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在考虑光纤损耗及高阶色散的情况下,以三、四阶色散项的耦合非线性薛定谔方程为基础,研究高阶色散对交叉相位调制不稳定性的影响.研究表明:三阶色散对调制不稳定性不起作用;由于四阶色散的影响,在光纤的正常、反常色散区,交叉相位调制不稳定性均发生在两个频谱区.且反常色散区两频谱区都比正常色散区的宽,反常色散区第二频谱区比正常色散区的更靠近零点.光纤损耗对增益谱的谱宽有较大影响,它使增益的谱宽变窄,且随传输距离的增大谱宽变得更窄.
Based on the coupled nonlinear Schrödinger equation for the third and fourth order dispersion terms, the influence of higher order dispersion on the cross-phase modulation instability is investigated. The results show that the third order dispersion The instability does not work; due to the influence of the fourth-order dispersion, the cross-phase modulation instability occurs in both spectral regions in the normal and anomalous dispersion regions of the fiber, and the two spectral regions in the anomalous dispersion region are larger than those in the normal dispersion region The second spectral region in the wide and the anomalous dispersion region is closer to zero than the normal dispersion region. Fiber loss has a great influence on the spectral width of the gain spectrum, which narrows the spectral width of the gain, and increases with the increase of transmission distance. Narrow.