EXFO FTB-5700 Single Ended Dispersion Analyzer for FTB-200 v2 - Manual (Page 75)

Troubleshooting
Single-Ended Dispersion Analyzer 69
Solving Common Problems
PMD-Related Problems
Message Possible cause Solution
Conditions are not optimal
for measuring polarization
mode dispersion. Cannot
perform measurement.
Too much loss in the fiber
under test.
³
Clean the fiber end.
³
Add a reflective
termination at the end
of the fiber.
Unable to ensure a correct
PMD measurement over the
selected wavelength range.
Measurement wavelength
range is to wide.
Try to narrow down the
measurement wavelength
range.
Optical power is not strong
enough to ensure a correct
PMD measurement over the
selected wavelength range.
Too much loss in the fiber
under test.
³
Clean the fiber end.
³
Add a reflective
termination at the end
of the fiber.
³
Reduce the wavelength
range in the Acquisition
tab of the Setup
window, or select
Default as the
wavelength range value.
Unable to ensure a correct
PMD measurement over the
selected wavelength range
because the detector is
saturated.
³
Fiber end is too
reflective.
³
Unsuitable selected
wavelength range for
the measured FUT (out
of the FUT bandwidth).
³
Unsuitable FUT. The
FUT must not cut the
1550 nm wavelength.
³
If you have put a
reflective termination at
the end of the fiber,
remove it.
³
Select a wavelength
range that suits the FUT
and the instrument
range. You can set the
wavelength range in the
Acquisition tab of the
Setup window.