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We present real-time transmission of 50-Gbaud polarization-division-multiplexed (PDM) return-to-zero differential quadrature phase-shift keying (4 bit/symbol) over five fiber spans, 430 km in total. The two PDM channels are demultiplexed using a beam splitter and automatic optical polarization control with interference detection. For the first time, PDM signal tracking speeds of up to 40 krad/s are...
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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