Analysis of the Phase Noise in Saturated SOAs for DPSK Applications

摘要

A theoretical model is used to analyze the impact of phase noise on the performance of semiconductor optical amplifiers (SOAs) in the saturation regime for differential phase-shift keying (DPSK) applications. It is found that the variance of the differential phase error scales as T~(2)/tau_(c)~(2) for tau_(c) T, where T is the bit period and tau_(c) is the carrier lifetime of the SOA. This suggests that the adverse effect of saturation-induced phase noise can be significantly reduced by increasing the bit rate or the carrier lifetime.