2-5
Making Measurements
Performing Stimulus-Response Measurements
To characterize a passive device
1
Turn on the optical spectrum analyzer and the Agilent 83438A, and allow them
to warm up for 1 hour.
2
Use a fiber optic cable to connect the Agilent 83438A’s output to the input of
the optical spectrum analyzer.
3
On the optical spectrum analyzer, press
INSTR PRESET
,
AUTO MEAS
,
and then
AUTO ALIGN
.
4
On the optical spectrum analyzer, use the
START
and
STOP
keys to set the proper
wavelength range.
5
Press
REF LEVEL
, and set the reference level to –10 dBm.
6
Press
SENS,
and set the sensitivity to –70 dBm. You can increase the sensitivity
beyond this value if needed.
7
If you are measuring a deep-notch filter, more sensitivity may be required.
Perform the following steps:
a
Press
Amptd
,
MORE
, and then
CHOP On
so that
On
is underlined.
b
Press
BW,Swp
,
SWPTIME AutoMan
, and set the sweep time to 50 seconds.
These steps cause the optical spectrum analyzer to compensate for the
effect of stray light inside the analyzer’s monochromator.
8
Press
State
,
instr modes
, and then
STM/RESP
.
9
Press
STORE THRU->B,
and then
NORM On Off
to normalize the response.
