EXFO FTB-5230S Optical Spectrum Analyzer for FTB 200 v2 - Manual (Page 199)

Managing Results
OSA/OCA 193
Managing Drift Test Results
When the acquisition is taken (see Starting a Measurement on page 153 for
details on how to perform a test), the active trace will be displayed in the
tab with information along the following axis values:

X axis: wavelength in nm or frequency in THz.

Y axis: optical power expressed in dBm, as measured in the optical
resolution bandwidth (RBW) of the OSA/OCA. This reference RBW is
shown at the bottom of the graph.
The graph will display peak indicators for all the channels found by the
application with a red vertical line over the peaks to indicate the peak
position.
A blue horizontal bar ( ) will be displayed on the top of a channel if it
does not overlap with another channel. If the channel overlaps with
another channel, the horizontal bar will be yellow (
).