交叉相位调制不稳定性的进一步分析

从耦合非线性薛定谔方程出发,分析了光纤中两光波因交叉相位调制(XPM)所致的调制不稳定性(MI)产生的条件及增益谱。结果表明,当一光波处于正常群速度色散(GVD)区,另一光波处于反常群速度色散区时,与两光波参数有关的扰动增益谱应有3种可能的形式;在一定条件下,在某一微扰频率范围内,甚至还会同时出现两种形式的增益谱。

Further analysis of modulation instability induced by cross-phase modulation

Based on the coupled nonlinear Schrdinger equation,conditions and gain spectra of modulation instability(MI) induced by cross-phase modulation(XPM) of two optical waves in the optical fiber are analyzed in detail. The results show that when one of the two optical waves propagates in the normal group-velocity dispersion (GVD) regime and the other in the anomalous regime,depending on parameters of the two optical waves,perturbation gain spectra may take three possible forms. Under certain circumstances,it is even possible that there are two forms of gain spectra within certain range of perturbation frequency.