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We analyze the phase noise contribution to the photocurrent of the multilevel direct detection receiver based on delay line interferometer (DLI) and balanced photodetector. We show that the phase noise influence in multilevel systems is much stronger compared to that in binary systems as a result of the DLI configuration. The characteristic function of the photocurrent is derived for arbitrary-delay...
We derive a differential Q factor model for DPSK signals detected by delay line demodulators. The parameters involved in the model are related to signal characteristics such as phase noise linewidth, OSNR and power fluctuations, and can therefore be directly monitored from it. Moreover, its validity is tested and confirmed under various phase noise and amplitude fluctuations scenarios. In addition,...
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