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从非线性薛定谔方程出发得到了色散缓变光纤 (DDF)中交叉相位调制 (XPM)不稳定增益谱。研究了增益谱随入纤功率及光纤纵向色散参量的变化关系。结果表明 :反常色散区的增益谱宽比正常色散区宽 ,且峰值增益高 ;DDF中 XPM不稳定增益谱宽比常规光纤的宽 ,二者的比值随传输距离与光纤色散参量的乘积成指数增长 ;DDF的反常色散区是产生调制不稳定的较好的色散介质
Starting from the nonlinear Schrödinger equation, the cross-phase modulation (XPM) unstable gain spectrum in the dispersion-slowing fiber (DDF) is obtained. The relationship between the gain spectrum and fiber power and fiber longitudinal dispersion parameters was studied. The results show that the gain spectral width of the anomalous dispersion region is wider than that of the normal dispersion region and the peak gain is high. The spectral width of the unsteady gain of XPM in DDF is wider than that of the conventional fiber, and the ratio of the two increases with the dispersion of the fiber dispersion parameter Growth; DDF’s anomalous dispersion area is to produce a better modulation of unstable dispersion medium