EXFO FTB-5500B PMD Analyzer - Manual (Page 97)

Polarization Mode Dispersion Analyzer 89
9 Troubleshooting
Solving Common Problems
Before calling EXFO’s technical support, you may want to consider the
following solutions to problems that could occur.
Message Possible cause Solution
Detected signal is out of
user selected band.
No signal detected in the
selected band. However,
another signal has been
detected outside the
specified band. The
application will try to take a
measurement using the
specified band.
³
Ensure the source is on.
³
Ensure the source
wavelength matches the
selected band for the
Polarization Mode
Dispersion Analyzer.
Strong signal detected out of
the selected band.
Measurement may be
erroneous.
Signal detected in the
selected band. However,
another strong signal has
been detected elsewhere
on the whole measurement
band. Measurement
accuracy can be affected.
Turn off the sources emitting
at wavelengths that do not
match the selected band for
the Polarization Mode
Dispersion Analyzer.
Narrowband optical source
detected. Measurement
may be erroneous.
The source being used has a
very narrow bandwidth that
prevents an accurate PMD
measurement.
³
Use a LED or SLED
source.
³
Ensure no narrow
source is used for the
selected band.
The frequency range of
signal is out of measuring
range. The acquisition
operation was canceled.
The frequency range of
signal is out of measuring
range (160 THz to 250 THz).
³
Use a source with a
wavelength matching
the Polarization Mode
Dispersion Analyzer
bands.
³
Ensure that the source
power is sufficient.