lint-free cotton swab or lens paper.

Clean the fiber end with the swab or lens paper.

not

scrub during this initial cleaning because grit can be caught in the

swab and become a gouging element.

Immediately dry the fiber end with a clean, dry, lint-free cotton swab or lens paper.

Blow across the connector end face from a distance of 6 to 8 inches using filtered, dry, compressed air. Aim the compressed air at a shallow angle to the fiber end face.

Nitrogen gas or compressed dust remover can also be used.

2-19

Making Measurements

Cleaning Connections for Accurate Measurements

CAUTION

Do not shake, tip, or invert compressed air canisters, because this releases particles in the can into the air. Refer to instructions provided on the compressed air canister.

As soon as the connector is dry, connect or cover it for later use.

If the performance, after the initial cleaning, seems poor try cleaning the connector again. Often a second cleaning will restore proper performance. The second cleaning should be more arduous with a scrubbing action.

To clean an adapter

The fiber-optic input and output connectors on many Agilent Technologies instruments employ a universal adapter such as those shown in the following picture. These adapters allow you to connect the instrument to different types of fiber-optic cables.

Figure 2-7. Universal adapters.

Apply isopropyl alcohol to a clean foam swab.

Cotton swabs can be used as long as no cotton fibers remain after cleaning. The foam swabs listed in this section’s introduction are small enough to fit into adapters.

Although foam swabs can leave filmy deposits, these deposits are very thin, and the risk of other contamination buildup on the inside of adapters greatly outweighs the risk of contamination by foam swabs.

Clean the adapter with the foam swab.

Dry the inside of the adapter with a clean, dry, foam swab.

Blow through the adapter using filtered, dry, compressed air.

Nitrogen gas or compressed dust remover can also be used. Do not shake, tip, or invert compressed air canisters, because this releases particles in the can into the air. Refer to instructions provided on the compressed air canister.

2-20

Specifications 3-3 Regulatory Information 3-8

Specifications and Regulatory Information

This chapter lists specification and characteristics of the instrument. The distinction between these terms is described as follows:

• Specifications describe warranted performance over the temperature range 0°C to +45°C and relative humidity <95% (unless otherwise noted). All specifications apply after the instrument’s temperature has been stabilized after 15 minutes of continuous operation.

Characteristics

•

ranted, performance parameters.

Calibration Cycle

This instrument requires periodic verification of performance. The instrument should have a complete verification of specifications at least once every two years.

provide useful information by giving functional, but nonwar-

Characteristics are printed in italics.

3-2

Specifications

Table 3-1. General Amplitude Specifications

Specifications and Regulatory Information

Specifications

1200 nm Source

Peak wavelength

Total power

a. Measured with an InGaAs power sensor. Configurations with multiple source’s have less power. Typical losses are 4 dB per coupler except

the 1310 nm/1550 nm and the 1430 nm/1650 nm coupler which have less than 1 dB loss. See figures in this section which show the spectrum for typical configurations.

1200 nm

30 nm 1310 nm ±20 nm 1430 nm ±30 nm 1550 nm ±20 nm 1650 nm ±30 nm

> –17 dBm > –13 dBm > –13 dBm > –13 dBm > –17 dBm

> 20 µW > 50 µW> 50 µW > 50 µW> 20 µW

1310 nm Source

1430 nm Source

1550 nm Source

1650 nm Source

Table 3-2. General Amplitude Characteristics

3 dB width

(characteristic)

Peak densitya

(characteristic)

1200 nm Source

45 nm 47 nm 50 nm 52 nm 55 nm

> –37 dBm/nm > –33 dBm/nm > –33 dBm/nm > –33 dBm/nm > –37 dBm/nm

> 200 nW/nm > 500 nW/nm > 500 nW/nm > 500 nW/nm > 200 nW/nm

1310 nm Source

1430 nm Source

1550 nm Source

1650 nm Source

3-3

Specifications and Regulatory Information

Specifications

Table 3-3. Total Power

Installed Options Minimum Output Power (dBm)

002 003 004

005

006

1200 nm Source

•–17.0 –21.0

•• –17.0

•–17.0 –17.0

•• –18.0 –17.0 –22.0

•• –13.0

••• –14.0 –18.0

•–14.0 –14.0

•• –18.0 –18.0 –21.0

•• –13.0

••• –17.0 –21.0

•• –18.0 –17.0 –18.0

•• • –18.0 –18.0 –18.0 –22.0

••• –17.0 –17.0

•••• –17.0 –18.0 –22.0

•–21.0 –17.0

••–25.0 –21.0 –21.0

••–17.0

•••–21.0 –21.0

•• –21.0 –21.0 –21.0

•••–25.0 –18.0 –21.0 –22.0

••• –21.0 –17.0

• ••• –21.0 –18.0 –22.0

•• –21.0 –18.0 –18.0

•• • –25.0 –18.0 –18.0 –25.0

•• • –21.0 –17.0

•• •• –25.0 –21.0 –21.0

••• –25.0 –18.0 –21.0 –18.0

•••• –21.0 –21.0 –21.0

••••• –25.0 –21.0 –18.0 –22.0

a. Option 005 deletes the 1550 nm source. b. Specification remains the same value if the Option 001 1550 nm isolator is installed.

1300 nm Source

1430 nm Source

1550 nm Source

–13.0

1650 nm Source

3-4

General Specifications

Specifications and Regulatory Information

Specifications

Compatible fiber

Power stability

a. Ambient temperature change < ±1°C measured with power meter having >30 dB return loss. One hour warm-up time required for

instrument and power meter.

m, single mode

9/125

< ±0.02 dB (15 minutes) for 1310 nm, 1430 nm, and 1550 nm sources

0.03 dB (15 minutes) for 1200 nm and 1650 nm sources

0.05 dB (6 hours)

General Characteristics

Output return loss 25 dB (characteristic)

50 dB (characteristic)

Modulation Digital (TTL compatible)

100% on-off

DC to 100 kHz (characteristic)

a. Measured at 1550 nm with isolator (Option 001) and FC/APC connector (Option 022).

Characteristic spectrum for standard 1550 nm configuration

3-5

Specifications and Regulatory Information

Specifications

Characteristic spectrum with two EELEDs installed

(Option 003)

Characteristic spectrum with three EELEDs

(Options 003 and 004)

3-6

Characteristic spectrum with four EELEDs

(Options 003, 004, and 006)

Specifications and Regulatory Information

Specifications

Operating Specifications

Use Indoor Power: 115 VAC: 50 WATTS MAX.

230 VAC: 50 WATTS MAX.

Voltage nominal: 115 VAC / 230 VAC

range 115 VAC: 90-132 V range 230 VAC: 198-254 V

Frequency nominals: 50 Hz / 60 Hz

range: 47-63 Hz Altitude Up to 15,000 feet (4,572 meters) Operating temperature

Storage temperature

Maximum relative humidity

LED Classification IEC LED Class 1 according to IEC 60825 Weight 5.5 kg (12 lb) Dimensions (H x W x D) 102 x 213 x 450 mm (4.02 x 8.39 x 17.72 in)

C to +45°C

– 40°C to +70°C

80% for temperatures up to 31

relative humidity at 40

System II chassis (half module, 3.5" height, 1.75" hole spacing)

C decreasing linearly to 50%

3-7

Specifications and Regulatory Information

Regulatory Information

Notice for Germany: Noise Declaration

• Laser Classification: This product contains an

IEC LED Class 1

• This product complies with 21 CFR 1040.10 and 1040.11.

• This product is designed for use in INSTALLATION CATEGORY II and POLLU-

TION DEGREE 2, per IEC 1010 and 664 respectively.

This is to declare that this instrument is in conformance with the German Regulation on Noise Declaration for Machines (Laermangabe nach der Maschinenlaermrerordnumg –3.GSGV Deutschland).

Acoustic Noise Emission Geraeuschemission

LpA < 70 dBOperator position Normal position per ISO 7779

LpA < 70 dB am Arbeitsplatz normaler Betrieb nach DIN 45635 t.19

3-8

Declaration of Conformity

Specifications and Regulatory Information

Regulatory Information

3-9

Instrument Options 4-2 Accessories 4-2 Front-Panel Fiber-Optic Adapters 4-3 Power Cords 4-4 Agilent Technologies Service Offices 4-5

Reference

Instrument Options

Option Description

001 1550 nm isolator (offered only with standard instrument or Option 022)

002 1200 nm EELED source installed

003 1310 nm EELED source installed

004 1430 nm EELED source installed

005 Delete 1550 nm EELED source

006 1650 nm EELED source installed

011 Diamond HMS-10 fiber-optic input connector interface

013 DIN fiber-optic input connector interface

014 ST fiber-optic input connector interface

017 SC fiber-optic input connector interface

022 Angled contact fiber-optic output interface. Angled contact connects only with

FC/PC and Diamond HMS-10.

Accessories

• BNC 50Ω short (m) for rear-panel lected source. Agilent Technologies part number 1250-0774.

• Agilent 81113PC DIN 4108 (angled) to Super-PC (straight) patchcord for use with Option 022 and Option 013 instruments.

4-2

MODULATION INPUT

connectors. Disables se-

Front-Panel Fiber-Optic Adapters

Front Panel Fiber-Optic Adapter

Description Agilent Part Number

Diamond HMS-10 81000AI

Reference

FC/PC

D4 81000GI

SC 81000KI

DIN 81000SI

ST 81000VI

Biconic 81000WI

Dust Covers

FC connector 1005-0594

Diamond HMS-10 connector 1005-0593

DIN connector 1005-0595

ST connector 1005-0596

SC connector 1005-0597

81000FI

a. The FC/PC adapter is the standard adapter supplied with the instrument.

4-3

Reference

Power Cords

Plug Type Cable Part No. Plug Description

250V 8120-1351

8120-1703

250V 8120-1369

8120-0696

250V 8120-1689

8120-1692 8120-2857p

125V 8120-1378

8120-1521 8120-1992

250V 8120-2104

8120-2296

220V 8120-2956

8120-2957

Straight *BS1363A 90°

Straight *NZSS198/ASC 90°

Straight *CEE7-Y11 90° Straight (Shielded)

Straight *NEMA5-15P 90° Straight (Medical) UL544

Straight *SEV1011 1959-24507 Type 12 90°

Straight *DHCK107 90°

Length (in/cm)

90/228 90/228

79/200

87/221

79/200 79/200 79/200

90/228 90/228 96/244

79/200 79/200

Color Country

Gray Mint Gray

Gray

Mint Gray

Mint Gray Mint Gray Coco Brown

Jade Gray Jade Gray Black

Mint Gray Mint Gray

United Kingdom, Cyprus, Nigeria, Zimbabwe, Singapore

Australia, New Zealand

East and West Europe, Saudi Arabia, So. Africa, India (unpolarized in many nations)

United States, Canada, Mexico, Philippines, Tai wa n

Switzerland

Denmark

250V 8120-4211

8120-4600

100V 8120-4753

8120-4754

* Part number shown for plug is the industry identifier for the plug only. Number shown for cable is the Agilent

Technologies part number for the complete cable including the plug.

4-4

Straight SABS164 90°

Straight MITI 90°

79/200 79/200

90/230 90/230

Jade Gray Republic of South

Africa India

Dark Gray Japan

Reference

Agilent Technologies Service Offices

Before returning an instrument for service, call the Agilent Technologies Instrument Support Center at (800) 403-0801, visit the Test and Measurement Web Sites by Country page at http://www.tm.agilent.com/tmo/country/English/ index.html, or call one of the numbers listed below.

Agilent Technologies Service Numbers

Austria 01/25125-7171

Belgium 32-2-778.37.71

Brazil (11) 7297-8600

China 86 10 6261 3819

Denmark 45 99 12 88

Finland 358-10-855-2360

France 01.69.82.66.66

Germany 0180/524-6330

India 080-34 35788

Italy +39 02 9212 2701

Ireland 01 615 8222

Japan (81)-426-56-7832

Korea 82/2-3770-0419

Mexico (5) 258-4826

Netherlands 020-547 6463

Norway 22 73 57 59

Russia +7-095-797-3930

Spain (34/91) 631 1213

Sweden 08-5064 8700

Switzerland (01) 735 7200

United Kingdom 01 344 366666

United States/Canada (800) 403-0801

4-5

General Information 5-4 Electrostatic Discharge Information 5-10 Troubleshooting 5-12

If the output power is low 5-13 To check an LED Driver Board Assembly 5-14 To check the A2A2 LED Modulation Board Assembly 5-15 To check the power supply 5-16 To check the line-power fuse 5-17

Performance Tests 5-18

Test 1. Tota l Ou tpu t Po wer 5-1 9 Test 2. Peak Wavelength Accuracy 5-20 Test 3. Power Stability 5-21

Adjustment Procedures 5-22

To adjust total power 5-22

Replacing Instrument Assemblies 5-27

To remove the instrument cover 5-28 To replace the A2 Source assembly 5-28 To route the rear-panel BNC modulation cables 5-29 To replace line filter assembly FL1 5-32 To replace a cable clip 5-33

Replaceable Parts 5-47

Servicing

In this chapter, you'll find information on troubleshooting, testing performance, adjusting, and replacing parts in the instrument.

Safety first!

Before servicing the Agilent 83437A, familiarize yourself with the safety markings on the instrument and the safety instructions in this manual. This instrument has been manufactured and tested according to international safety standards. To ensure safe operation of the instrument and the personal safety of the user and service personnel, the cautions and warnings in this manual must be heeded. Refer to the summary of safety considerations at the front of this manual.

WARNING

These servicing instructions are for use by qualified personnel only. To avoid electrical shock, do not perform any servicing unless you are qualified to do so.

The opening of covers or removal of parts is likely to expose dangerous voltages. Disconnect the instrument from all voltage sources while it is being opened.

The power cord is connected to internal capacitors that may remain live for five seconds after disconnecting the plug from its power supply.

This is a Safety Class 1 Product (provided with a protective earthing ground incorporated in the power cord). The mains plug shall only be inserted in a socket outlet provided with a protective earth contact. Any interruption of the protective conductor inside or outside of the product is likely to make the product dangerous. Intentional interruption is prohibited.

5-2

Servicing

WARNING

For continued protection against fire hazard, replace line fuse only with same type and ratings, (type T 6.3A/250V for 100/240V operation). The use of other fuses or materials is prohibited.

5-3

Servicing

General Information

Whenever you contact Agilent Technologies about your Agilent 83437A, have the complete serial number and option designation available. This will ensure you obtain accurate service information.

• Refer to Table 5-1 on page 5-5 for a list of service tools.

• Refer to Table 5-2 on page 5-5 for a list of internal labels.

• Refer to Table 5-3 on page 5-6 for the location of each instrument assembly.

• Refer to Table 5-4 on page 5-8 for the location of each cable.

Clean the cabinet using a damp cloth only.

Protect against ESD damage

Electrostatic discharge (ESD) can damage or destroy electronic components. All work on electronic assemblies should be performed at a static-safe work station. Refer to “Electrostatic Discharge Information” on page 5-10 for more information on preventing ESD.

A2 EELED Source Assembly

The A2 EELED Source Assembly can not be repaired. It must be returned to Agilent Technologies for service as a complete unit. The following assemblies are included in the A2 EELED Source Assembly. Refer to “Major Assemblies”

on page 5-6.

A2A1 Fiber Track Assembly A2A2 LED Modulation Board Assembly A2A3 through A2A6 EELED (loading depends on instrument option) A2MP1 LED heat sink A2MP2 optical deck sheet metal

5-4

Servicing

General Information

CAUTION

Do not remove any of the screws or open the cover on the A2A1 Fiber Track Assembly. Disturbing the routing of the internal fiber-optic cable could degrade instrument performance. There are no serviceable components inside this assembly. Return the complete A2 EELED Source Assembly to Agilent Technologies for service.

Table 5-1. Service Tools

Tool Agilent Part Number

Small Pozidriv screwdriver 8710-0899

Wire cutter 8710-0012

Long-nose pliers 8710-1107

5.5 mm nut driver 8710-1220

7 mm nut driver 8710-1217

TORX T-10 driver 8710-1623

TORX T-15 driver 8710-1622

Table 5-2. Internal Labels

This label identifies the A2A1 Fiber Track Assembly. The serial and option numbers listed on the label are for the instrument that the A2A1 assembly is installed in.

5-5

Servicing

General Information

Table 5-3. Major Assemblies

Reference Designator

A1 Keyboard Assembly

A2 Source Assembly (Not orderable, return A2 to Agilent Technologies)

A2A1 Fiber Track Assembly (Not orderable, return A2 to Agilent Technologies)

A2A2 LED Modulation Board Assembly (Not orderable, return A2 to Agilent

A2A3 EELED (Not orderable, return A2 to Agilent Technologies)

A2A4 EELED (Not orderable, return A2 to Agilent Technologies)

A2A5 EELED (Not orderable, return A2 to Agilent Technologies)

A2A6 EELED (Not orderable, return A2 to Agilent Technologies)

A3 Power Distribution Board Assembly

A4 Power Supply Board Assembly

A5 LED Driver Board Assembly #1

A6 LED Driver Board Assembly #2

A7 LED Driver Board Assembly #3

Description

Technologies)

A8 LED Driver Board Assembly #4

B1 Fan Assembly

FL1 Line-Module Filter. Also part of W2

5-6

Servicing

General Information

5-7

Servicing

General Information

Table 5-4. Cable Assemblies

Reference Designator

W1 Input fiber optic cable (Part of A2 assembly)

W2 Line switch cable (includes FL1 and LINE switch), to A4J1

W3 A3J7 to B1 (Part of B1)

W4 Power supply cable, A2A2J2 pin 5 to front-panel “LINE” LED indicator (green

W5 Power supply cable, A2A2J1 to front-panel “ACTIVE” LED and A1 assembly

W6 Power distribution cable, A4J2 to A3J6

W7 Modulation cable, A3J5 to A2A2J2

W8 Driver #1 cable, A3J1 to A5J2

W9 Driver #2 cable (Option 002, 003, 004, and 006), 18.5 inches long, A3J2 to A6J2

W10 Driver #3 cable (Option 002, 003, 004, and 006), 18.5 inches long, A3J3 to A7J2

W11 Driver #4 cable (Option 002, 003, 004, and 006), 18.5 inches long, A3J4 to A8J2

W12 Ribbon cable #1, A2A2J91 to A5J1

W13 Ribbon cable #2, (Option 002, 003, 004, and 006), A2A2J92 to A6J1

Description

wire)

W14 Ribbon cable #3, (Option 002, 003, 004, and 006), A2A2J93 to A7J1

W15 Ribbon cable #4, (Option 002, 003, 004, and 006), A2A2J94 to A8J1

W16 SMB to BNC cable, rear-panel J1 to A2A2J21

W17 SMB to BNC cable, rear-panel J2 to A2A2J11

W18 SMB to BNC cable, rear-panel J3 to A2A2J31

W19 SMB to BNC cable, rear-panel J4 to A2A2J41

5-8

Servicing

General Information

5-9

Servicing

Electrostatic Discharge Information

Electrostatic discharge (ESD) can damage or destroy electronic components. All work on electronic assemblies should be performed at a static-safe work station. The following figure shows an example of a static-safe work station using two types of ESD protection:

• Conductive table-mat and wrist-strap combination.

• Conductive floor-mat and heel-strap combination.

Both types, when used together, provide a significant level of ESD protection. Of the two, only the table-mat and wrist-strap combination provides adequate ESD protection when used alone.

5-10

Servicing

Electrostatic Discharge Information

To ensure user safety, the static-safe accessories must provide at least 1 MΩ of isolation from ground. Refer to Table 5-5 on page 5-11 for information on ordering static-safe accessories.

WARNING

These techniques for a static-safe work station should not be used when working on circuitry with a voltage potential greater than 500 volts.

Table 5-5. Static-Safe Accessories

Agilent Part Number

9300-0797

9300-0980 Wrist-strap cord 1.5 m (5 ft)

9300-1383 Wrist-strap, color black, stainless steel, without cord, has four adjustable

9300-1169 ESD heel-strap (reusable 6 to 12 months).

Description

3M static control mat 0.6 m wire. (The wrist-strap and wrist-strap cord are not included. They must be ordered separately.)

links and a 7 mm post-type connection.

1.2 m (2 ft× 4 ft) and 4.6 cm (15 ft) ground

5-11

Servicing

Troubleshooting

WARNING

The opening of covers or removal of parts is likely to expose dangerous voltages. Disconnect the instrument from all voltage sources while it is being opened.

The power cord is connected to internal capacitors that may remain live for five seconds after disconnecting the plug from its power supply.

The following procedures are located in this section:

If the output power is low 5-13 To check an LED Driver Board Assembly 5-14 To check the A2A2 LED Modulation Board Assembly 5-15 To check the power supply 5-16 To check the line-power fuse 5-17

5-12

If the output power is low

Check for the following common problems:

Servicing

Troubleshooting

❒

Check that the front-panel light, refer to “To check the power supply” on page 5-16.

❒

Clean the

Accurate Measurements” on page 2-11.

❒

Remove any modulating signal from the rear-panel nectors. Modulation reduces the average output power. Of course, the decrease in power is tied to the duty cycle of the modulating signal.

❒

Check the rear-panel nected to one of these jacks, the output for the associated EELED is turned off.

Perform the adjustment procedure “To adjust total power” on page 5-22.

For instrument’s with multiple EELEDs, use the procedure to locate the EELEDs with low power. Confirm that the power is low and cannot be adjusted within the specification. If the output power is low on all of the EELEDs, refer to “To check the power supply” on page 5-16.

For the EELED with the low power, locate its associated LED Driver Board Assembly as explained in the adjustment procedure.

Perform the procedure “To check an LED Driver Board Assembly” on

page 5-14.

Perform the procedure “To check the A2A2 LED Modulation Board Assembly”

on page 5-15.

OPTICAL OUT

ACTIVE

key is on. If the

connector as described in “Cleaning Connections for

MODULATION INPUT

connectors. If a BNC short is con-

ACTIVE

MODULATION INPUT

LINE

LEDs do not

con-

5-13

Servicing

Troubleshooting

To check an LED Driver Board Assembly

All of the A5 through A8 LED Driver Board Assemblies are identical.

Remove the power supply cable from J2 on the LED Driver Board Assembly. The end of this cable can be probed to measure all of the dc voltages supplied in the assembly. The following list shows each wire color, its color code, and the voltages present:

• Red (2) wire: +15V

• White/red (92) wire: +5V

• Violet (7) wire: –15V

• Black (0) wire: ground

• White/black (90) wire: ground

Located the two indicator LEDs (green DS1 and yellow DS2) on the LED Driver Board Assembly.

If the green LED is on, the current source driving the EELED is operating correctly. If the yellow LED is on, the EELED temperature stabilization loop is not functioning—the current to the EELED is automatically turned off which turns the green LED off.

For instruments with multiple EELEDs, if the green LED is EELED with another LED Driver Board Assembly:

Move a ribbon cable (W12, W13, W14, or W15) on the A2A2 LED Modulation Board Assembly from a good EELED to the connector for the suspected EELED.

Try to adjust the EELED’s power to within the specification. If the power can be adjusted, replace the LED Driver Board Assembly.

For instruments with a single EELED, if the yellow LED is cable (W12, W13, W14, or W15).

5-14

off,

drive the

off

, check ribbon

Troubleshooting

To check the A2A2 LED Modulation Board Assembly

Check the +5V supply by probing the center pin of J11, J21, J31, or J41. The modulation input cables from the rear panel connect to these jacks.

Check the –15V supply by probing any of the three resistors that are located next to J2. These resistors are loaded in a straight line and have the label “1471” printed on them.

Locate the four large 2W resistors on the assembly. There is one of these resistors for each possible EELED loaded on the assembly. Locate the 2W resistor that is closest to the EELED with the low power.

Measure the voltage on the end of the resistor that is furthest from the EELED. The voltage should measure approximately –1.5V.

The EELED is being driven by the current source and should be turned on.

Servicing

Press the front-panel off. The voltage measured at the 2W resistor should now be approximately +0.7V.

The EELED is turned off.

If the voltage measured across the resistor is incorrect, return the instrument to Agilent Technologies for servicing.

ACTIVE

key so that the front-panel

ACTIVE

light is turned

5-15

Servicing

Troubleshooting

To check the power supply

Check the 6.3A fuse in the rear-panel’s line module FL1. Refer to “To ch eck the

line-power fuse” on page 5-17.

Remove the power supply cable from J2 on one of the A5 through A8 LED Driver Board Assemblies. The end of this cable can be probed to measure all of the dc voltages supplied in the instrument. The following list shows each wire color, its color code, and its purpose:

• Red (2) wire: +15V

• White/red (92) wire: +5V

• Violet (7) wire: –15V

• Black (0) wire: ground

• White/black (90) wire: ground

If no voltages are detected, check that the ac line input voltage at the cable that connects to J1 on the A4 Power Supply Board Assembly. Measure the line voltage across the white/gray/red wire and the gray wire. If the ac line voltage is present, replace the A4 Power Supply Board Assembly.

5-16

Troubleshooting

To check the line-power fuse

Locate the line-input connector on the instrument’s rear panel.

Disconnect the line-power cable if it is connected.

Use a small flat-blade screwdriver to open the pull-out fuse drawer.

The recommended fuse is an IEC 127 5×20 mm, 6.3A, 250 V, Agilent Technologies part number 2110-0703. Notice that an extra fuse is provided in a drawer located on the fuse holder.

Servicing

WARNING

For continued protection against fire hazard, replace line fuse only with same type and ratings, (type T 6.3A/250V for 100/240V operation). The use of other fuses or materials is prohibited.

5-17

Servicing

Performance Tests

The procedures in this section test the Agilent 83437A’s performance using the specifications listed in Chapter 3, “Specifications and Regulatory Informa-

tion” as the performance standard. All of the tests are done manually without

the aid of a computer. None of these tests require access to the interior of the instrument. Allow the Agilent 83437A to warm up for 15 minutes before doing any of the performance tests.

Test 1. Total Output Power 5-19 Test 2. Peak Wavelength Accuracy 5-20 Test 3. Power Stability 5-21

Calibration Cycle

This instrument requires periodic verification of performance. The instrument should have a complete verification of specifications at least once every two years.

CAUTION

Option 022 instruments have an angled-fiber output. Be sure to use an angledfiber patchcord during testing. If you do not have an angled-fiber patchcord available, you can purchase the required accessories from Agilent Technologies. These are the Agilent 81000SI DIN connector interface and the Agilent 81113PC DIN 4108 (angled) to Super-PC patchcord.

5-18

Test 1. Total Output Power

Servicing

Performance Tests

Description

Procedure

Total power is verified using the following devices:

• Power meter The total power for each individual EELED installed in the Agilent 83437A is measured. Because of internal couplers, the specified total power level depends on the number and wavelength of any installed EELED sources. Refer to Chapter 3, “Specifications and Regulatory Information” for the specified values.

Connect a power meter to the Agilent 83437A’s front-panel connector.

If more than one EELED source is installed in the instrument, select one of the rear-panel unterminated. Terminate all other shorts.

This step turns off all sources except the one that you selected.

Measure the total power of the EELED source.

Repeat Step 2 and Step 3 for each EELED source installed in the instrument.

MODULATION INPUT

connectors. Ensure that this connector is

MODULATION INPUT

connectors using BNC

OPTICAL OUT

5-19

Servicing

Performance Tests

Test 2. Peak Wavelength Accuracy

Description

Procedure

Peak wavelength accuracy is verified using the following devices:

• Optical spectrum analyzer

Connect an optical spectrum analyzer to the Agilent 83437A’s front-panel

OPTICAL OUT

Use the optical spectrum analyzer’s marker functions to measure the peak wavelength value of each EELED source installed in the Agilent 83437A.

connector.

5-20

Test 3. Power Stability

Servicing

Performance Tests

Description

Procedure

Power stability is verified using the following devices:

• Power meter (> 30 dB return loss)

This test must be performed in a stable environment where the ambient temperature changes less than 1°C throughout the test.

Turn on the Agilent 83437A and the power meter. Allow them to warm up for one hour.

Connect a power meter to the Agilent 83437A’s front-panel connector.

Remove any BNC terminations on the rear-panel

Configure the power meter to measure total drift in output power over 15 minutes. Start the test.

After 15 minutes have passed, the total output power should not have drifted more than ±0.02 dB for 1310 nm, 1430 nm, and 1550 nm sources. For 1200 nm and 1650 nm sources, total output power should not have drifted more than ±0.03 dB. Record the maximum drift on the following lines:

Maximum drift (15 minutes)

1310 nm, 1430 nm, and 1550 nm sources: ____________ dB 1200 nm and 1650 nm sources: ____________ dB

MODULATION INPUT

OPTICAL OUT

connectors.

Configure the power meter to measure total drift in output power over 6 hours.

After 6 hours have passed, the total output power should not have drifted more than ±0.05 dB. Record the maximum drift on the following line:

Maximum drift (6 hours): ____________ dB

5-21

Servicing

Adjustment Procedures

The Agilent 83437A has only one adjustment procedure, total power. Periodic adjustment is

not

required to maintain safety.

CAUTION

Description

Procedure

To adjust total power

The total power for each individual EELED installed in the Agilent 83437A is adjusted by an associated potentiometer. Because of internal couplers, an EELED’s specified power depends on the number and wavelength of EELED sources installed. Tables are provided at the end of this procedure which provide proper total power values.

To adjust the output power of a particular EELED, you must first identify the EELED’s position on the A2A2 board assembly. Then, you identify the associated LED Driver Board Assembly (A5 through A8) where the potentiometer is located.

Remove the instrument’s top and bottom covers.

Connect a power meter to the Agilent 83437A’s front-panel connector.

OPTICAL OUT

If more than one EELED source is installed in the instrument, select one of the rear-panel unterminated. Terminate all other shorts.

This step turns off all sources except the one that you selected.

5-22

MODULATION INPUT

connectors. Ensure that this connector is

MODULATION INPUT

connectors with BNC

Servicing

Adjustment Procedures

Use the following figure to locate the EELED for the unterminated

INPUT

connector. The EELED is mounted to the left of identified jack. Table 5-6

MODULATION

on page 5-24 can be used to confirm that the correct EELED has been located.

5-23

Servicing

Adjustment Procedures

Table 5-6. EELED Wavelength Values

EELED Package Number EELED Wavelength

1GE3/4409 1200 nm

1GE3/4410 1430 nm

1GE3/4411 1650 nm

1GE3/4412 or 1GE3/4402 1300 nm

1GE3/4413 or 1GE3/4403 1550 nm

Use the following figure to locate the associated LED Driver Board Assembly (A5 through A8) where the potentiometer is located.

Assemblies A5 through A8 are identical with each assembly having a potentiometer labeled R18.

Locate R18 on the LED driver board assembly for the EELED.

Adjust potentiometer R18 on the LED driver board assembly for the proper output power. Use Table 5-7 on page 5-26 to identify the correct power level for your instrument’s configuration.

If the Agilent 83437A has more than one source installed, repeat Step 3 through Step 7 to adjust another source.

5-24

Servicing

Adjustment Procedures

5-25

Servicing

Adjustment Procedures

Table 5-7. Adjustment Power Values

Installed Options Minimum Output Power (dBm)

002 003 004

005

006

1200 nm Source

•–17.0 –21.0

•• –17.0

•–17.0 –17.0

•• –18.0 –17.0 –22.0

•• –13.0

••• –14.0 –18.0

•–14.0 –14.0

•• –18.0 –18.0 –21.0

•• –13.0

••• –17.0 –21.0

•• –18.0 –17.0 –18.0

•• • –18.0 –18.0 –18.0 –22.0

••• –17.0 –17.0

•••• –17.0 –18.0 –22.0

•–21.0 –17.0

••–25.0 –21.0 –21.0

••–17.0

•••–21.0 –21.0

•• –21.0 –21.0 –21.0

•••–25.0 –18.0 –21.0 –22.0

••• –21.0 –17.0

• ••• –21.0 –18.0 –22.0

•• –21.0 –18.0 –18.0

•• • –25.0 –18.0 –18.0 –25.0

•• • –21.0 –17.0

•• •• –25.0 –21.0 –21.0

••• –25.0 –18.0 –21.0 –18.0

•••• –21.0 –21.0 –21.0

••••• –25.0 –21.0 –18.0 –22.0

a. Option 005 deletes the 1550 nm source. b. Specification remains the same value if the Option 001 1550 nm isolator is installed.

1300 nm Source

1430 nm Source

1550 nm Source

–13.0

1650 nm Source

5-26

Servicing

Replacing Instrument Assemblies

This section provides step-by-step procedures to remove and replace the major instrument assemblies. These include the following procedures:

To remove the instrument cover 5-28 To replace the A2 Source assembly 5-28 To route the rear-panel BNC modulation cables 5-29 To replace line filter assembly FL1 5-32 To replace a cable clip 5-33

5-27

Servicing

Replacing Instrument Assemblies

To remove the instrument cover

Disconnect the power cord from the instrument.

Position the instrument so that you are looking at the rear panel.

Use a T-15 TORX driver to back out the screw that attaches the top cover to the instrument.

Note that the screw is permanently secured to the cover.

After the screw is backed out, slide the cover toward the rear of the instrument to remove the cover.

Remove the bottom cover using the same technique as used for the top cover.

Remove the two side covers.

To replace the A2 Source assembly

The A2 assembly, which includes A2A1, A2A2, A2A3, A2MP1, and A2MP2, must be replaced as a complete unit. Individual components cannot be repaired.

Remove the instrument’s top, bottom, and right-side covers.

Remove all cables attached to the A2A2 LED Modulation Board Assembly.

Remove the trim strip located on the top of the front frame.

Use a T-10 TORX driver to remove the six screws that secure the front panel to the front frame. They are located along the top and bottom of the front frame.

Gently move the front panel out to gain access to the back side of the front-

OPTICAL OUT

panel

You may need to cut the cable tie that secures the line switch cable.

Be sure to cover the exposed end of the fiber-optic cable.

Use a T-10 TORX driver to remove the four screws securing the A2 assembly to the instrument’s right-side frame.

Place the instrument on it’s right side.

Use a T-10 TORX driver to remove the three screws securing the A2 assembly

5-28

connector. Unscrew the fiber-optic cable from the connector.

Replacing Instrument Assemblies

to the bottom of the instrument’s main deck sheet metal assembly.

Remove the A2 assembly.

When installing the A2 assembly, observe the following points. Remember that instrument options determine the number of sources and cables that attach to the A2A2 assembly:

• Refer to “To route the rear-panel BNC modulation cables” on page 5-29 for

information on reconnecting the modulation cables to A2A2.

• The ribbon cables that connect to A2A2 can be connected in any order. The

lengths of these cables will usually dictate their position.

To route the rear-panel BNC modulation cables

The following figure shows the cable connections for each of the four possible rear-panel BNC connectors. (The standard Agilent 83437A has only one cable. Additional cables are supplied with options.) Each cable is connected to the indicated jack on the A2A2 assembly. Note that the figure shows cable connections but not the paths. Regardless of the options installed in the instrument, the rear-panel connectors should always be connected to these same jacks.

Servicing

5-29

Servicing

Replacing Instrument Assemblies

5-30

Servicing

Replacing Instrument Assemblies

The figure below shows the correct path for the cables in the instrument. Be sure to route these cables as shown.

5-31

WARNING

Servicing

Replacing Instrument Assemblies

To replace line filter assembly FL1

Although replacing FL1 is straightforward, be sure to observe the following points:

• Tighten the screws that attach FL1 to 6 in-lbs. Do not use the recommended torque for M3 screws. Over tightening these screws will damage the line filter’s flange.

• Observe the following warning about correct wire attachment. The wire color codes in the figure refer to the following cable colors:

54 green/yellow 98 white/gray 918 white/brown/gray

Be sure to solder the wires to FL1 in the correct positions as shown in the following figure. Failure to attach these wires correctly could result in damage to the instrument and injury to the user.

5-32

Replacing Instrument Assemblies

To replace a cable clip

Cable clips are used throughout the instrument to attach cables to sheet-metal housings. They attach with self-adhesive bonds.

Remove the old clip.

Remove any remaining glue.

Clean the surface using isopropyl alcohol.

Remove the paper backing from the bottom of the new clip.

Press the clip firmly onto the surface.

Servicing

5-33

Servicing

Replaceable Parts

In this section, you’ll find figures that identify each mechanical and electrical assembly in the instrument. An Agilent Technologies part number is provided for each available part. The following identification figures are provided:

Table 5-8, “Major Assembies,” on page 5-36 Table 5-9, “Cable Assemblies,” on page 5-38 Table 5-10, “Front-Panel Parts,” on page 5-40 Table 5-11, “Rear-Panel Parts,” on page 5-42 Table 5-12, “Top and Bottom View Parts,” on page 5-44 Table 5-13, “Side View Parts,” on page 5-46 Table 5-14, “Instrument Cover Parts,” on page 5-46

Part ordering information

To order an assembly or mechanical part, quote the Agilent Technologies part number, and indicate the quantity required. To order a part that is not listed, include the following information with the order:

• Agilent 83437A model number

• Instrument serial number

• Description of where the part is located, what it looks like, and its function (if

known)

• Quantity needed

Parts can be ordered by addressing the order to the nearest Agilent Technologies office. Refer to “Agilent Technologies Service Offices” on page 4-5. Cus- tomers within the USA can also use either the direct mail-order system or the direct phone-order system described below. The direct phone-order system has a toll-free phone number available.

5-34

Servicing

Replaceable Parts

Direct mail-order system

Within the USA, Agilent Technologies can supply parts through a direct mailorder system. Advantages of using the system are as follows:

• Direct ordering and shipment from Agilent Technologies

• No maximum or minimum on any mail order. (There is a minimum order

amount for parts ordered through a local Agilent Technologies office when the orders require billing and invoicing.)

• Prepaid transportation. (There is a small handling charge for each order.)

• No invoices

To provide these advantages, a check or money order must accompany each order. Mail-order forms and specific ordering information are available through your local Agilent Technologies office.

Direct phone-order system

The toll-free phone number, (800) 227-8164, is available Monday through Friday, 6 am to 5 pm (Pacific time). Regular orders have a 4-day delivery time.

5-35

Servicing

Replaceable Parts

Table 5-8. Major Assembies

Reference Designator

A1 54710-66512 Keyboard Assembly A2 — Source Assembly (Not orderable, return A2 to HP) A2A1 — Fiber Track Assembly (Not orderable, return A2 to HP) A2A2 — LED Modulation Board Assembly (Not orderable, return A2 to HP) A2A3 — EELED (Not orderable, return A2 to HP) A2A4 — EELED (Not orderable, return A2 to HP) A2A5 — EELED (Not orderable, return A2 to HP) A2A6 — EELED (Not orderable, return A2 to HP) A3 83437-60012 Power Distribution Board Assembly A4 0950-2293 Power Supply Board Assembly A5 83437-60010 LED Driver Board Assembly #1 A6 83437-60010 LED Driver Board Assembly #2 A7 83437-60010 LED Driver Board Assembly #3 A8 83437-60010 LED Driver Board Assembly #4 B1 83437-20006 Fan Assembly FL1 9135-0270 Line-Module Filter. Also part of W2

HP Part Number

Description

5-36

Servicing

Replaceable Parts

5-37

Servicing

Replaceable Parts

Table 5-9. Cable Assemblies

Reference Designator

W1 — Input fiber optic cable (Part of A2 assembly) W2 83437-60008 Line switch cable (includes FL1 and LINE switch), to A4J1 W3 — A3J7 to B1 (Part of B1) W4 83437-60003 Power supply cable, A2A2J2 pin 5 to front-panel “LINE” LED indicator (green wire) W5 83437-60004 Power supply cable, A2A2J1 to front-panel “ACTIVE” LED and A1 assembly W6 83437-60001 Power distribution cable, A4J2 to A3J6 W7 83437-60002 Modulation cable, A3J5 to A2A2J2 W8 83437-60013 Driver #1 cable, 11 inches long, A3J1 to A5J2 W9 83437-60014 Driver #2 cable (Option 002, 003, 004, and 006), 18.5 inches long, A3J2 to A6J2 W10 83437-60014 Driver #3 cable (Option 002, 003, 004, and 006), 18.5 inches long, A3J3 to A7J2 W11 83437-60014 Driver #4 cable (Option 002, 003, 004, and 006), 18.5 inches long, A3J4 to A8J2 W12 83437-60020 Ribbon cable #1, A2A2J91 to A5J1 W13 83437-60021 Ribbon cable #2, (Option 002, 003, 004, and 006), A2A2J92 to A6J1 W14 83437-60021 Ribbon cable #3, (Option 002, 003, 004, and 006), A2A2J93 to A7J1 W15 83437-60021 Ribbon cable #4, (Option 002, 003, 004, and 006), A2A2J94 to A8J1 W16 8120-5056 SMB to BNC cable, 55.5 cm, rear-panel J1 to A2A2J21 W17 8120-5056 SMB to BNC cable, 55.5 cm, rear-panel J2 to A2A2J11 W18 8120-5056 SMB to BNC cable, 55.5 cm, rear-panel J3 to A2A2J31 W19 8120-5056 SMB to BNC cable, 55.5 cm, rear-panel J4 to A2A2J41 — 1252-7513 Ribbon cable clip for W12, W13, W14, and W15.

Agilent Part Number

Description

5-38

Servicing

Replaceable Parts

5-39

Servicing

Replaceable Parts

Table 5-10. Front-Panel Parts

Item

1 83437-00002 1 Front panel, dress 2 5021-8413 1 Front frame 3 83437-00001 1 Front subpanel 4 54714-41903 1 ACTIVE key 5 1990-1213 2 LED lamp IF=15 mA maximum 6 85680-40004 2 LED mount 7 83437-20004 1 LED spacer 8 83410-20003 1 Adapter 9 0515-0430 3 Screw with washer, TORX T10 Pan Head, M3 X 0.5, 6 mm long 10 0535-0042 3 Nut, hex PLSTC-LKG M3 X 0.5 11 1400-0755 3 Component clip 0.75 in x 0.75 in 12 1400-0249 1 Cable tie wrap 13 0380-0019 2 Spacer, round 0.188 IN LNG 14 0590-0106 2 Nut, hex PLSTC-LKG 2-56-THD 15 3050-0891 2 Washer, flat M3.0 3.3 mm inner diameter (not shown, fits between dress

Agilent Part Number

Qty Description

panel and subpanel)

5-40

Servicing

Replaceable Parts

5-41

Servicing

Replaceable Parts

Table 5-11. Rear-Panel Parts

Item

1 83437-00005 1 Rear panel, dress 2 5021-5814 1 Rear frame 3 2110-0703 1 Fuse, 6.3A 250V NTD FE IEC 4 0515-2032 2 Screw, TORX T10 Flat Head, M3 X 0.5, 8 mm long 5 0535-0033 4 Nut, hex M3.5 X 0.6 6 2190-0585 4 Washer, flat HLLC 3.6 mm inside diameter 7 3050-0892 4 Washer, flat MTLC 3.8 mm inside diameter 8 2950-0035 4 Nut, hex 15/32-32 9 2190-0102 4 Washer, lock 0.472" inside diameter 10 6960-0002 3 Hole plug for 0.5 inner diameter hole 11 0515-0372 4 Screw, TORX T10 Pan Head, M3 x 0.5, 8 mm long

Agilent Part Number

Qty Description

5-42

Agilent 83437A Users Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

The Agilent 83437A—At a Glance

General Safety Considerations

Contents

Getting Started

Step 1. Inspect the Shipment

Step 2. Check the Fuse

Step 3. Connect the Line-Power Cable

Returning the Instrument for Service

Preparing the instrument for shipping

Making Measurements

Modulating the Output Light

Performing Stimulus-Response Measurements

To characterize a passive device

Ambient Light Suppression

To suppress ambient light

Cleaning Connections for Accurate Measurements

Choosing the Right Connector

Inspecting Connectors

Cleaning Connectors

Specifications and Regulatory Information

Specifications

Regulatory Information

Declaration of Conformity

Reference

Instrument Options

Accessories

Front-Panel Fiber-Optic Adapters

Power Cords

Agilent Technologies Service Offices

Servicing

General Information

Electrostatic Discharge Information

Troubleshooting

If the output power is low

To check an LED Driver Board Assembly

To check the A2A2 LED Modulation Board Assembly

To check the power supply

To check the line-power fuse

Performance Tests

Test 1. Total Output Power

Test 2. Peak Wavelength Accuracy

Test 3. Power Stability

Adjustment Procedures

To adjust total power

Replacing Instrument Assemblies

To remove the instrument cover

To replace the A2 Source assembly

To route the rear-panel BNC modulation cables

To replace line filter assembly FL1

To replace a cable clip

Replaceable Parts