Keysight N4372E Lightwave Component Analyzer User’s Guide
71
Making Measurements
4
Initializing the OO measurement
1 Click .
2 Select the “OO Measurement” tab.
3 Select the wavelength at which you are testing.
If you want to use external laser sources, select the optional External
Input, and enter the wavelength of the external source.
4 Set the power of the laser to be applied to the test circuit.
If you are using the external source input, enter the value for the power
emitted by the LCA optical output port. (Use an external power meter,
or the LCA power meter to measure the optical power).
5 If you are running measurements in an unstable environment, or need
extra accuracy or long term stability, make sure to select “EverySweep”
or “Continuous” (recommended) for Modulator Optimization.
Please note, optimizing every sweep adds about 1 second to each
measurement.
"Continuous" modulator bias optimization superimposes a 10 kHz pilot
tone onto the signal. This improves the short and long term signal
stability of the modulator operating point.
The pilot tone will affect measurements with IF bandwidth settings of
the network analyzer > 5 kHz.
For IF bandwidth settings of the network analyzer > 10 kHz we
recommend setting modulator bias optimization to "Every Sweep" or
"Once". Not using “Continuous” modulator bias optimization affects
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