Keysight Technologies N4373D, User Manual

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Making Measurements
90
Keysight
N4373D Lightwave Component Analyzer, User’s Guide
Initializing the OE measurement
1 Press .
2 Select the “OE Measurement” tab.
3 If necessary, select a Differential or Single-Ended Measure
Mode, depending on the type of your DUT.
4 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.
5 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 from the LCA optical output port. (Use an
external power meter, or the LCA power meter).
6 If you are running measurements in an unstable
environment, or need extra accuracy or long term stability,
make sure to select “EverySweep” or “Continuous” for
Modulator Optimization.
Please note, optimizing every sweep adds about 1 second to
each measurement.
“Continuous” modulator bias optimization uses a 10 KHz
pilot tone is applied to the signal. This improves the short
and long term signal stability of the modulator working
point.
The pilot tone will affect measurements with IFBW settings
of the network analyzer >1.5 kHz.

For IFBW settings of the network analyzer >3 kHz we
recommended you do not use “Continuous” modulator bias
optimization, Use "Every Sweep" or "Once" instead.