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To improve the performance and capability of the transmission networks, all-optical processing of the complex high-order modulation signals such as phase regeneration, field decomposition, and modulation format conversion, which predominates the electronic processing in terms of traffic cost and flexibility, is further demanded as respect to the endless pursuit of low noise amplifier.   During the past decade, phase-sensitive fiber-optic parametric amplifiers based on four-wave mixing (FWM) in highly nonlinear fiber (HNLF) has become a strong candidate for nonlinear optical processing owing to its ultra-fast response time, the intrinsically noiseless amplification, and especially  the unique trait of squeezing. Especially, the phase-sensitive nonlinear process can provide the high phase sensitivity and binary stair/like phase-to-phase transfer function are a  Phase regeneration  Field decomposition