EXFO FTB -5240S/5240BP Optical Spectrum Analyzer User Manual
Page 296
Managing Results
290
FTB-5240S/S-P/BP
Managing DFB Test Results
Worst case SMSR: power difference between the main mode and the
side-mode with the highest power.
Worst case SMSR position: spectral position of the worst SMSR.
Left stopband: spectral position difference between the main mode
and the closest side-mode on the left.
Right stopband: spectral position difference between the main mode
and the closest side-mode on the right.
Central offset: spectral position of the main mode minus the mean of
the spectral positions of the first adjacent left and right side-modes.
Fabry-Perot mode spacing: average estimated spectral spacing
between adjacent Fabry-Perot modes of the DFB.
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