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The design of a polarization de-multiplexer and a polarization mode dispersion compensator (PMDC) for direct-detect polarization division multiplexed (PDM) return-to-zero differential quadrature phase shift keying (RZ-DQPSK) systems are studied in detail. The impact of polarization dependent loss is studied in polarization de-multiplexers with different error detection configurations for both bit-aligned...
A PMDC working in the cancellation mode is proposed for Pol-Mux RZ-DPSK/ DQPSK systems. It has separate control loops for PMDC and Pol-Demux. It showed 18 ps of DGD tolerance in a 112 Gb/s bit-aligned Pol-Mux RZ-DQPSK system.
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