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EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) User Manual

Page 351

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Managing Results

Optical Spectrum Analyzer

343

Managing DFB Test Results

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Right stopband: indicates the spectral position difference between
the main mode and the closest side-mode on the right.

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Two-sided stopband: indicates the spectral position difference
between closest left and right side-modes adjacent to the main mode.

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Central offset: indicates the spectral position of the main mode minus
the mean of the spectral positions of the first adjacent left and right
side-modes.

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Fabry-Perot mode spacing: indicates the average estimated spectral
spacing between adjacent Fabry-Perot modes of the DFB.