Phase regeneration of phase modulated signals in mode multiplexed system using a silicon waveguide

The phase regeneration for the mode-division multiplexing (MDM) differential phase shift keying (DPSK) signals in a single multimode silicon waveguide, is proposed and successfully demonstrated in the simulation. The regeneration is based on the mode-selective phase sensitive amplification (PSA). When the pumps and the signal are carried on the same mode, the signal will be phase-regenerated because of the strong phase sensitive interaction. Otherwise, the weak phase sensitive interaction will be achieved due to the phase mismatch. Simulation results show an obvious phase squeezing for the degraded two-mode division multiplexing DPSK signals.