Abstract
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 and bit-interleaved PDM
systems. The level of the clock frequency of the combined pulse train of the
two polarizations is proposed as the error signal for the PMDC. It enables
the PMDC to work in the cancellation mode. Two separate control loops are
proposed for the polarization de-multiplexer and the PMDC to allow them to
work independently. The DGD tolerances for the one-stage and two-stage PMDC
are measured and discussed. Finally the glitch problem in the polarization
tuning algorithm is studied. An advanced dithering algorithm and the
corresponding architecture of the polarization controller are proposed to
solve the glitch problem.
© 2010 IEEE
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