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Importance of the Time-Domain Information to Correctly Identify 100G DP-QPSK Transmitter Impairments

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Importance of the Time-Domain Information to Correctly Identify 100G DP-QPSK Transmitter Impairments

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  • Author: François Robitaille, Mathias Westlund, Henrik Sunnerud, Mats Skold
In this paper, we will discuss the importance of complementing the constellation diagram analysis with time-domain information on the transmitted signal in order to quickly and accurately identify impairments. Characterization and testing have been performed using different solutions, from in-house analyzers built around receivers and using heavy signal processing to commercial modulation analyzers. Bit error rate (BER) remains one of the key transmitter-performance evaluation parameters, but additional information is needed to identify impairments. Constellation diagram analysis is one of the new tools used by engineers to characterize 100G DP-QPSK transmitters

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