Keysight N4372E Lightwave Component Analyzer User’s Guide
111
Definition of Terms
6
We do not recommend to change the values in the "LCA_TxCorr.csv" file.
Instead we recommend you measure with user calibration for
measurements using an external input.
EO measurements
The wavelength box on the EO tab is an editable, drop down list. This
means you can select one of the default wavelengths, or enter a different
wavelength.
If you select a wavelength other than the default wavelengths, the LCA
checks for the closest default wavelength. The calibration data for this
wavelength is used for the LCA measurements.
Next the LCA checks if the "LCA_RxCorr.csv" file is available.
• If not, no wavelength correction is applied.
• If the file is found, the LCA performs a wavelength correction.
• 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 check box, 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 patch cord 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" check box.
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.
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