Coded modulation PDM-QPSK transmission over 6,370 km dispersion managed NZDSF spans with 1.5 to 4 dB margin

We transmit coded modulation PDM-QPSK over 6,370 km of dispersion managed NZDSF spans. Coded modulation enables absolute phase detection without pilot symbols and provides 1.5 to 4 dB Q-factor margin.

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