Keysight Technologies N4373D, User Manual

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Measurement Concepts
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Keysight
N4373D Lightwave Component Analyzer, User’s Guide
• If the wavelength you entered is not covered by the
"LCA_RxCorr.csv" file, an error message will be shown.
If the selected wavelength is covered by the correction file, the
correction factor is calculated from the values found in the file.
This correction factor is applied to the values from the internal
optical power meter and to the calibration data used for the
LCA measurements.
OE measurements
On the OE tab of the LCA user interface, if you check the
external (laser) input checkbox, you can edit the wavelength.
The principles described for EO measurements are applied to
the transmitter side, using the wavelength correction data in the
file: "LCA_TxCorr.csv".
The LCA expects the power value in the "Power" box to be the
optical power at the Optical Output of the LCA test head.

To set the right power value if you are using an external source:
1 Use a short patchcord to connect the Optical Output to the
Optical Input.
2 Switch to the "Tools" tab of the user interface and set the
receiver wavelength to the external laser wavelength and
check the "External Input" checkbox.
3 Switch on your external source and run the modulator
optimization in the "Default" mode.
4 When the optimization is finished, transfer the optical power
value displayed in the status bar to the "Power" box.
OO measurements
The principles described above for EO and OE measurements
also apply to OO measurements.