EXFO FTB -5240S/5240BP Optical Spectrum Analyzer - Manual (Page 311)

Managing Results
OSA 305
Managing EDFA Test Results

Average gain: sum of the gain of all detected channels in the
current measurement, divided by the total number of channels.

Gain slope (tilt): slope of the linear fit on the gain values of the
detected channels.
Swapping EDFA Traces
The Swap Trace feature allows you to swap EDFA input and output traces.
With this feature, the input trace is replaced with the output trace and vice
versa. All results are recalculated.
Note: Swap Trace feature will not be available if there are no traces in the
application.
To swap EDFA traces:
From the Main Menu, press Swap Traces.
All the parameters in the application will be updated according to the
modified traces.