EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 285)

Optical Spectrum Analyzer 277
11 Managing Results
Your Optical Spectrum Analyzer allows you to manage results in the WDM,
Drift, DFB, Spectral Transmittance and EDFA modes. You can view the trace
details, channel results and global results for all measured channels. The
application also allows you to edit setup parameters and re-analyze the
results for WDM, EDFA and Spectral Transmittance modes.
You can use zoom options on the trace, configure markers to view the
power values for specific wavelengths, and view trace information.
You can also manage trace files (save, open) and generate reports for all
test modes.
Note: When a power result is flagged using a star character ( * ), it means the
detector is saturated. When the optical power on the detector is too high,
the detector gets saturated and the returned value is probably incorrect.
Note: When an OSNR or a noise result is flagged using a question mark character
( ? ), it means the polarization discrimination is insufficient to make a valid
OSNR calculation. This indication can only be produced when making an
In-Band measurement. This indication can arise in the following situations:
³
In-Band averaging was made using a very few scans (1 or 2 for
example). Usually produced when the operator presses the Stop
button before the end of the In-Band acquisition.
³
The data in the measured channel is subjected to fast polarization
scrambling.
³
The channel is a POLMUX channel.
³
One channel might have a misfit with the current state of the
polarization scrambler inside the OSA module. Can be corrected by
moving the fiber at the entrance of the module.
³
The polarization scrambler inside the OSA module could be defective.
If you suspect this option please contact EXFO technical support for a
more complete diagnosis.