HP 8168E, 8168D, 8167A, 8168F User Manual

User's Guide

HP 8167A/8D/8E/8F

Tunable Laser Source

SERIAL NUMBERS

This guide applies to the 8167A, 8168D, 8168E and 8168F tunable laser sources.

ABCDE

HP Part No. 08168-91021

Printed in Germany

Second Edition

E0197

Notices

This document contains proprietary

information that is protected by

copyright. All rights are reserved.

No part of this document may be

photocopied, reproduced, or

translated to another language

without the prior written consent of

Hewlett-Packard GmbH.

c



Copyright 1996 by:

Hewlett-Packard GmbH

Herrenberger Str. 130

71034 Boeblingen

Germany

Subject Matter

The information in this document is

subject to change without notice.

Hewlett-Packard makes no warranty

of any kind with regard to this

printed material, including, but not

limited to, the implied warranties of

merchantability and tness for a

particular purpose.

Hewlett-Packard shall not be liable

for errors contained herein or for

incidental or consequential damages

in connection with the furnishing,

performance, or use of this material.

Printing History

New editions are complete revisions

of the guide reecting alterations in

the functionality of the instrument.

Updates are occasionally made to

the guide between editions. The

date on the title page changes when

an updated guide is published. To

nd out the current revision of the

guide, or to purchase an updated

guide, contact your Hewlett-Packard

representative.

First Edition : 1st April 1996 : 08168-91021 : E0496 : 1st June 1996 : 08168-91021 : E0696

Second Edition : 1st January 1997 : 08168-91021 : E0197

Warranty

This Hewlett-Packard instrument

product is warranted against defects

in material and workmanship for a

period of one year (8167A and

8168D) or three years (8168E and

8168F) from date of shipment.

During the warranty period, HP will,

at its option, either repair or replace

products that prove to be defective.

For warranty service or repair, this

product must be returned to a service

facility designated by HP. Buyer shall

prepay shipping charges to HP and

HP shall pay shipping charges to

return the product to Buyer.

However, Buyer shall pay all shipping

charges, duties, and taxes for

products returned to HP from

another country.

HP warrants that its software and

rmware designated by HP for use

with an instrument will execute its

programming instructions when

properly installed on that instrument.

HP does not warrant that the

operation of the instrument,

software, or rmware will be

uninterrupted or error free.

Limitation of Warranty

The foregoing warranty shall not

apply to defects resulting from

improper or inadequate maintenance

by Buyer, Buyer-supplied software or

interfacing, unauthorized

modication or misuse, operation

outside of the environmental

specications for the product, or

improper site preparation or

maintenance.

No other warranty is expressed or

implied. Hewlett-Packard specically

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.

Hewlett-Packard shall not be liable

for any direct, indirect, special,

incidental, or consequential

damages whether based on contract,

tort, or any other legal theory.

Assistance

Product maintenance agreements

and other customer assistance

agreements are available for

Hewlett-Packard products.For any

assistance contact your nearest

Hewlett-Packard Sales and Service

Oce.

Certication

Hewlett-Packard Company certies

that this product met its published

specications at the time of

shipment from the factory.

Hewlett-Packard further certies

that its calibration measurements

are traceable to the United States

National Institute of Standards and

Technology, NIST (formerly the

United States National Bureau of

Standards, NBS) to the extent

allowed by the Institutes's

calibration facility, and to the

calibration facilities of other

International Standards Organization

members.

ISO 9001 Certication

Produced to ISO 9001 international

quality system standard as part of

our objective of continually

increasing customer satisfaction

through improved process control.

Safety Summary

The following general safety precautions must be observed during all phases

of operation, service, and repair of this instrument. Failure to comply with

these precautions or with specic warnings elsewhere in this manual violates

safety standards of design, manufacture

Hewlett-Packard Company assumes no liability for the customer's failure to

comply with these requirements.

, and intended use of the instrument.

General

protective earthing) and has been manufactured and tested according to

international safety standards.

Operation - Before applying power

Additionally, the following shall be observed:

Do not remove instrument covers when operating.

Before the instrument is switched on, all protective earth terminals

cords, auto-transformers and devices connected to it should be connected to a

protective earth via a ground socket. Any interruption of the protective earth

grounding will cause a potential shock hazard that could result in serious

personal injury.

Whenever it is likely that the protection has been impaired, the instrument

must be made inoperative and be secured against any unintended operation.

Make sure that only fuses with the required rated current and of the specied

type (normal blow, time delay, etc.) are used for replacement. The use of

repaired fuses and the short-circuiting of fuseholders must be avoided.

Adjustments described in the manual are performed with power supplied to

the instrument while protective covers are removed. Be aware that energy at

many points may, if contacted, result in personal injury.

Any adjustments, maintenance, and repair of the opened instrument under

voltage should be avoided as much as possible, and when unavoidable, should

be carried out only by a skilled person who is aware of the hazard involved.

Do not attempt internal service or adjustment unless another person, capable

of rendering rst aid and resuscitation is present. Do not replace components

with power cable connected.

Do not operate the instrument in the presence of ammable gases or fumes.

Operation of any electrical instrument in such an enviroment constitutes a

denite safety hazard.

Do not install substitute parts or perform any unauthorized modication to

the instrument.

Be aware that capacitors inside the instrument may still be charged even if

the instrument has been disconnected from its source of supply.

This is a Safety Class 1 instrument (provided with terminal for

Comply with the installation section.

, extension

v

Safety Symbols

The apparatus will be marked with this symbol when it is

necessary for the user to refer to the instruction manual in

order to protect the apparatus against damage.

Caution, risk of electric shock.

Frame or chassis terminal.

Protective conductor terminal.

Hazardous laser radiation.

Warning

Caution

The WARNING sign denotes a hazard. It calls attention to

a procedure, practice or the like, which, if not correctly

performed or adhered to, could result in injury or loss of

life. Do not proceed beyond a WARNING sign until the

indicated conditions are fully understood and met.

The CAUTION sign denotes a hazard. It calls attention to

an operating procedure, practice or the like, which, if not

correctly performed or adhered to, could result in damage to

or destruction of part or all of the equipment. Do not proceed

beyond a CAUTION sign until the indicated conditions are fully

understood and met.

vi

Initial Safety Information for the Tunable Laser

Source

The Specications for these instruments are as follows:

Laser Type

Laser Class

According to 21 1 1 1 IIIb

CFR 1040.10 (USA)

According to 3A 3A 3A 3A

IEC 825-1 (Non-USA)

EN 60825-1 Europe

Permissible Output Power (CW)

Beam Diameter

Numerical Aperture

Wavelength

HP 8167A HP 8168D HP 8168E HP 8168F

Fabry Fabry Fabry Fabry

Perot-Laser Perot-Laser Perot-Laser Perot-Laser

InGaAsP InGaAsP InGaAsP InGaAsP

<

1.6mW

9m 9m 9m 9m

0.1 0.1 0.1 0.1

1280-1330nm 1490-1565nm 1475-1575nm 1450-1590nm

<

1.6mW

<

1.6mW

<

9.9mW

Note

USA

The laser safety warning labels are xed on the instrument

(except the 8168F, see label below).

vii

Class IIIb stickers, required for 8168F in USA only

Caution

Note

You

MUST

Center for repair and calibration.

viii

The use of optical instruments with this product will increase

eye hazard.

Non-USA

A sheet of laser safety warning labels are included with the

instrument. You

onto the outside of the instrument, in a position where they are

clearly visible to anyone using the instrument.

return instruments with malfunctioning laser boxes to an HP Service

MUST

stick the labels in the local language

The instrument has built in safety circuitry that will disable the optical output

in the case of a fault condition.

Warning

Warning

Warning

Warning

Use of controls or adjustments or performance of

procedures other than those specied for the laser source

may result in hazardous radiation exposure.

Refer Servicing only to qualied and authorized personnel.

Do not enable the laser when there is no ber attached to

the optical output connector.

The optical output connector is at the bottom right of the

instrument front panel.

The laser is enabled by pressing the gray button beside

the optical output connector on the front panel. The laser

is enabled when the green LED on the front panel of the

instrument is lit.

Under no circumstances look into the end of an optical

cable attached to the optical output when the device is

operational.

The laser radiation is not visible to the human eye, but it

can seriously damage your eyesight.

ix

Sicherheitsinformation fur Laser Quellen

Die Spezikationen f ur die Ger ate sind wie folgt:

HP 8167A HP 8168D HP 8168E HP8168F

Laser Typ

Laser Klasse

Gem a IEC 825-1 3A 3A 3A 3A

(EN60825-1 Europa)

Zulassige Ausgangsleistung

Strahldurchmesser

Numerische Apertur



Wellenl

ange

Hinweis

1280-1330nm 1490-1565nm 1470-1575nm 1450-1590nm

Fabry Fabry Fabry Fabry

Perot-Laser Perot-Laser Perot-Laser Perot-Laser

InGaAsP InGaAsP InGaAsP InGaAsP

<

1.6mW

9m 9m 9m 9m

0.1 0.1 0.1 0.1

<

1.6mW

<

1.6mW

<

9.9mW

Ein Blatt mit Laser Warnaufklebern ist jedem Ger at beigef ugt.

Die Aufkleber m ussen in der Landessprache,fur den Anwender

gut sichtbar, an der Auenseite des Ger ates angebracht werden.

Ger ate mit defekten Laser m ussen zur Reparatur oder zur Kalibration an ein HP

Service B uro geschickt werden.

Das Ger at hat eine eingebaute Sicherheitsschaltung, die den Laserausgang im

Falle einer St orung abschaltet.

Warnung

x

Bedienung, Abgleicharbeiten oder die Durchfuhrung von

Tests, die nicht im Handbuch angegeben sind, konnen zum

Austritt gefahrlicher Strahlung fuhren.

Warnung

Reparaturarbeiten durfen nur von qualiziertem und

bevollmachtigtem Personal durchgefuhrt werden.

Warnung

Warnung

Laser nicht ohne angeschlossenes Glasfaserkabel

einschalten.

Der optische Ausgang bendet sich am unteren rechten

Teil der Frontplatte. Mit dem danebenliegenden grauen

Druckschalter wird der Laser ein- bzw. ausgeschaltet. Bei

eingeschaltetem Laser leuchtet eine grune LED an der

Frontplatte des Einschubes.

Wenn der Laser eingeschaltet ist, darf unter keinen

Umstanden in das Ende des optischen Kabels oder in den

Laserausgang am Gerat geschaut werden.

Der Laserstrahl ist fur das menschliche Auge unsichtbar,

kann aber das Sehvermogen ernsthaft verletzen.

xi

Informations et Consignes de Securite Relativesa

l'Utilisation des Lasers.

Les Sp ecications de l'appareil sont les Suivantes:

HP 8167A HP 8168D HP 8168E HP8168F

Type du Laser

Classe du Laser

Conforme au IEC 825-1 3A 3A 3A 3A

(EN 60825-1 Europe)

Permit Puissance de Sortie

Diametre du Faisceau

Ouverture Numerique

Longueur d'Onde

Remarque

1280-1330nm 1490-1565nm 1475-1575nm 1450-1590nm

Fabry Fabry Fabry Fabry

Perot-Laser Perot-Laser Perot-Laser Perot-Laser

InGaAsP InGaAsP InGaAsP InGaAsP

<

1.6mW

9m 9m 9m 9m

0.1 0.1 0.1 0.1

<

1.6mW

<

1.6mW

<

9.9mW

Les etiquettes de s ecurit e sont incluses dans l'appareil. Il est

obligatoire de coller une etiquette en langage local al'exterieur

de l'appareil de telle sorte qu'elle soit parfaitement visible par

l'utilisateur.

Il est recommand e de xer l' etiquette de s ecurit e sur la partie inf erieure gauche

de la face avant de l'appereil.

En cas de mauvais fonctionnement du laser, celui doit ^etre renvoy e

imperativement accompagn e de l'appareil dans un centre de maintenance

Hewlett-Packard ou agr ee Hewlett-Packard pour r eparation et calibration.

L'appareil comporte un syst eme de s ecurit e mettant hors service la sortie

optique en cas de mauvais fonctionnement du laser.

xii

Attention

L'utilisation du laser en dehors de ses limites de

performances et des procedures denies par HP peut

conduirea une exposition aux radiations dangereuse pour

l'utilisateur.

Attention

Attention

Attention

Seul le personnel autorise par HP est qualie pour

intervenir sur le laser.

Ne pas mettre le laser sous tension sans s'^etre assure

qu'une bre optique est bien xee sur le connecteur.

Le connecteur de sortie optique est situe au bas de la face

avant de l'appareil.

La mise en service du laser s'eectue par la pression du

bouton gris situea cote de la sortie optique au bas de la

face avant de l'appareil. L'illumination de la LED verte

indique que le laser est en activite.

Ne tentez en aucun cas de regarder l'extremite de la bre

optique attachee au connecteur lorsque le laser est en

activite.

Bien que la lumiereemise par le laser ne soit pas visible elle

peut cependant^etre dangereuse pour la vue.

xiii

Introduction

This guide is arranged into four categories:

Getting Started

This section gives an introduction to the instrument, and aims to make the

instrument familiar to you: Chapter 1.

Local Control

This is the information on how to control the instrument from the front panel:

Chapters 2 and 3.

Remote Control

This is the information on how to control the instrument over the HP-IB

is made of general information for using the HP-IB

some programming examples.: Chapters 4, 5, and 6.

Additional Information

This is supporting information of a non-operational nature. This contains

installation information, accessories, specications, function tests, cleaning

procedures, and error codes: Appendices A through G.

, a command reference, and

. This

Attenuator

xiv

Some information in this manual applies only to the tunable

laser source with the built in optical attenuator (option 003).

This paragraph is marked the way that all the passages which

only apply to the attenuator option are marked in this manual.

Contents

1. Getting Started

What is a Tunable Laser Source? ................ 1-1

A description of the Front Panel .. ...... ...... .. 1-2

Starting the 8168F . . . . . . . . . . . . . . . . . . . . . . . 1-3

Getting Help . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Changing the Value of a Parameter ............... 1-5

Making Big Changes to a Parameter . . . . . . . . . . . . . . 1-6

Making a Small Change to a Parameter ............ 1-6

Setting a Parameter to its Default Value . . . . . . . . . . . . 1-7

If You Make a Mistake .. ...... ...... ..... . 1-7

If the Parameter Will Not Change . . . . . . . . . . . . . . . 1-8

A Sample Session ...... ...... ...... ..... 1-8

Measuring the Power of a Modulated Signal . . . . . . . . . . 1-8

Setting the Wavelength . . . . . . . . . . . . . . . . . . . 1-9

Setting the Modulated Power . . . . . . . . . . . . . . . . 1-9

Measuring a Wavelength Characteristic ............ 1-11

Setting Up the Wavelength Sweep ............. 1-11

Performing the Wavelength Characteristic Measurement ... 1-12

2. Setting Wavelength and Power

Setting the Wavelength . . . . . . . . . . . . . . . . . . . . . 2-2

Setting the Wavelength Directly ...... ...... ... 2-2

Setting a Relative Wavelength ...... ...... .... 2-3

Changing the Base Wavelength . . . . . . . . . . . . . . . 2-3

Performing a Wavelength Sweep ................ 2-4

Setting the Wavelength Sweep ................ 2-5

Setting the Maximum Power for the Sweep Range . . . . . . . 2-5

Executing an Automatic Sweep . . . . . . . . . . . . . . . . 2-6

Performing a Manual Sweep ........ ...... ... 2-6

Setting the Power ....................... 2-8

Setting the Output Power of a CW Signal ........... 2-8

Setting Power and Attenuation . . . . . . . . . . . . . . . 2-9

Contents-1

What is Excessive Power? .................. 2-9

The Analog Output ..................... 2-9

Setting a Modulated Signal . . . . . . . . . . . . . . . . . . . 2-10

Using the Internal Modulation ................ 2-11

Setting the Output Power of a Modulated Signal . . . . . . . 2-11

Setting the Frequency of a Modulated Signal ........ 2-11

The Modulation Output .................. 2-12

Using External Modulation . . . . . . . . . . . . . . . . . . 2-12

Setting the Output Power of a Modulated Signal . . . . . . . 2-13

The Modulation Input .. ...... ...... ..... 2-13

Using Coherence Control . . . . . . . . . . . . . . . . . . . . 2-13

Setting the Output Power of a Coherence Control Signal .... 2-13

The Coherence Control Uncal Power ............. 2-14

3. Other Functions

Storing and Recalling Instrument Settings . . . . . . . . . . . . 3-1

Using the System Utilities ................... 3-2

Switching the Instrument into Stand-By . . . . . . . . . . . . 3-3

Increasing the Lifetime of the Display . . . . . . . . . . . . 3-3

Setting the HP-IB Address .................. 3-4

Setting the Modulation Output .... ...... ...... 3-4

Getting Information about the Instrument . . . . . . . . . . . 3-4

Setting the Date and Time ...... ...... ...... 3-4

Performing a Selftest . . . . . . . . . . . . . . . . . . . . .

Auxiliary Functions ........ ...... ...... .. 3-6

Viewing the Power as a Function of Wavelength . . . . . . . . 3-6

Setting the Peak Power ................... 3-7

Passive Component Test (PACT).. ...... ...... .. 3-7

Automatic Realignment ................... 3-7

Secure .......... ...... ...... ..... 3-9

Lock the Instrument . . . . . . . . . . . . . . . . . . . . 3-9

Change the Password .. ...... ..... ...... 3-11

3-5

4. Programming the Tunable Laser Source

HP-IB Interface ........................ 4-1

Setting the HP-IB Address .. ...... ...... ..... 4-3

Returning the Instrument to Local Control ........... 4-3

How the Tunable Laser Source Receives and Transmits Messages . 4-3

How the Input Queue Works ................. 4-3

Clearing the Input Queue . . . . . . . . . . . . . . . . . . 4-4

The Output Queue . . . . . . . . . . . . . . . . . . . . . . 4-4

Contents-2

The Error Queue . . . . . . . . . . . . . . . . . . . . . . . 4-4

Some Notes about Programming and Syntax Diagram Conventions 4-5

Short Form and Long Form.................. 4-5

Command and Query Syntax ................. 4-5

5. Remote Commands

Units ............................. 5-1

Command Summary ...................... 5-2

The Common Commands . . . . . . . . . . . . . . . . . . . . 5-5

Common Status Information ................. 5-5

SRQ, The Service Request ................. 5-6

*CLS ............................ 5-7

*ESE ............................ 5-7

*ESE? . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

*ESR? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

*IDN? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9

*OPC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

*OPC? ........ ...... ...... ...... 5-10

*OPT? ...... ...... ...... ...... ... 5-10

*RCL ............................ 5-11

*RST ............................ 5-11

*SAV ............................ 5-12

*SRE ............................

*SRE? . . . . . . . . . . . . . . . . . . . . . . . . . . .

*STB? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13

*TST? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14

*WAI ............................ 5-16

:DISPlay Commands ...................... 5-16

:DISPlay:ENABle ...................... 5-16

:DISPlay:ENABle? . . . . . . . . . . . . . . . . . . . . . 5-16

:LOCK Commands ...... ...... ...... ..... 5-17

:LOCK ........................... 5-17

:LOCK? . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17

:OUTPut Commands ...... ...... ...... .... 5-17

:OUTPut[:STATe].... ...... ...... ...... . 5-17

:OUTPut[:STATe]? ........ ...... ...... . 5-18

[:SOURce] Commands ..................... 5-18

[:SOURce]:AM:INTernal:FREQuency . . . . . . . . . . . . . . 5-18

[:SOURce]:AM:INTernal:FREQuency? ...... ...... 5-19

[:SOURce]:AM:SOURce . . . . . . . . . . . . . . . . . . . . 5-19

[:SOURce]:AM:SOURce? .................. 5-19

5-12

5-13

Contents-3

[:SOURce]:AM:STATe......... ...... ...... 5-20

[:SOURce]:AM:STATe? ................... 5-20

[:SOURCE]:MODOUT . . . . . . . . . . . . . . . . . . . . . 5-21

[:SOURCE]:MODOUT? ........ ...... ..... 5-21

[:SOURce]:POWer:ATTenuation .... ...... ...... 5-22

[:SOURce]:POWer:ATTenuation? . . . . . . . . . . . . . . . 5-22

[:SOURce]:POWer:ATTenuation:AUTO............. 5-23

[:SOURce]:POWer:ATTenuation:AUTO? ........... 5-23

[:SOURce]:POWer:ATTenuation:DARK............. 5-24

[:SOURce]:POWer:ATTenuation:DARK? ........... 5-24

[:SOURce]:POWer[:LEVel][:IMMediate][:AMPlitude] . . . . . . . 5-25

[:SOURce]:POWer[:LEVel][:IMMediate][:AMPlitude]? ..... 5-25

[:SOURce]:POWer:UNIT ................... 5-26

[:SOURce]:POWer:UNIT? .. ...... ...... .... 5-26

[:SOURce]:WAVElength[:CWj:FIXED] ...... ...... . 5-27

[:SOURce]:WAVElength[:CWj:FIXED]? . . . . . . . . . . . . 5-27

[:SOURce]:WAVElength:REFerence? . . . . . . . . . . . . . . 5-28

[:SOURce]:WAVElength:REFerence:DISPlay .......... 5-28

[:SOURce]:WAVElength:FREQuency . . . . . . . . . . . . . . 5-28

[:SOURce]:WAVElength:FREQuency? ............ 5-28

:STATus Commands ...................... 5-29

:STATus:OPERation:CONDition? ............... 5-30

:STATus:OPERation:ENABle .................

:STATus:OPERation:ENABle? . . . . . . . . . . . . . . . .

:STATus:OPERation[:EVENt]? . . . . . . . . . . . . . . . . . 5-31

:STATus:OPERation:NTRansition ........ ...... . 5-32

:STATus:OPERation:NTRansition? . . . . . . . . . . . . . . 5-32

:STATus:OPERation:PTRansition ............... 5-32

:STATus:OPERation:PTRansition? . . . . . . . . . . . . . . 5-32

:STATus:QUEStionable:CONDition? .............. 5-33

:STATus:QUEStionable:ENABle . . . . . . . . . . . . . . . . 5-33

:STATus:QUEStionable:ENABle? .............. 5-33

:STATus:QUEStionable[:EVENt]? ............... 5-34

:STATus:QUEStionable:NTRansition . . . . . . . . . . . . . . 5-34

:STATus:QUEStionable:NTRansition? .......... .. 5-34

:STATus:QUEStionable:PTRansition . . . . . . . . . . . . . . 5-35

:STATus:QUEStionable:PTRansition? ............ 5-35

:STATus:PRESet ...... ...... ...... ..... 5-35

:SYSTem Commands ...................... 5-36

:SYSTem:DATe........................ 5-36

:SYSTem:DATe? .. ...... ...... ...... .. 5-36

5-31

5-31

Contents-4

:SYSTem:ERRor? . . . . . . . . . . . . . . . . . . . . . . . 5-36

:SYSTem:TIMe . . . . . . . . . . . . . . . . . . . . . . . . 5-37

:SYSTem:TIMe? ...................... 5-37

:TRACe Commands . . . . . . . . . . . . . . . . . . . . . . . 5-37

:TRACe:CATalog? ........ ...... ...... .. 5-37

:TRACe:POINts?<trace name>............... 5-38

:TRACe[:DATa]?<trace name>...... ...... .... 5-38

Other Commands ....................... 5-38

WAVEACT.......................... 5-38

6. Programming Examples

Example 1 - Checking Communication ............. 6-2

Example 2 - Status Registers and Queues ............ 6-3

Example 3 - Measuring the Power of a Modulated Signal . . . . . 6-7

Example 4 - Measuring a Wavelength Characteristic .. ..... 6-10

Example 5 - Increased Tuning Linearity . . . . . . . . . . . . . 6-12

A. Installation

Safety Considerations ..................... A-1

Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . A-1

AC Line Power Supply Requirements ........ ...... A-2

Line Power Cable .......... ..... ...... . A-2

Changing the Battery ...... ...... ...... ..

Changing the Fuse . . . . . . . . . . . . . . . . . . . . . .

Operating and Storage Environment .. ...... ...... A-6

Temperature . . . . . . . . . . . . . . . . . . . . . . . . . A-6

Humidity .......................... A-6

Instrument Positioning and Cooling . . . . . . . . . . . . . . A-6

Switching on the Tunable Laser Source ............. A-7

Self test . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7

Initializing . . . . . . . . . . . . . . . . . . . . . . . . . . A-7

Stabilizing . . . . . . . . . . . . . . . . . . . . . . . . . . A-8

Stabilizing during Operation ................ A-8

Signal Outputs. ........................ A-9

Optical Output . . . . . . . . . . . . . . . . . . . . . . . . . A-9

HP-IB Interface ........................ A-10

Connector . . . . . . . . . . . . . . . . . . . . . . . . . . A-10

HP-IB Logic Levels . . . . . . . . . . . . . . . . . . . . . . A-11

Claims and Repackaging .................... A-12

Return Shipments to HP ................... A-12

A-4

A-4

Contents-5

B. Accessories

Mainframe .......................... B-1

Options . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Option 003: ........................ B-2

Option 007: ........................ B-2

Connector Interfaces and Other Accessories . . . . . . . . . B-2

Option 021, Straight Contact Connector . . . . . . . . . . B-3

Option 022, Angled Contact Connector .......... B-4

Option 023, Diamond HMS-10/HRL Angled, Non-Contact

Connector ...................... B-5

HP-IB Cables and Adapters . . . . . . . . . . . . . . . . . . . B-7

C. Specications

Denition of Terms ...................... C-1

Performance Specications . . . . . . . . . . . . . . . . . . . C-4

Supplementary Performance Characteristics . . . . . . . . . . . C-7

Characteristics . . . . . . . . . . . . . . . . . . . . . . . . C-7

Operating Modes . . . . . . . . . . . . . . . . . . . . . . . C-7

Internal Modulation .................... C-7

External modulation . . . . . . . . . . . . . . . . . . . . C-7

Coherence Control . . . . . . . . . . . . . . . . . . . . . C-7

General . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7

Polarization maintaining ber . . . . . . . . . . . . . . . .

HP-IB Interface ......................

Passive Component Test Software . . . . . . . . . . . . . . C-8

Laser Class ........................ C-8

Environmental ........ ...... ...... .. C-8

Listed options . . . . . . . . . . . . . . . . . . . . . . . C-9

Other Specications ...................... C-9

Declaration of Conformity ................... C-10

C-7

C-8

D. Performance Tests

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

Equipment Required . . . . . . . . . . . . . . . . . . . . . . D-1

Test Record .......................... D-2

Test Failure .......................... D-3

Instrument Specication .................... D-3

Wavelength Tests ....................... D-3

Relative Wavelength Accuracy ................ D-5

Wavelength Repeatability .. ...... ...... .... D-6

Power Tests . . . . . . . . . . . . . . . . . . . . . . . . . . D-7

Contents-6

Maximum Output Power .... ...... ...... ... D-7

Power Linearity . . . . . . . . . . . . . . . . . . . . . . . D-10

Power Flatness over Wavelength ............... D-14

Power Stability .......... ...... ...... . D-15

Source Spontaneous Emission ................. D-16

E. Cleaning Procedures

The Cleaning Kit . . . . . . . . . . . . . . . . . . . . . . . . E-1

Other Cleaning Tools . . . . . . . . . . . . . . . . . . . . . E-3

Preserving Connectors . . . . . . . . . . . . . . . . . . . . . E-4

Cleaning Instrument Housings ................. E-4

Cleaning Procedures . . . . . . . . . . . . . . . . . . . . . . E-5

Cleaning Cable Connectors . . . . . . . . . . . . . . . . . . E-5

Cleaning Connector Adapters . . . . . . . . . . . . . . . . . E-6

Cleaning Connector Interfaces ................ E-7

Cleaning Bare Fiber Adapters . . . . . . . . . . . . . . . . . E-8

Cleaning Bare Fiber Ends .. ...... ..... ..... E-8

Cleaning Lenses . . . . . . . . . . . . . . . . . . . . . . . E-9

Cleaning Large Area Lenses and Mirrors . . . . . . . . . . . . E-10

Cleaning Fixed Connector Interfaces .......... ... E-11

Cleaning Optical Glass Plates . . . . . . . . . . . . . . . . . E-11

Cleaning Physical Contact Interfaces .... ...... ... E-11

Cleaning Recessed Lens Interfaces .............. E-12

Cleaning Fragile Optical Devices ........ ...... . E-12

Cleaning Metal Filters or Attenuator Gratings ......... E-13

F. Error Messages

Display Messages ........ ...... ...... ... F-1

HP-IB Messages ........................ F-3

Instrument Specic Errors .................. F-3

Command Errors . . . . . . . . . . . . . . . . . . . . . . . F-3

Execution Errors ...................... F-6

Device-Specic Errors .... ...... ...... .... F-7

Query Errors ........................ F-8

Contents-7

G. Backdating

Initial Safety Information for the Tunable Laser Source ..... G-1

Earlier models . . . . . . . . . . . . . . . . . . . . . . . . . G-1

Specications ......................... G-2

Performance Specications . . . . . . . . . . . . . . . . . . G-2

Supplementary Performance Characteristics . . . . . . . . . G-2

Index

Contents-8

Figures

1-1. The Tunable Laser Source Front Panel ...... ...... 1-2

1-2. Starting Screen for the 8168F . . . . . . . . . . . . . . . . . 1-3

1-3. \Secure: Unlock Instrument" Screen ............. 1-4

1-4. \Secure" Screen . . . . . . . . . . . . . . . . . . . . . . . 1-4

1-5. A Summary of the Help Hard- and Softkeys . . . . . . . . . . 1-5

1-6. The Help Topics Menu .................... 1-5

1-7. Connecting the Instruments for the Sample Session .. .... 1-9

1-8. Tunable Laser Source Display after Setting Up W

Power . . . . . . . . . . . . . . . . . . . . . . . . . .

1-9. Tunable Laser Source Display during Setting Up for the

Wavelength Sweep .................... 1-11

2-1. A Summary of the additional Output Power Softkeys for the

Attenuator Option .................... 2-2

2-2. Setting the Wavelength Directly .... ...... ..... 2-2

2-3. Setting a Relative Wavelength .......... ...... 2-3

2-4. Setting Up for a Wavelength Sweep . . . . . . . . . . . . . . 2-4

2-5. The Parameters for a Wavelength Sweep .......... . 2-5

2-6. Performing a Manual Sweep ...... ...... ..... 2-7

2-7. Setting the Output Power of a CW Signal ........... 2-8

2-8. The Modulated Signal .................... 2-11

2-9. Setting the Output Power of an Internally Modulated Signal .. 2-11

2-10. External Modulation and Output Power . . . . . . . . . . . . 2-12

2-11. Setting the Output Power of an Externally Modulated Signal . . 2-13

2-12. Setting the Output Power of a Coherence Controlled Signal . . . 2-14

2-13. The Coherence Control Uncalibrated Power and the Maximum

Power Level ....................... 2-14

3-1. User Setting Number 1 . . . . . . . . . . . . . . . . . . . . 3-1

3-2. Summary of the Setting Hard- and Softkeys . . . . . . . . . . 3-2

3-3. The System Screen . . . . . . . . . . . . . . . . . . . . . . 3-3

3-4. Summary of the System Hard- and Softkeys . . . . . . . . . . 3-3

3-5. Auxiliary Functions (8167A, 8168D/E) . . . . . . . . . . . . . 3-6

3-6. Auxiliary Functions (8168F) ................. 3-6

avelength and

1-10

Contents-9

3-7. Auto Realignment ...................... 3-8

3-8. \Secure" screen . . . . . . . . . . . . . . . . . . . . . . . 3-9

3-9. \Secure: Lock Instrument" screen .............. 3-10

3-10. \Secure" screen - instrument is locked .... ...... .. 3-10

3-11. \Secure: Unlock Instrument" screen ............. 3-10

3-12. \Secure: Change Password" screen . . . . . . . . . . . . . . 3-11

3-13. \Secure: Change Password": Enter new password . . . . . . . 3-11

3-14. \Secure: Change Password": Enter new password again . . . . 3-11

5-1. Common Status Registers . . . . . . . . . . . . . . . . . . . 5-6

5-2. The Status Registers . . . . . . . . . . . . . . . . . . . . . 5-30

6-1. Connecting the Instruments for the Sample Session .... .. 6-8

6-2. Measurement setup for Increased Tuning Linearity ...... 6-12

6-3. Flow chart describing Increased Tuning Linearity program. . . . 6-13

A-1. Line Power Cables - Plug Identication ............ A-2

A-2. Rear Panel Markings . . . . . . . . . . . . . . . . . . . . . A-4

A-3. Releasing the Fuse Holder .......... ...... .. A-5

A-4. The Fuse Holder . . . . . . . . . . . . . . . . . . . . . . . A-5

A-5. Correct Positioning of the Tunable Laser Source . . . . . . . . A-7

A-6. PMF Output . . . . . . . . . . . . . . . . . . . . . . . . . A-10

A-7. HP-IB Connector . . . . . . . . . . . . . . . . . . . . . . . A-11

B-1. Tunable Laser Source Options Overview . . . . . . . . . . . . B-2

B-2. Tunable Laser Source Option 021 Conguration ........ B-3

B-3. Tunable Laser Source Option 022 Conguration ........ B-5

B-4. Tunable Laser Source Option 023 Conguration ........ B-6

C-1. Maximum Specied Output Power for 8168D, E and F (without

options) ......................... C-1

D-1. Test Setup for the Wavelength Tests . . . . . . . . . . . . . . D-4

D-2. Test Setup for the Maximum Output Power Test (except HP

8168F) . . . . . . . . . . . . . . . . . . . . . . . . . . D-8

D-3. Test Setup for the Maximum Output Power Test (HP 8168F only) D-9

D-4. Test Setup for the Power Tests (except Maximum Output Power) D-11

D-5. Test Setup for the Source Spontaneous Emission Test...... D-17

Contents-10

Tables

4-1. HP-IB Capabilities . . . . . . . . . . . . . . . . . . . . . . 4-2

5-1. Units and Allowed Mnemonics ................ 5-1

5-2. Common Command Summary . . . . . . . . . . . . . . . . . 5-2

5-3. Command List . . . . . . . . . . . . . . . . . . . . . . . . 5-3

5-4. Reset State (Default Setting) .... ...... ...... . 5-12

5-5. Specied Wavelength range . . . . . . . . . . . . . . . . . . 5-27

6-1. Program Description: Increased Tuning Linearity ...... . 6-16

A-1. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . A-6

Contents-11

Getting Started

This chapter gives you basic information on how you can operate the tunable

laser source from the front panel.

What is a Tunable Laser Source?

A tunable laser source is a laser source for which the wavelength is not xed.

The Hewlett-Packard tunable laser sources also allow you to set the output

power, and to choose between continuous wave or modulated output power

.

1

1

Note

The single greatest factor aecting the performance of the

tunable laser source, as with all ber optic measurements, is the

cleanliness of the connectors. Ensure that your connectors are

always clean. For cleaning instructions, see Appendix E.

Getting Started 1-1

1

A description of the Front Panel

Figure 1-1. The Tunable Laser Source Front Panel

A softkey is a key whose function changes depending on the keys that you have

pressed before. The function of a softkey is shown on the display above the

softkey.

The memory card drive allows you to load replacement, or additional, software

to increase the capabilities of your tunable laser source.

There are six function keys. These allow you

to set the wavelength, or to perform a wavelength sweep.

to set the output power,

to save the wavelength and output power setting,

to check or change the system conguration: to test the instrument, to switch

o the laser and display, to change the HP-IB Address, to select whether the

internal modulation signal is available at the Modulation Output constantly,

or only when the power is being output, or to get information about the

instrument and the software revision,

to get help information (see \Getting Help" in the next section of this

chapter), or

to perform an auxiliary application such as examine the power characteristic,

or to set the instrument for maximum power output.

The numeric keypad, the cursor keys, and the modify knob are used to edit

parameters.

1-2 Getting Started

The modulation output gives a TTL level signal of the same frequency as the

internal modulating signal.

The modulation input allows you to input a signal to modulate the power of the

optical output.

The analog output gives a dc-signal proportional to the output power. The

relationship between this voltage level and the output power is not calibrated,

but is approximately 1mV for each 1W.

At the back of the 8168F, you also have a Remote Interlock Connector. This

is to protect the user from injury. If the short-circuit at this BNC connector is

opened, the laser is switched o immediately and cannot be switched on until it

is closed again.

Starting the 8168F

When you turn on the 8168F, the instrument is locked. This is to prevent

unauthorized persons from using this Laser Safety Class IIIb instrument. The

Starting screen for the 8168F is shown below:

1

If you have not set a new password, you also see the message:

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

default pwd: 8168, please change it!

\Secure" screen until you set a new password (see \Secure" in Chapter 3).

To unlock the instrument, press

Figure 1-2. Starting Screen for the 8168F

. This message appears in the

NNNNNNNNNNNNNNNNNNNN

Unlock

.You see the following screen:

Getting Started 1-3

1

Figure 1-3. \Secure: Unlock Instrument" Screen

Enter the 4-gure password using the DATA keys. The default password is 8168,

although you can change this from the AUX menu (see \Secure" in Chapter 3).

When you enter the correct password, the instrument is unlocked, and you see

the following screen:

Figure 1-4. \Secure" Screen

NNNNNNNNNNNNNN

Press

Exit

, or any of the function keys, to view the main screen.

Getting Help

5

Press

4

When you press this key, the rst help screen is displayed, this is either the last

screen that was used, or the screen with the limit values for the parameters.

1-4 Getting Started

HELP

to get help.