【摘要】 推导了三、五阶非线性共存时有损耗单模色散缓变光纤中同偏振、不同波长的两光波的交叉相位调制不稳定条件和增益谱。在色散缓变光纤负色散区,详细分析了五阶非线性系数、色散纵向变化参量、两扰动的频率大小关系对交叉相位调制不稳定条件和增益谱的综合影响。结果表明,正、负五阶非线性分别对交叉相位调制不稳定性起加强和抑制的作用;两扰动频率大小关系不同,色散纵向参量的变化对调制不稳定增益谱的影响也不同;随参数的不同,增益谱存在有截止频率和无截止频率2种形状。更多还原

【Abstract】 In the case of co-existence of cubic and quintic nonlinearity,the condition and power gain spectra of modulation instability induced by the cross-phase modulation for two optical waves of different frequencies with the same polarizations in loss,single-mode,decreasing dispersion fibers were derived.The synthetic effects of the quintic nonlinear coefficients,the dispersion longitudinal varying parameters,and the size relation of the two perturbation frequencies on the condition and power gain spectra of modulation instability were analyzed in detail in the negative dispersion regime of decreasing dispersion fibers.The results show that,the positive and the negative quintic nonlinearity will intensify and suppress modulation instability induced by the cross-phase modulation,respectively.If the size relation of the two perturbation frequencies is different,the dispersion longitudinal varying parameters influcence the gain spectra of modulation instability in different ways.Depending on different parameters,the gain spectra have two different shapes.Some may have cut-off perturbation frequencies while others may have not.更多还原