EXFO FTB -5240S/5240BP Optical Spectrum Analyzer - Manual (Page 295)

Managing Results
OSA 289
Managing DFB Test Results
Results Tab
You can view the analysis of the DFB laser source from the Results tab.
To view results:
From the main window, select the Results tab.
The following information related to the DFB measurement is displayed in
the Results table:

Center wavelength/frequency: spectral center-of-mass for the peak.

Peak power (dBm): peak signal power.

Bandwidth 3.00 dB: bandwidth measured by taking the width of a
signal at 50 % linear power of the peak or -3 dB from the peak.

Bandwidth 20.00 dB: bandwidth measured by taking the width of a
signal at 1 % linear power of the peak or -20 dB from the peak.

Left SMSR: Left side-mode suppression ratio. It is the power difference
between the main mode and the most powerful outstanding
side-mode on the left.

Right SMSR: Right side-mode suppression ratio. It is the power
difference between the main mode and the most powerful outstanding
side-mode on the right.