Cross-Phase Modulational Instability with High-Order Dispersion
Ren Zhijun Wang Hui Jin Hongzhen Ying Chaofu Jin Weimin Wan Xu (Information Optics Institute, Zhejiang Normal University, Jinhua 321004)
The effect of third order and fourth order dispersion on cross phase modulational instability based on extended nonlinear Schrdinger equation is investigated. The result shows: Third order dispersion has no effect on modulational instability. Because of fourth order dispersion, cross phase modulational instability occurs at two spectrum regions under the certain conditions in the both anomalous and normal dispersion regimes of fiber. Gain spectrum width of the first region of anomalous dispersion regime is larger than that of normal dispersion regime when other parameters are unchanged, and gain spectrum of the second region of anomalous dispersion regime is near the zero than that of normal dispersion regime, and two spectrum regions of two dispersion regimes have a corresponding relation when the parameters of fiber and the powers of two input lightwaves are certain.