四阶色散和五阶非线性对零色散附近交叉相位调制不稳定性的综合影响

从包含高阶色散和高阶非线性的广义非线性薛定谔方程出发,研究了零色散附近交叉相位调制不稳定性增益谱,分析了四阶色散和五阶非线性系数对增益谱的影响.结果表明：当光脉冲工作在零色散附近时,四阶色散对交叉相位调制不稳定性起决定作用,它使增益谱变宽.正（负）五阶非线性使增益谱的谱宽和峰值增大（减小）.随着二阶色散的增加,四阶色散对增益谱的影响越来越小.

Synthetic Effect of Both Fourth-order Dispersion and Quintic Nonlinearity on Cross-phase Modulation Instability in Region of Minimum Group-velocity Dispersion

Taking into account high-order dispersion and high-order nonlinearity, the gain spectra of cross-phase modulation (XPM) instability in the region of minimum group-velocity dispersion of fiber was investigated based on extended nonlinear Schrdinger equation with fiber loss considered. The effects of fourth-order dispersion and quintic nonlinearity to the gain spectra were analyzed. The results show that the fourth-order dispersion, which increases the width of the gain spectra, dominates the modulation instability when the second-order dispersion approaches the minimum value at the zero dispersion wavelength. The positive (negative) quintic nonlinearity will make the width and the peak value of the gain spectra larger (smaller). The influence of the fourth-order dispersion to the gain spectra decreases with the increasing of the second-order dispersion.