EXFO FTB-5600 Distributed PMD Analyzer - Manual (Page 73)

Managing Results
Distributed PMD Analyzer 67
Section Status
High
Depolarization
(HiDep)
The first or last point in
the section shows a
high intrinsic
polarization level that
causes the
measurement to be
imprecise.
The concerned section
shows a strong level of
intrinsic that causes
the measurement to
be imprecise.
The beating length, the
local variations that
have to be measured,
is a lot shorter than the
size of the pulse.
Therefore the
polarization fluctuation
measured by the unit
vanished through the
pulses spatial
averaging and is not
picked up.
To improve the
situation, you can try
to move the section
cursors outside the
region where the
results are invalid,
increase the spatial
smoothing filter value
or taking a
measurement with a
shorter pulse.
Status In PMD column In Status column Suggestion