EXFO PSO-200 Optical Modulation Analyzer - Manual (Page 85)

Viewing and Analyzing Results
Optical Modulation Analyzer 77
Applying Data Filtering
When you select filtering, the application also activates Average mode (the
averaging time resolution will be set based on the signal’s symbol rate). If
you deactivate average mode, filtering is also deactivated.
Note: Filters are not available in Random input pattern. They require a pattern
(known or unknown) to function properly.
Note: Filters will not work well with OOK modulation.
To activate and configure a filter:
1. From the Settings menu, select Acquisition.
2. Under the Receiver Filter tab, select Apply filtering to data.
3. Select the desired filter algorithm and parameters.

Cut frequency (default = signal’s symbol rate)

Order of the filter (from 1 to 5, default=3)
4. Click Apply to confirm your settings, or OK to also close the window.
Using
Filtering
(Butterworth)