7-10
IM AQ6370D-01EN
7.6 PMD Measurement
Procedure
It is possible to measure the polarization mode dispersion (PMD) from a measured
waveform by using the instrument in combination with a wideband light source and a
polarizer, polarization controller, and an analyzer.
1.
Press ANALYSIS. The soft key menu for analyzing measured waveforms
appears.
2.
Press the ANALYSIS 1 soft key. The analysis function selection menu is
displayed.
3.
Press the PMD soft key. Analysis is performed, and the results are displayed in
the data area.
When changing the analysis parameters
4.
Continuing on from step 3, press the PARAMETER SETTING soft key. The thresh
level setting screen is displayed.
5.
Enter a setting value with the numeric key pad.
6.
Press the CLOSE WINDOW soft key. The thresh level setting screen closes, and
the soft key menu returns to the previous stage.
7.
Press the ANALYSIS EXECUTE soft key. Analysis is performed according to the
changed parameters, and the results are displayed in the data area.
Note
• When PMD measurement is performed, waveform data at or below the threshold level
from the peak are not used in analysis. The threshold level is entered in the threshold level
setting screen.
• The mode-determination threshold level during PMD analysis execution is set using the
MODE DIFF soft key in the PEAK SEARCH menu. The level difference which exceeds the
value set with the MODE DIFF soft key is recognized as a mode.
• See section 6.12 for how to set the mode judgment threshold value.
• For an explanation on the PMD analysis algorithms, see appendix 3, “Details of Analysis
Functions.”
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