HP 86037B, Instruction Manual

Page: 34 / 204

2-16
Operation
The Main Window
TLS Target Power
Use this setting to specify the power level of the tunable laser source. Avoid
entering power levels beyond the capability of the tunable laser source.
Sensitivity
You can select from
Normal
,
High,
and
Highest
settings. Increasing sensitivity
reduces noise but increases the measurement time. The sensitivity setting
configures the IF bandwidth used by the network analyzer. Normal, high, and
highest correspond to 300, 100 and 30 Hz, respectively.
A measurement consisting of twenty wavelength steps might exhibit the mea-
surement times shown in the following table.
Average Factor
Increasing the average factor reduces noise when measuring group delay.
Because this factor controls the number of network analyzer sweeps which
are averaged to at each wavelength point, measurement time increases in pro-
portion to averaging factor. Noise is reduced by the reciprocal of the square
root of the averaging factor.
CD measurement only or CD and Gain measurement
Click these options to include gain measurements during your testing. For
measurements on fibers, the chromatic dispersion measurement is typically
the only measurement of interest. For measurements on filters or systems
containing optical amplifiers you may be interested in the passband of the
device under test because the chromatic dispersion data is meaningful only
within the passband. Selecting the
CD and Gain measurement
option increases the
measurement time.
Table 2-2. Example Measurement Times for 20 Measurement Steps
Sensitivity Measurement Time
Normal 2 minutes, 50 seconds
High 4 minutes, 30 seconds
Highest 10 minutes, 5 seconds