EXFO PSO-200 Optical Modulation Analyzer - Manual (Page 32)

Setting Up the Optical Modulation Analyzer
24 PSO-200
Using Special Modulation Modes
Using Special Modulation Modes
In some situations, when the input signal does not represent
phase-encoded data, it can be valuable to bypass some of the signal
processing algorithms to visualize the signal with a better refresh rate or
under different conditions. For example, it may be useful to study just the
intensity before a phase-encoding transmitter is set up correctly, for
debugging purposes.
You can also export the signal data obtained when bypassing some
algorithms to analyze with your own tools (such as MATLAB algorithms).
The Optical Modulation Analyzer application offers the following modes:
Here are the signal processing algorithms (applied or optional) for each
mode (for details, see Signal Processing Algorithms on page 244):
Mode Usage
Free-run General debugging, oscilloscope-like behavior;
useful in initial connections to ensure signal input
Continuous wave CW laser analysis, analyze phase noise
Intensity sampling Fast, useful for a first tuning of the system under test,
shows waveform envelope
Signal Processing Algorithms
(in order)
Free-Run CW
Intensity
Sampling
Polarization demultiplexing Optional Optional Optional
Time reconstruction vector – – Applied
Intermediate frequency recovery – Optional –
Alignment – – –
Other algorithms – Applied –