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

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
A
Instrument Support Center: [phone]
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
T
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
.S
.
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
.
c
 Copyright Agilent T
echnologies 1992, 1993, 1994, 1995, 2001
All Rights Reserved. Reproduction, adaptation, or translation without prior
written permission is prohibited, except as allowed under the copyright laws
.

FINAL TRIM SIZE : 7.5 in x 9.0 in
W
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
.
W
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
.
W
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
.
A
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

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
.
iv

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
.F
or each surface
,the gure shows
the corresponding response on the precision reectometer's display
.
v

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.
Y
ou can also manually calibrate the instrument for maximum exibility
.
Refer to Chapter 2for acomplete explaination of
guided setups
and
guided
calibrations .
Y
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
.
vi

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.
A
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

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
.
V
alues changed by the knob are eective immediately
,and
require no units terminator
.
4
G/n
5
T
erminates numeric keypad entries with 10
6
9
multiplier
.
4
M/

5
T
erminates numeric keypad entries with 10
6
6
multiplier
.
4
K/m
5
T
erminates numeric keypad entries with 10
6
3
multiplier
.
4
x1
5
T
erminates unitless entries such as averaging factors
.
4
ENTRY OFF
5
Disables the keypad, knob
, and step keys until another
function is selected.
viii

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
L
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.
j
The line-power on symbol.

The line-power o symbol.
CE The CE mark is aregistered trademark of the European Community
.(If accompanied b
ya
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.
ix