Pump phase-locking method dependence of ND-PSA repeaters on multi-span transmission of QPSK-PCTWs in dispersion compensated links

Pump phase-locking method dependence of non-degenerate phase-sensitive optical amplifier (ND-PSA) repeaters on phase-conjugated twin waves transmission is investigated. Simulation results show ND-PSAs with an optical phase-locked loop method can extend a transmission distance compared to the case of an optical injection locking method in dispersion compensated links.