Multi-channel phase regenerator based on polarization-assisted phase-sensitive amplification

We propose and demonstrate simultaneous phase regeneration of six non-return-to-zero (NRZ) binary phase shift keying (BPSK) signals in a single nonlinear medium. The regenerating system which exhibits binary step-like phase transfer functions uses four-wave mixing (FWM) in degenerate dual-pump vector parametric amplifiers implemented in the same nonlinear optical fiber, followed by polarization filtering. Bit-error-ratio (BER) measurements confirm optical-signal-to-ratio (OSNR) improvement and negligible cross-talk across all the regenerated channels, which were impaired at the regenerator input by broadband phase noise