Agilent Technologies 83430, 90011 User Manual

Agilent 83430A Lightwave Transmitter User’s Guide

Agilent Part No. 83430-90011 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.

ii

The Agilent 83430A—At a Glance

The Agilent 83430A lightwave transmitter is a directly modulated DFB laser source for digital and analog testing up to 2.5 Gb/s. Designed for evaluating the performance of high-speed TDM (time division multiplexed) and WDM (wavelength division multiplexed) optical receivers and systems, it is SDH/SONET compliant.

User Adjustable Features

The Agilent 83430A offers several user adjustable features:

• Digital input threshold — to obtain desired symmetry of optical one and zero levels

• Wavelength — select a preset or tune to a specific value within ±1.25 nm of center

• Extinction ratio — to simulate a wide range of optical signals

iii

The Agilent 83430A—At a Glance

Test Capabilities in Systems

The Agilent 83430A can be used as a general optical source or combined with other instrumentation in systems to make a variety of measurements.

• Optical parametric tests — optical receiver sensitivity, dispersion power penalty of single-mode fiber (with an Agilent 71603A error performance analyzer and Agilent 83446A lightwave clock/data receiver).

• Transceiver waveform testing — including filtered conformance mask testing, extinction ratio, and eye diagram measurements (with an Agilent 83480A digital communications analyzer).

• Jitter tolerance of recovered clock and data — to determine the ability of a receiver to maintain communication in the presence of jitter (with an Agilent 71501C jitter and eye-diagram analyzer).

• Performance testing for WDM optical MUX/DEMUX channels — including BER and system variations caused by cross-phase modulation and Raman effect (with an Agilent 83446A lightwave clock/data receiver, Agilent 71603B error performance analyzer, and Agilent 86120B multiwavelength meter).

For setup and procedures for these and other measurements, see Chapter 2,

“Making Measurements”.

Measurement accuracy—it’s up to you!

Fiber-optic connectors are easily damaged when connected to dirty or damaged cables and accessories. The Agilent 83430A’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 83430A, refer to “Cleaning Con-

nections for Accurate Measurements” on page 2-9.

iv

The Agilent 83430A—At a Glance

Laser classification

The Agilent 83430A is classified as an IEC LASER Class 1. The total power of light energy radiated out of the OPTICAL OUT connector is no greater than +8.1 dBm (6.5 mW). Operator maintenance or precautions are not necessary to maintain safety. No operator accessible controls, adjustments, or performance of procedures result in hazardous radiation exposure.

v

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 83430A 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.

vi

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, refer

to “Line Power Requirements” on page 1-8. Damage to the equipment could

result.

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

vii

Getting Started

The instructions in this chapter show you how to install your Agilent 83430A. 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.

WARNING

CAUTION

To prevent electric shock, disconnect the Agilent 83430A 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.

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

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.

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

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.

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 83430A’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 83430A, refer to “Cleaning Con-

nections for Accurate Measurements” on page 2-9.

1-3

Getting Started

Step 1. Inspect the Shipment

1

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.

2

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

1-4

Getting Started

Step 1. Inspect the Shipment

1-5

Getting Started

Step 2. Check the Fuse

CAUTION

Before connecting the lightwave receiver to the power source, you must set the rear-panel voltage selector correctly to adapt the lightwave receiver to the power source. An improper selector setting can damage the Agilent 83430A when it is turned on.

1

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

2

Disconnect the line-power cable if it is connected.

3

Use a small flat-blade screwdriver to pry open the fuse holder door.

You must remove the voltage tumbler to change the voltage selector. Rotating the voltage tumbler while it is in the line module damages the line module.

4

Remove the voltage tumbler, and replace the tumbler so that the desired line voltage value shows through the small opening in the fuse holder door.

5

The fuse is housed in a small container next to the voltage tumbler. Insert the tip of a screwdriver on the side of the container and gently pull outward to remove the container.

A spare fuse is stored below the line fuse.

1-6

Getting Started

Step 2. Check the Fuse

6

Verify that the value of the line-voltage 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 part

number 2110-0448.

WARNING

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.

1-7

Getting Started

Step 3. Connect the Line-Power Cable

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.

not

Do

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.

1

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 range:90–132 V

nominal:230 VACrange:98–254 V

Frequency nominal: 50 Hz/60 Hzrange: 47–63 Hz

2

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

1-8

Getting Started

Step 3. Connect the Line-Power Cable

3

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

Various power cables are available to connect the Agilent 83430A to ac power outlets unique to specific geographic areas. The cable appropriate for the area to which the Agilent 83430A 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 4-5.

1-9

Getting Started

Step 4. Turn on the Agilent 83430A

• Press the front-panel

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

If the Agilent 83430A 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 1-11.

LINE

key.

LINE

switch disconnects the mains circuits from the mains sup-

1-10

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 4-6 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

1

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

1-11

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.

2

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.

3

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, corrugated 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 material, 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

1-12

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.

4

Seal the carton with strong nylon adhesive tape.

5

Mark the carton “FRAGILE, HANDLE WITH CARE”.

6

Retain copies of all shipping papers.

Getting Started

1-13

2

Using the Agilent 83430A 2-3

Front-panel Features 2-3 Example Uses 2-5

Cleaning Connections for Accurate Measurements 2-9

Making Measurements

In this chapter, you’ll find examples of making measurements using the Agilent 83430A.

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 83430A.

2-2

Making Measurements

Using the Agilent 83430A

Front-panel Features

The following paragraphs describe the Agilent 83430A front-panel features.

LINE

key Disconnects the mains circuit from the mains

supply after the EMC filters and before other parts of the instrument.

SELECT

button Selects between three modulation inputs:

LOG IN AC COUPLED, DIGITAL IN AC COUPLED, and DIGI-

DIGITAL THRESHOLD

ANALOG IN (AC COUPLED)

Modulation input for analog signals. BNC con-

TAL IN DC COUPLED

indicate which input is selected.

Adjusts level of ECL input required for triggering

the on state.

nector.

. Front panel lights come on to

ANA-

2-3

Making Measurements

Using the Agilent 83430A

DIGITAL IN (AC COUPLED)

DIGITAL IN (DC COUPLED)

WAVELENGTH ADJUST

PRESET/VARIABLE

BIAS ADJUST

OPTICAL OUT

knob Allows you to adjust the laser’s output amplitude

connector This connector provides the instrument’s laser

knob Allows you to adjust the laser’s wavelength when

button Toggles between preset laser wavelength or

Modulation input for digital signals. The input is AC coupled. BNC connector.

Modulation input for analog signals. This input is DC coupled. BNC connector.

the variable mode is activated. Press the

VARIABLE

button so that the front-panel light

PRESET/

turns on.

amplitude settings. (Light turns on to indicate you can adjust the setting using the knob.).

when variable mode is activated. Press the

SET/VARIABLE

button so that the front-panel light

PRE-

turns on.

output. A universal adapter is used that can be removed and replaced with different adapters as needed (refer to “Front-Panel Fiber-Optic

Adapters” on page 4-4).

2-4

Making Measurements

Using the Agilent 83430A

Example Uses

Testing optical receiver sensitivity

You can use the Agilent 83430A to measure the minimum sensitivity of an optical receiver. The following figure shows one possible test setup which uses the following equipment:

• Agilent 83430A

• Agilent 71603B error performance analyzer

• Agilent 8156A Option 121 high performance optical attenuator with optical

monitor output

• Agilent 8153A optical power meter

The bit error rate (BER) is monitored as the power to the optical receiver is reduced. The minimum sensitivity limit is found when the BER increases to some pre-determined level above which the receiver performance is unacceptable. Because the Agilent 83430A is a SDH/SONET compliant transmitter in its preset state, the measured BER performance (1 × 10

–10

for SDH/ SONET

system) determines the sensitivity limits of the optical receiver.

The following figure shows the sensitivity of the Agilent 83446A/B lightwave clock/data receiver as the optical receiver under test.

2-5

Making Measurements

Using the Agilent 83430A

.

2-6

Agilent Technologies 83430, 90011 User Manual

The Agilent 83430A—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

Front-panel Features

Example Uses