Agilent Technologies 8504B User manual

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FINAL TRIM SIZE : 7.5 in x 9.0 in

User's Guide

Agilent 8504B

Precision

Reectometer

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FINAL TRIM SIZE : 7.5 in x 9.0 in

Agilent part number: 08504-90055

Printed in US

AJuly 2001

Lightwave Division

3910 Brickway Boulevard,

Santa Rosa, CA

95403, US

Instrument Support Center: (800) 403-0801

Notice

The information contained in this document is subject to change

without notice

.Agilent T

echnologies makes no warranty of any kind

with regard to this material, including but not limited to, the implied

warranties of merchantability and tness for aparticular purpose

. Agilent

echnologies 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

Government is subject to restrictions as set forth in subparagraph (c) (1) (ii)

of the Rights in T

echnical Data and Computer Software clause at DF

ARS

252.227-7013 for DOD agencies

,and subparagraphs (c) (1) and (c) (2) of the

Commercial Computer Software Restricted Rights clause at F

AR 52.227-19 for

other agencies



echnologies 1992, 1993, 1994, 1995, 2001

written permission is prohibited, except as allowed under the copyright laws

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FINAL TRIM SIZE : 7.5 in x 9.0 in

ARNING

This is aIEC Class 1LED product. Do not stare into beam or view

directly with optical instruments

.LED radiation is emitted from the

front-panel

TEST PORT

and

REFERENCE EXTENSION A

connectors

ARNING

If this instrument is not used as specied, the protection provided by the

equipment could be impaired. This instrument must be used in anormal

condition (in which all means for protection are intact) only

ARNING

No operator serviceable parts inside

.Refer servicing to qualied

personnel. T

oprevent electrical shock and LED radiation, do not remove

covers

CAUTION

Before switching on this product, make sure that the line-voltage selector

switch is set to the voltage of the power supply and the correct fuse is

installed. Assure the supply voltage is in the specied range

CAUTION

Electrostatic discharge (ESD) can damage circuits associated with rear-panel

connectors

.Therefore

,before connecting any cable to arear-panel connector

momentarily short the center and outer conductors of the cable together

void touching the rear-panel connectors without rst touching the frame of

the instrument. Be sure that the instrument is properly earth-grounded to

prevent buildup of static charge

This instrument has been designed and tested in accordance with IEC

Publication 348,

Safety R

equirements for Electronic Measuring Apparatus

and has been supplied in a safe condition. The instruction documentation

contains information and warnings which must be followed by the user to

ensure safe operation and to maintain the instrument in asafe condition.

iii

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FINAL TRIM SIZE : 7.5 in x 9.0 in

The 8504B at a glance

The 8504B precision reectometer is ahigh-resolution interferometer

that measures return loss

.It is optimized for single-mode ber

,but useful

measurements can also be made in multi-mode ber

.The precision

reectometer performs measurements at 1300 nm and 1550 nm wavelengths

Typical applications include:



Measurements of launch optics for lasers and opto-electronic integrated

circuits



Measurements of passive ber-optic devices such as couplers

,attenuators

connectors

,and isolators



High-resolution measurements of lightwave path discontinuities based on a

known refractive index.



Measurement of refractive index of material based on aknown distance

between two discontinuities



High-resolution measurement of path length, expressed as transit time



Measurements of bulk optic devices such as lenses

,AR coatings

,and

crystals

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FINAL TRIM SIZE : 7.5 in x 9.0 in

Using the precision reectometer

,you can display multiple reections from

the device that you are testing. F

or example

,the following gure shows an

LED device with ve reective surfaces

or each surface

,the gure shows

the corresponding response on the precision reectometer's display

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FINAL TRIM SIZE : 7.5 in x 9.0 in

Guided procedures

reduce measurement

time

The precision reectometer provides

guided setup

and

guided calibration

procedures that help you prepare the instrument for measurements

These procedures consist of a series of screens that present step-by-step

instructions

Procedure Task

guided setup

Selects light source and calibrates the instrument for

pigtailed or non-pigtailed devices

guided calibration

Calibrates the instrument.

ou can also manually calibrate the instrument for maximum exibility

Refer to Chapter 2for acomplete explaination of

guided setups

and

guided

calibrations

ou should calibrate the instrument:



After the instrument has warmed up for 1 hour



Before making any measurements

Front-panel adapters

can be changed

The precision reectometer's three front-panel connectors are compatible

with 9/125



mber-optic cables

.All three connectors are adapters that can

be easily changed or removed for cleaning. Simply unscrew each adapter

in acounterclockwise direction. Useful measurements are achievable with

other adapters

,butmeasurement performance may not be optimum. Refer

to \Front-P

anel Fiber-Optic Adapters" in Chapter 5for acomplete listing of

available adapter types.

Softkeys select

instrument features

Many instrument features are available through the use of softkeys

.Softkeys

are the eight keys that are located along the right-hand side of the display

The denitions for these keys are shown on the display next to the key and

change for dierent menus

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FINAL TRIM SIZE : 7.5 in x 9.0 in

Annotation Shown in the Display's \Status Notation" Area

Status

Notations

Description

* Measurement parameters changed: measured data is in doubt until a complete clean sweep has been taken.

vg Sweep-to-sweep averaging is on. The averaging count is shown immediately below this notation.

CError correction (measurement calibration) is on.

D Dispersion correction is on. This notation is available for the 1550 nm source only

ext Waiting for an external trigger at the rear panel.

Hld Hold sweep

OVL Amplitude of reected signal at test port is too large

vii

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FINAL TRIM SIZE : 7.5 in x 9.0 in

front-panel knob Allows continuous adjustments to current values for

various functions such as start value

,scale

,and others

alues changed by the knob are eective immediately

,and

require no units terminator

G/n

erminates numeric keypad entries with 10

multiplier



erminates numeric keypad entries with 10

multiplier

K/m

erminates numeric keypad entries with 10

multiplier

erminates unitless entries such as averaging factors

ENTRY OFF

Disables the keypad, knob

, and step keys until another

function is selected.

viii

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FINAL TRIM SIZE : 7.5 in x 9.0 in

Safety Symbols

The following safety symbols are used throughout this manual. F

amiliarize

yourself with each of the symbols and its meaning before operating this

instrument.

CAUTION

The

caution

sign denotes ahazard to the instrument. It calls attention to a

procedure which, if not correctly performed or adhered to

,could result in

damage to or destruction of the instrument. Do not proceed beyond a

caution

sign until the indicated conditions are fully understood and met.

WARNING

The

warning

sign denotes alife-threatening 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.

Instruction

Manual

The

instruction manual

symbol. The product is marked with this symbol when it is

necessary for the user to refer to the instructions in the manual.

The line-power on symbol.



The line-power o symbol.

CE The CE mark is aregistered trademark of the European Community

.(If accompanied b

year

,it is when the design was proven.)

ISM1-A This is asymbol of an Industrial Scientic and Medical Group 1 Class A product.

CSA The CSA mark is aregistered trademark of the Canadian Standards Association.

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