The phase-mismatch effect, caused by the difference in confinement factor between transverse electric (TE) and transverse magnetic (TM) modes, has not been observed in semiconductor optical amplifiers (SOAs) and is not typically accounted for. In this work, we investigate the characteristics of the phase-mismatch four wave mixing (FWM) effect, which occurs in SOA devices. Our results reveal a sinc-like response in the intensity of co- and counter-FWM conjugates as a function of the detuning shift between interacting beams. It is demonstrated that the coherence lengths between the phase match/mismatch cycles differ between co- and counter-propagating nondegenerate FWM experiments and depend on the amplified TE/TM polarizations of interacting waves aligned with respect to the birefringent axes of SOAs. The coherence lengths between each phase match/mismatch cycle in co-propagation experiments are found to be 1600 and infinite GHz, respectively, compared to 800 and 400 GHz found in counter-propagation experiments.

在半导体光放大器（SOA）中未观察到由横向电（TE）模式和横向磁（TM）模式之间的限制因子差异引起的相位不匹配效应，通常不予考虑。在这项工作中，我们研究了在SOA器件中发生的相位不匹配四波混合（FWM）效应的特征。我们的结果表明，共-FWM和反-FWM共轭物强度中的正弦状响应是相互作用光束之间失谐位移的函数。证明了相匹配/不匹配周期之间的相干长度在共传播和反向传播的非退化FWM实验之间不同，并且取决于相对于SOA的双折射轴对齐的相互作用波的放大的TE / TM偏振。