200-Gb/s, 430-km PDM-RZ-DQPSK (4 bit/symbol) transmission with 10 krad/s endless polarization tracking

We report agile endless optical polarization demultiplex, free of polarization channel jumps, over a 475 Mrad long Poincare sphere trajectory at 10 krad/s speed, in a 50-Gsymbol/s, 4-bit/symbol realtime data transmission over 5 fiber spans.

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