App-15
IM AQ6370D-01EN
Appendix
App
Appendix 3 Details of Each Analytical Functions
PMD Analysis Function
Measured waveforms are used to analyze PMD values.
Following table shows the details of the parameter for PMD analysis.
Parameter Abbreviation Default Value Setting Range Unit Description
THRESH TH 10.00 0.01 to 50.00 dB Threshold value
Algorithms of the analysis are as follows.
Threshold
Value
• Perform a mode search to obtain mode peaks.
• Of these mode peaks, set the ones whose level (LOG) is equal to or greater than the
line that is below the peak level by the lower limit (THRESH), to the valid mode peaks.
• Set the frequency of the leftmost valid mode peak to F1 (THz).
• Set the frequency of the rightmost valid mode peak to F2 (THz).
• Set the number of mode peaks between F1 and F2 to N.
• Obtain the PMD value from the following equation.
PMD = (N−1) / (F2−F1)
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