Post-Nonlinearity Compensation with Data Driven Phase Modulators in Phase Shift Keying Transmission Systems

A new scheme for post-nonlinearity compensation is proposed to reduce the phase jitter in phase shift keying transmission systems. A phase modulator is used to modulate the phase of the data pulses in front of the receiver. The magnitude of the phase modulation is directly proportional to the detected pulse intensity and the sign is opposite to the nonlinear phase shift caused by self-phase modulation (SPM). Thus, the nonlinear phase noise induced by amplitude fluctuation and SPM is partially compensated. We show by numerical simulations that differential phase shift keying (DPSK) dispersion managed soliton (DMS) at 10 Gb/s with such a post-nonlinearity compensation can provide greater than 3 dB improvement in ultra-long haul DWDM transmissions.