60-km Transmission of 28-Gb/s QPSK Upstream Signal in RSOA-based WDM PON Using SBS Suppression Technique

We experimentally demonstrate the 60-km transmission of 28-Gb/s QPSK signal in RSOA-based coherent WDM PON. The frequency dithering of seed laser and fast carrier phase estimator are employed to suppress the SBS and track the laser's phase, respectively.