User's Guide
ersonality
EDF
A
TDE
P
for HP 71450B/1B/2B
HP Part No. 70952-90005
Edition 1
Printed in USA June 1995
1400 Fountaingrove Parkway,
Santa Rosa, CA
95403-1799, USA
Notice.
The information contained in this document is subject to change
without notice. Hewlett-Packard makes no warranty of any kind with regard
ackard
this
of
of
shall
material,
this
to
merchantability
be liable
not
damages
for
connection
in
including
tness
and
contained
errors
with
but
for
the
limited
not
particular
a
herein
furnishing,
the
,
to
purpose
incidental
for
or
performance
implied
Hewlett-P
.
warranties
consequential
or
use
or
,
material.
Restricted
Rights
Government
Rights
the
of
252.227-7013
Commercial
agencies
other
Regulatory
71450B/1B/2B
HP
Legend.
subject
is
T
in
for
Computer
to
echnical
agencies
DOD
Software
.
Information.
Optical
duplication,
,
Use
restrictions
and Computer
Data
and
,
Restricted
specications
The
Spectrum
disclosure
or
forth
set
as
Software
subparagraphs
Rights
characteristics
and
eference
Analyzers
R
in
clause
by
subparagraph
at
and
FAR
at
(c)
clause
(c) (1)
contains
(1)
(c)
ARS
DF
of
(2)
52.227-19
chapter
regulatory
(ii)
the
of
for
the
.
.S
U
the
information.
c
Copyright Hewlett-P
ackard Company 1995
All Rights Reserved. Reproduction, adaptation, or translation without prior
written permission is prohibited, except as allowed under the copyright laws.
EDFA Analysis with the EDFA TDE Per-
sonality
The EDFA Time Domain Extinction (TDE) Personality characterizes the
gain and noise gure of erbium-doped ber ampliers. The measurement
technique used takes advantage of the fact that, immediately after turning o
the input signal, an EDFA's amplied spontaneous emissions (ASE) has a slow
recovery to the undriven state.
The TDE personality performs the following measurements on erbium-doped
ber ampliers:
Source
Gain
Noise
Input
EDF
EDF
Integrated
The
71450B/1B
71450A/1A
kit
The
Lasers
triggers
wavelength.
versus wavelength.
gure versus
and output
Aand
A
input signal-to-noise
versus
noise
amplied
personality
is
Option
optical
installed.
personality
TDE
(Option
003
measurements
wavelength.
power versus
wavelength.
spontaneous
optical
intended
is
with
spectrum
analyzers
included
052
spectrum
recommended).
optical
the
on
wavelength.
versus
ratios
emission
71452B
HP
the
analyzers
that
used
be
to
tunable
The
spectrum
wavelength.
(ASE)
and
.
had
have
HP
with
laser's
analyzer
wavelength.
over
available
is
also
can
It
HP
the
8168A/B/C
modulation
.
for
used
be
70953A
Tunable
output
If not already installed, install the program as described in Chapter 1.
Once installed, you can start the program by pressing
NNNNNNNNNNNNNNNNNNNNNNN
EDFA_TD
softkey.
4
USER
5
and then the
HP
on HP
upgrade
iii
On-line help is available
A help menu is always available by pressing the
this menu is displayed, pressing any other softkey displays information about
that softkey. The information includes an equivalent programming command
if available.To remove the help menu, simply press
NNNNNNNNNNN
Off
is underlined.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
HELP On Off
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
HELP On Off
softkey. Once
so that
iv
Help menu.
Ensuring the greatest
accuracy
To ensure the greatest possible accuracy, observe the following:
Maintain a resolution bandwidth0.5 nm for best amplitude accuracy.
Perform a user calibration of the optical spectrum analyzer as described in
Chapter 2.
Optical isolator reduces reections.
Inserting isolators at the input and output of the erbium-doped
ber amplier reduces the eect of external reections on amplier
performance.
Clean connections are required for best accuracy. When connecting
ber-optic
1. Clean
Optical
the
do
,
cables
the connectors
Spectrum
Analyzers User's
following
as described
steps:
in Chapter
Guide
.
Dry
HP
the
of
1
connections
71450B/1B/2B
are
recommended.
outside
the
touch
not
does
end
connectors so
Align
2.
mating
the
After
3.
to
hand
to
Refer
Overtightening
nonrepeatable
and
connector
ferrule
it
keep
manufacturer's
the
that the
not rub
Do
.
properly
is
straight
undertightening
or
connections
ber
the
seated
nger-tighten
and
data
.
end
ber
inside
for
sheet
connectors
against
connector
the
with
it
torque
other
any
use
,
other
the
recommendations
in
result
can
surfaces
one
hand.
misalignment
of
the
.
.
Fusion
.
.
measurements
A
EDF
in
splices
reduce
Fusion
splices
largest
The
repeatability
is
reduce
source
of
measurement
measurement
of
ber-optic
uncertainty
uncertainty
connections
connector uncertainties of60.25 dB to a60.05 dB splice uncertainty.
typical
v
Control program using
softkeys or
programming
commands
Conventions
ey
K
The EDFA TDE personality can be controlled either via softkey menus or
remote programming commands. Softkeys are the seven buttons located on
each side of the screen. The functions of softkeys change according to the
menus displayed on the screen. Generally, left-side softkeys access major
menus. Refer to Chapter 3 for a denition of the programming commands.
Use the following three front-panel keys on the HP 70004A display to select
the available softkey menus:
Press
4
5
to view EDFA TDE personality menus. The personality must
USER
rst be installed as described in Chapter 1.
Press
4
5
to view optical spectrum analyzer menus.
.
in
menus
this
guide:
view
to
5
Y
conventions
HP
70004A
used
are
display
Press
following key
The
MENU
4
DISPLA
4
ront-panel
F
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
N
Softkey
Screen
N
N
N
key
N
N
N
N
Text
ext
T
5
the
ext
T
located
are
analyzer
ext
T
instrument's
shown
spectrum
shown
next
annotation
the
display
printed
this
like
analyzer
this
like
the
to
.)
this
in
screen.
represents
.
represents
softkey
the
on
typeface
labels
right
indicates
key
a
softkey
a
and
,
left
or
physically
(The
.
softkey
the
the
of
side
displayed
text
located on
softkeys
labels
spectrum
on
are
the
vi
Hewlett-Packard Software Product License
Agreement
Important
Please carefully read this License Agreement before opening the media envelope or operating the
equipment. Rights in the software are oered only on the condition that the Customer agrees to
all terms and conditions of the License Agreement. Opening the media envelope or operating the
equipment indicates your acceptance of these terms and conditions. If you do not agree to the License
Agreement, you may return the unopened package for a full refund.
Use
Copies
Adaptations
and
to
the
following:
the
.
the
for
for
a
archival
return
In
Customer
Customer
Customer
Customer may
when
payment
license
may
may
copying
the
of
software
the
in
software
the
use
reverse
not
make copies
adaptation
or
,
purposes
applicable
assemble
adaptations
or
or
,
on
is
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or
essential
an
fee
Hewlett-P
,
terminated,
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decompile
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of
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ackard
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analyzer
software
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grants
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Customer has no other rights to copy unless they acquire an appropriate
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is
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ransfer
T
Software
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Customer agrees that they do not have any title or ownership of the
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Customer acknowledges and agrees that the software is copyrighted and
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ackard.
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U
software
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U
a
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distribute
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and
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required
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telecommunication without the prior written consent of Hewlett-Packard.
Hewlett-Packard may terminate this software license for failure to comply
with any of these terms provided Hewlett-Packard has requested Customer
to cure the failure and Customer has failed to do so within thirty (30) days
.
of such
notice
are
or
shall
viii
Updates and Upgrades
Customer agrees that the software does not include future updates
and upgrades which may be available for HP under a separate support
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Export
Customer agrees not to export or re-export the software or any copy or
adaptation in violation of the U.S. Export Administration regulations or
other applicable regulations.
ix
Limited Warranty
Software
Media
Notice of Warranty
Claims
Hewlett-Packard warrants for a period of one (1) year from the date of
purchase that the software product will execute its programming instructions
when properly installed on the spectrum analyzer instrument indicated
on this package. Hewlett-Packard does not warrant that the operation of
the software will be uninterrupted or error free. In the event that this
software product fails to execute its programming instructions during the
be
the
of
use
any
remedy
amount
price
card
warranty
period,
(\media")
replace
be
a
time
free
period
be
to
remedy
and
ackard
from
prove
to
ackard
Customer's
,
unable
alternate
product
Hewlett-P
to
for
media
shall
Hewlett-P
of
upon return
Hewlett-P
to
all
defects
one
of
be
to
return
the
of
Customer's
ackard for
the media
be
shall
.
copies
warrants
in
year
(1)
defective
media
the
unable
be
alternate
product
remedy
within a
refund
a
media upon
the
materials
the
from
during
Hewlett-P
to
replace
to
remedy
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and
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to
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shall
replacement. Should
reasonable amount
purchase
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of
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and
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warranty
the
ackard
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the
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a
measurement
the
Hewlett-Packard
Customer's
of time
upon
product
under
In the
.
,
return
recorded
is
normal
event
Customer's
Should
reasonable
a
purchase
the
of
Customer must notify Hewlett-Packard in writing of any warranty claim not
later than thirty (30) days after the expiration of the warranty period.
Limitation of Warranty
Hewlett-Packard makes no other express warranty, whether written or oral,
with respect to this product. Any implied warranty of merchantability or
have
.
other
tness
This
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is
warranty
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specic
legal
rights
year
(1)
one
the
rights which vary from state to state
duration
of
and Customer
,
, or province
written warranty
this
may
to province
also
.
x
Exclusive Remedies
The remedies provided above are Customer's sole and exclusive remedies.
In no event shall Hewlett-Packard be liable for any direct, indirect, special,
incidental, or consequential damages (including lost prot) whether based on
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Warranty Service
Warranty service may be obtained from the nearest Hewlett-Packard sales
oce or other location indicated in the owner's manual or service booklet.
xi
Contents
1. Installing the Personality
To Install From the Memory Card . . . . . . . . . . .
To Install From a 3.5-inchDiskette Drive . . . . . . . .
If a Memory Error is Displayed . . . . . . . . . . . .
2. Performing Measurements
Calibrating the Optical Spectrum Analyzer . . . . . . .
optical
T
a
y noise
the
an
est
a
a
an
the
the
HP
.
.
single
ulti
m
output
Program
alues
v
amplitude
eak
p
noise
ASE
calibrate
o
T
calibrate
o
T
Running
erform
p
o
T
erform
p
o
T
erform
p
o
T
Conguring
displa
o
T
hange the
c
o
T
hange the
c
o
T
hange the
c
o
T
hange
c
o
T
ectrum
sp
71450A/1A
.
.
.
.
.
elength
v
a
w
elength
v
a
w
.
test
.
. .
.
.
.
scale
excursion
bandwidth
tegration
in
.
.
.
test
test
.
.
.
.
.
.
.
alue
v
.
windo
analyzer
.
.
.
.
.
.
.
.
.
.
.
.
.
.
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.
.
.
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.
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.
.
.
.
w
.
. .
.
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.
. .
. .
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.
. .
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.
.
.
.
.
.
1-4
1-6
1-8
2-4
2-5
.
2-14
.
2-24
2-26
.
2-32
2-40
.
2-43
.
2-45
.
2-46
.
2-46
.
2-47
.
2-47
.
Programming
3.
. .
.
.
.
.
.
.
.
.
.
.
.
.
.
duction
tro
In
Commands
.
F
y
b
unctional
Group
.
.
.
.
.
.
Softkeys versus Commands . . . . . . . . . . . . . .
Commands in Alphab etical Order . . . . . . . . . . .
4. Reference
MenuMap . . . . . . . . . . . . . . . . . . . . .
.
.
.
.
.
.
.
.
. .
.
.
.
Messages
Error
Measuremen
EDFA Gain
EDFA Noise
EDFA S/N
Input S/N
Input Pwr
Integrt ASE
.
Calculations .
t
.
.
.
.
.
.
.
.
......................
..... ....... ...... ...
..... ....... ...... ...
.
.... ........ ...... .
...
....
..................
....................
. .
. .
.
.
.
.
3-4
3-7
.
3-10
3-12
4-3
. .
.
.
.
. .
.
.
4-4
4-5
.
4-5
4-6
4-7
4-8
4-9
4-10
Contents-1
Characteristic Measurement Uncertainty
Integrt BW
Noise BW
Noise Fig
Output Pwr
Wavelength
Characteristic Measurement Uncertainty . . . . . . . .
Index
...... ........ ...... . 4-11
...................... 4-11
...................... 4-12
...... ........ ...... . 4-12
...... ........ ...... . 4-13
4-14
Contents-2
1
Installing
the
ersonality
P
you
Do
70004A
have
display?
an
HP
Installing the Personality
If you have an HP 71452B optical spectrum analyzer, the EDFATDE
personality has already been installed at the factory. Use the procedures in
this chapter to install the personality into HP 71450A/0B/1A/1B instruments
and to reinstall the program if it is erased from memory. Copies of the
program are included in the following forms:
Memory card.
3.5-inch diskette.
YES
Install
from
NO
Install
Refer
(HP-LIF format)
personality
the
memory
the
personality
the
o install
\T
to
card"
from
the
from
this
in
directly
3.5-inch
a
memory
chapter
from
dikette
the
.
an
card.
external
drive"
Refer
in
\T
to
HP-IB
this
install
o
disk
chapter
drive
.
.
Installing on HP
71450A/1A optical
spectrum
analyzers
installed,
program
the
ower
is
internal
the
erased
program
from
battery
is
memory
return
,
stored
battery-powered memory
in
With normal
.
optical
the
use,
spectrum
internal
the
analyzer
.If
to
the
battery
Hewlett
a
internal
lasts
for
ackard
P
battery
several
service center
Battery P
Once
the
replace
The EDFATDEPersonality can be installed in HP 71450A/1A optical
spectrum analyzers
if the HP 70953A upgrade kit is installed.
1-2
loses
power
years.
,
o
T
.
Installing the Personality
Chapter Contents
To install from the memory card
::::::::::::::::::::::::::::::::
To install from a 3.5-inch diskette drive
If a memory error is displayed
:::::: :::::::: ::::::: ::::::::: ::::
:::::::::::::::::::::::::
1-4
1-6
1-8
1-3
To Install From the Memory Card
1. Press
4
5
. If the softkey
USER
EDFA_TD
appears, the personality is
already installed. Continue with Chapter 2 to learn how to perform
measurements.
2. Locate the memory card containing the program.
3. Locate the arrow printed on one end of the card.
4. Insert the card into the HP 70004A display's front-panel card slot. Match
NNNNNNNNNNNNNNNNNNNNNNN
the
card's
arrow
with
the
arrow
printed
above
the card
slot.
5.
6.
7.
8.
1-4
Press
Press
Press
Press
4
N
4
NNNNNNNNN
and
5
Y
DISPLA
N
N
N
N
NN
N
N
N
N
msi
MENU
then
and
5
and then the left-side
NNNNNNNNNNNNNNNNNNNNNNNNN
MORE 1 of 3
the
then
N
N
N
N
NN
N
N
N
N
N
MEMORY
N
and then
left-side
N
NN
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
CARD
NNNNNNNNN
catalog & MSI
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Storage
Mass
N
N
.
N
NNNNNNNNNNNNN
Misc
softkey.
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNN
softkey
.
.
Installing the Personality
To Install From the Memory Card
9.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Press
HP-MSIB CARD
If
2053 Storage device error
to display all les contained on the memory card.
is displayed, either the card is missing
or the card's HP-MSIB address is listed incorrectly. The HP-MSIB
address for the card is the same address as the display's HP-IB address
and is normally set to 4. If the address is not correct, enter the correct
address using the numeric keypad.
10.
Press the
11. Use the numeric keypad to enter the
this means pressing
The
is
the
If
12.
not
program.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
front-panel
being
error
enough
LOAD FILE
LED
copied
into
message
memory
free
\If
to
Refer
softkey.
415
and then
next
the
2011
memory
a
to
4
USER
Memory
the
in
NNNNNNNNNNNNNNNNN
ENTER
card
the
menu.
5
overflow
optical
error
EDFA_TD
.)
slot
spectrum
displayed"
is
le number. (Normally,
lights indicating
displayed,
is
analyzer
in
there is
to
this
that the
load
chapter
le
the
.
1-5
To Install From a 3.5-inch Diskette Drive
When copying programs directly from an external diskette drive, the drive
must be a 3.5 inch, CS80-compatible drive, such as an HP 9122. The diskette
containing the EDFA TD advanced-measurement program uses the LIF
format.
NNNNNNNNNNNNNNNNNNNNNNN
1. Press
4
5
. If the softkey
USER
EDFA_TD
appears, the EDFA TDE personality
is already installed. Continue with Chapter 2 to learn how to perform
measurements.
the
to
N
N
N
N
N
the
N
N
use
drive
the
N
N
N
N
N
N
N
N
N
N
DISK
left-side
then
the
module
program
the
left-side
N
N
N
N
N
N
N
N
NN
.
N
N
N
N
N
NN
N
N
catalog
numeric
.
NN
NN
N
Mass
Ignore
N
N
N
N
N
N
N
N
N
Misc
N
N
N
N
N
N
N
N
N
N
Connect
2.
the
Insert
3.
4.
Press
5.
Press
to
Press
6.
7.
Press
8.
Press
drive's
optical
the
4
DISPLA
N
N
N
N
msi
read
4
MENU
NN
N
N
MORE
N
N
N
N
HPIB
address
3.5-inch
a
spectrum
diskette
Y
N
N
N
N
N
N
N
and
device.
5
N
N
N
N
N
N
N
N
N
N
N
N
N
N
1
N
N
N
N
N
N
N
N
N
N
N
N
N
N
DISK
5
and
N
N
N
N
N
of
N
NN
NN
.
and
then
N
N
N
N
N
N
diskette
analyzer
containing
then
N
N
HPIB
then
N
N
N
N
N
N
NN
N
and
3
N
N
N
and
,
New addresses are entered in the following form:
where:
A
is a digit from 0 to 7, representing the drive's HP-IB address.
U
is a digit from 0 to 9, representing the unit number. The unit
refers
and
1
or
typically
number
The
V
is
default
value
is a digit from 0 to 9,
0
0.
is
representing the volume number
numbers are used for hard disk drives
volume number should be 0. The default value is 0.
MMS
Use
N
N
N
N
N
N
N
any
N
N
N
N
N
softkey
NN
N
N
N
N
N
N
N
N
&
keypad
to
.So
mainframe that
cable.
HP-IB
an
diskette
the
into
N
N
N
N
N
N
N
N
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
Storage
message
softkey
such
.
N
N
N
N
N
N
N
N
N
N
N
N
.
MSI
enter
to
A.UV
individual disk
an
for reading diskettes
,
drive
the
contains
.
.
Unable
as
diskette
drive
.Volume
slot.
, the
1-6
Installing the Personality
To Install From a 3.5-inch Diskette Drive
For example, entering
3.00
indicates an address of 3, a unit number of
0 and a volume number of 0. This accesses a diskette in the left drive
of an external diskette drive at HP-IB address 3.
NNNNNNNNNNNNNNNNN
9. Press the
10.
Press the
11. Use the numeric keypad to enter the
this means pressing
12. If the error message
not
program.
enough
ENTER
softkey.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
LOAD FILE
415
memory
free
\If
to
Refer
softkey.
EDFA_TD
and then
NNNNNNNNNNNNNNNNN
ENTER
.)
2011 Memory overflow
in
memory
a
the
optical
error
spectrum
displayed"
is
le number. (Normally,
is displayed, there is
analyzer
this chapter
in
to
load
the
.
1-7
If a Memory Error is Displayed
1. Press
2.
3.
4
5
MENU
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Press
MORE 1 of 3
and then the left-side
and then
Misc
softkey.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
catalog & MSI
.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Press
INTRNL MEMORY
Notice the
MEM
TOTAL MEM
(available memory) by deleting existing les to free additional
. The following gure shows a typical display.
and
AVAIL MEM
listings.You must increase
AVAIL
memory.Or, if you have an HP 71450A/1A optical spectrum analyer,you
approximately
is
NNNNNNNNNNNNNN
need
may
131000
qualied
to
bytes
service
install
memory
of
personnel.
additional
1
a
,
memory;
memory
MB
Order
the
TOTAL
if
assembly
70953A
HP
MEM
can
upgrade
installed
be
kit.
by
1-8
spectrum analyzer memory conguration.
Optical
2
erforming
P
Measurements
Performing Measurements
In this chapter, you'll learn how to characterize erbium-doped ber ampliers.
The EDFA TDE personality provides three separate testing modes:
SingleTest measures EDFA noise gure and gain at a single wavelength.
MultiTest measures EDFA noise gure and gain over a wavelength
range using a tunable laser source.
output
and
,
Output
est
T
measures
output
signal,
signal-to-noise ratio
in situations
Use Output
required.
is
Test
output
at the
noise
output of
when total
an EDF
system
in
or
A
performance
system.
a
menu.
Main
the
from
tests
the
Select
To get the most from your measurements
, be sure to read \Conguring the
Program" in this chapter; it describes customizing the measurements via the
Setup menu.
2-2
Chapter Contents
Performing Measurements
To ensure accurate measurements . . .
During calibrations and measurements, lightwave instrumentation and test setups are sensitive to
vibration and movement. To ensure accurate measurements avoid bumping, moving, or otherwise
jarring the instrument, test equipment, and supporting structure.
2-4
:
:
::
::
::
:
:
:
:
:
:
:
:
:
:
:
:
:
Calibrating
calibrate the
To
calibrate
o
T
perform
o
T
perform
o
T
perform
o
T
display
o
T
change
o
T
change
o
T
change
o
T
change
o
T
a
Running
Conguring
T
the
est
the
Optical
optical
HP 71450A/1A
an
::
::
:
:
single
a
multi
a
output
an
Program
values
noise
amplitude
the
peak
the
noise
the
ASE
the
Spectrum
spectrum
:
:
:
:
:
:
:
:
:
:
wavelength
wavelength
:
:
test
:
:
:
:
:
:
:
:
:
:
:
:
scale
excursion
bandwidth
integration
Analyzer
analyzer
..
..
:
:
:
:
:
test
test
:
:
:
::
:
:
:
:
:
:
:
:
:
:
:
:
:
value
:
:
window
:
2-5
..
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.2-14
..
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
..
2-24
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
::
::
:
:
:
:
:
:
2-26
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
::
:
:
2-32
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
::
:
2-40
:
:
:
:
:
::
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
2-43
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
::
:
:
2-45
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
::
:
2-46
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
::
:
:
:
:
:
:
:
2-46
:
:
:
:
:
:
:
:
:
:
:
:
:
::
:
:
:
:
:
:
:
:
:
2-47
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
::
::
:
:
:
:
:
:
:
:
2-47
:
:
:
:
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:
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::
::
:
:
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:
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:
:
:
2-3
Guard
due
against
polarization
to
changes
Calibrating the Optical Spectrum Analyzer
Performing a user calibration on the optical spectrum analyzer
ensures maximum wavelength and amplitude accuracy for your EDFA
measurements. User calibrations require a stable (amplitude and wavelength)
single-frequency laser within the 600 to 1700 nm range.You can access the
Calibration menu from the optical spectrum analyzer's
4
5
MENU
and then
NNNNNNNNNNNNNNNNN
Amptd
.)
NNNNNNNNNNNNNNNNN
Amptd
menu. (Press
The optical spectrum analyzer's maximum calibration adjustment is about 2
Illegal
2023,
in wavelength.
nm
signal
Cal
Because
the
calibration
polarization
source's
light
ber-optic
optical
the
polarization,
If a
displayed.
is
optical spectrum
performed
optical
on
output
the
is
measured
be
power
power
disconnected
analyzer
should
cable
spectrum
larger adjustment
analyzer is
persons
by
measurements
measured
rst
is
the
from
Because
.
the
of
value
is attempted,
slightly
knowledgeable
During
.
with
power
moving
output
meter
ber-optic
power
error
polarization
calibration,
the
power
a
and
cables
vary
may
sensitive
eects
the
on
Then, the
.
meter
connected
changes
.
,
the
to
this
of
wavelength
a
Use
or optimum
F
within
results, perform
amplier's
the
the
calibration
range
a
at
wavelength
that
is
within
the
range
the
of
you are testing.
During a calibration, the optical spectrum analyzer defaults expect a signal within the following limits:
Power .........................................05dBm65dB
Wavelength ........................................130062nm
calibration
your
amplitude
enter the
must
ou
Y
wavelength
and
of
source
from these
dierent
is
it
if
values.
2-4
amplier
Performing Measurements
Calibrating the Optical Spectrum Analyzer
To calibrate the optical spectrum analyzer
Ensuring amplitude accuracy
During this procedure, avoid moving the ber-optic cables whenever possible. Moving ber-optic cables
changes the polarization of the light which aects power measurements.
source
Measure
the
wavelength
Measure the average
power
following
The
11896A
HP
The
optical
spectrum
71450A/1A"
Measure
1.
wavelength
The
the
the
procedure
the
is
analyzers
chapter
this
in
wavelength
the
meter
must
laser
optical
spectrum
wavelength
requires
suggested
perform
.
Enter
.
a
have
analyzer's
air
in
as
power
a
polarization
the
precision
a
of
wavelength
the
wavelength
monochromator
.
meter
controller
listed
steps
single-mode
in
between
and
in
the
600
polarization
a
or
F
.
calibrate
o
\T
laser
provided
space
1700
to
air
is
HP
lled,
controller
71450A/1A
an
a
using
nm.
measure
HP
below
Because
wavelength: nm
2. Connect the laser, polarization controller, and power meter as shown in
the following gure.
.
.
2-5
Performing Measurements
Calibrating the Optical Spectrum Analyzer
accurate
For
not
Do
procedure
Adjust
3.
on
measurements
disconnect
.
cable
Maintaining
the polarization
the power
or
1
connection
this
meter.
from
2
cable
ensures
controller to
Record the
the laser
the
power
polarization
or
greatest
achieve
level
controller
measurement
maximum
the
the
on
during
.
accuracy
following
calibration
the
power
line:
reading
maximum power: dBm
4. Adjust the polarization controller to achieve a minimum power reading on
the power meter. Record the power level on the following line:
minimum power: dBm
and
3
steps
Calculate
5.
the
using
4
averag e power
average
the
following
minimum power
=
the two
of
equation.
power
Record
+
readings
the result
maximum power
2
average
recorded
below:
power:
in
dBm
2-6
Performing Measurements
Calibrating the Optical Spectrum Analyzer
6. In the test setup, replace the power meter with the optical spectrum
analyzer as shown in the following gure. Be sure to use two cables and
an adapter to connect the optical spectrum analyzer to the polarization
controller.
7. Turn the laser on.
For accurate measurements
Do not disconnect cable 3 from the optical spectrum analyzer during or after the calibration procedure.
Maintaining this connection ensures the greatest measurement accuracy, since your optical spectrum
analyzer
replaced
be calibrated
will
aber
with
splice
splice measurements,
fusion
or
F
3.
cable
of
end
free
the
at
.
the
is
adapter
2-7
Performing Measurements
Calibrating the Optical Spectrum Analyzer
Determine correction
factor for source
spontaneous emission
8. Press
9. Press
10. Press
4
INSTR PRESET
4
AUTO MEAS
4
AUTO ALIGN
5
.
5
to display the laser's response.
5
to align the optical spectrum analyzer.
11. If the instrument you are calibrating has the Option 051 personality,
perform the following steps:
N
.
NNNNNNNNNNNNN
EDFA
to start the EDFA test personality.
a.
b.
Press
4
USER
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Press
Output Test
5
and then
c. Locate the peak of the spontaneous emission. Adjust the wavelength
spontaneous
of
dB
10
peak,
this
of
side
either
on
that,
so
span
.
visible
the
is
change
to
4
SP
AN
5
key along
with
front-panel
the
knob
emmision
Use
span.
the
Span adjusted for proper
d.
Press
2-8
NNNNNNNNNNNNNNNNN
Setup
spontaneous emmission levels.
and then
NNNNNNNNNNNNNNNNNNNN
INTEGRT START
NNNNNNNNNNNNNNNNNNNNNNNNN
NN
.
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