Document #: GP-UM-PMD-1000-21
Page 101 of 122
Section 5. Applications:
This section includes brief descriptions of several application examples for a polarization
optimized PMD source.
5.1 PMD Tolerance Testing with Polarization Multiplexed Signals
For polarization multiplexed signals, the measured DOP at the input and output of the
PMDPro are not accurate indicators of the PMD effect on the signal. Therefore, the
functions that depend on them, including the WSOP and PMDC functions, should not be
used with polarization multiplexed signals.
However, the polarization controller’s scrambling function can be used in conjunction
with the basic PMD generation function to perform PMD tolerance testing with
polarization multiplexed signals.
Front Panel Control:
1.
Set the PMD value:
Press the PMDE button to bring up the PMD generation menu.
Select either option 1 (SET DISCRETE PMD) or option 2 (SET CONTINUOUS
PMD).
2.
For discrete mode, use the arrow buttons to select the index number
corresponding to the desired DGD/SOPMD pair. The DGD/SOPMD values will
be updated in real time as the index numbers are changed.
The continuous mode edit screen is shown below:
For both DGD and SOPMD, the number to the left of the “<” symbol is the value
set by the user. The number on the right is the maximum available value. The
maximum available DGD value is determined by whether the PMDPro is a 90 ps
or 180 ps unit. The maximum available SOPMD value is determined by the DGD
value the user selects. As the user changes the requested DGD value, the
maximum available SOPMD value will change accordingly.
DGD:
_ 0.00 < 91.04
SOPMD:
_ _ _ 0.0 < 0.0
SET PMD ID#:
_ _ _1
0.36 ps
0.0 ps2
