Optical Modulation Analyzer
64
OMA parameters for polarization de-multiplexing
Frequency Estimation
Since the OMA is based on Heterodyne Detection (Laser on Transmitter is not
exactly
the same laser on
IQScope-RT), there will be a small frequency offset between the lasers. The frequency offset results in the
rotation of the constellation plot. The DSP scans the entire range of frequency offset and finds the value
which gives the minimum error. The DSP automatically corrects this frequency offset. The maximum
frequency offset that the DSP can handle is 10% of the baud rate.
For more information on the frequency offset compensation technique, please refer to:
Y. Wang, E. Serpedin and P.Ciblat. "Non-Data Aided Feedforward Estimation of PSK-Modulated Carrier
Frequency Offset", In IEEE International Conference on Communications 2002, Volume 1, pp.192-196.
Constant
amplitude for all
four symbols
Summary of Contents for IQS25
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Page 3: ...Optical Modulation Analyzer Operator s Manual August 2016 ...
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