Phase Regeneration of QPSK Signal in SOA using Single-stage, Wavelength Converting PSA

We demonstrate, for the first time, all-optical phase regeneration of a quaternary phase shift keying (QPSK) signal through phase sensitive amplification (PSA) in nonlinear semiconductor optical amplifiers (SOAs), using a scheme only previously demonstrated in highly nonlinear fibre (HNLF). We make use of a highly tunable phase quantising scheme to circumvent some of the limitations imposed by the use of SOAs and show that it may function in either a conjugating or non-conjugating manner.

Dataset for Bottrill, K., Kakarla, R., Parmigiani, F., Venkitesh, D. and Petropoulos, P. (2015) Phase regeneration of QPSK signal in SOA using single-stage, wavelength converting PSA. IEEE Photonics Technology Letters, 1. (doi:10.1109/LPT.2015.2489843)