包含高阶色散的色散缓变光纤中交叉相位调制不稳定性分析

从包含高阶色散的广义非线性薛定谔方程出发,得到了色散缓变光纤中交叉相位调制不稳定增益谱,研究了增益谱随入射功率及光纤纵向色散参量的变化关系.结果表明：由于四阶色散的影响,在色散缓变光纤的正、反常色散区,交叉相位调制不稳定均发生在两个频谱区.反常色散区两频谱区宽度均比正常色散区宽,且反常色散区第二频谱区更靠近零点,说明色散缓变光纤中交叉相位调制不稳定更容易发生在反常色散区.增益谱宽都随两入射光波功率比值的增加而增大.色散缓变光纤中交叉相位调制不稳定增益谱宽比常规光纤的宽,且随着光纤纵向色散参量μ的增大色散缓变光纤中交叉相位调制不稳定越来越明显.

Cross-Phase Modulational Instability with High-Order Dispersion in Decreasing Dispersion Fibers

The cross-phase modulational instability was obtained based on extended nonlinear Schrdinger equation with high-order dispersion considered.The gain spectra as a function of incident power and axilly-varying dispersion parameter were given respectively.The results show that because of fourth-order dispersion,cross-phase modulational instability occurs at two spectrum regions in both the normal and the anomalous dispersion regime of fiber.Gain spectra of the two regions of anomalous dispersion regime are larger than those of normal dispersion regime,and gain spectrum of the second region of anomalous dispersion regime is near zero than that of normal dispersion regime,which means cross-phase modulational instability can be produced in anomalous dispersion regime more easily.The spectra widths increase with the increasing of the ratio of incident powers.The spectrum width of cross-phase modulational instability in Decreasing Dispersion Fiber(DDF) is larger than that in common fiber,and the spectrum width in DDF increases with the increasing of axilly-varying dispersion parameter.