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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,理论上推导了色散缓变光纤(DDF)中交叉相位调制(XPM)不稳定增益谱,分析了4阶色散、5阶非线性系数以及光纤纵向色散参量对增益谱的影响.数值仿真结果表明:在DDF的正、反常色散区,4阶色散导致XPM不稳定均发生在两个频谱区.正(负)5阶非线性使增益谱的谱宽和峰值增大(减小).DDF中XPM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的增大,DDF中XPM不稳定越来越明显.
Based on the generalized nonlinear Schr (o) dinger equation with higher-order dispersion and higher-order nonlinearity, the unsteady gain spectrum of cross-phase modulation (XPM) in DDF was theoretically derived. The fourth-order dispersion, Linear coefficient and longitudinal dispersion parameter of optical fiber on the gain spectrum.The numerical simulation results show that in the positive and anomalous dispersion region of DDF, the fourth order dispersion causes XPM instability to occur in both spectral regions.The positive (negative) fifth order nonlinearity The spectral width and peak value of the gain spectrum are increased (decreased). The XPM unstable gain spectrum width in the DFT is wider than that of the conventional fiber, and as the longitudinal dispersion parameter of the fiber increases, the XPM instability in the DDF becomes more and more obvious.