112-Gb/s DP-QPSK transmission over 7,860-km DMF using phase-conjugated copy and digital phase-sensitive boosting with enhanced noise and nonlinearity tolerance

We demonstrate a phase-sensitive boosting technique for extending the reach of 112-Gb/s DP-QPSK. We transmit the signal alongside a phase-conjugated idler. Nonlinearity is partially mitigated by detecting them jointly and summing them with phase conjugation.

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