DP-OOK to QPSK conversion based on vector phase-sensitive amplification bridging core and access networks

The interworking between different networks can be effectively realized by implementing all-optical format conversion, and it can improve the flexibility, efficiency and expansibility of the communication system. The all-optical signal processing scheme is only carried out in the optical domain, and it does not require optical-electric-optical (O-E-O) conversion, which greatly improves the transmission rate and processing speed of the communication system. In this paper, an all-optical format conversion scheme from dual-polarization on-off keying (DP-OOK) to quadrature phase shift keying (QPSK) is proposed. The scheme is based on vector phase-sensitive amplification (PSA). Constellation and eye diagram of signals at each stage of system are obtained by simulation, and BER and EVM are calculated to show the performance of the system.