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集总式放大链路中,放大器的周期分布,等效于形成一折射率光栅,它为四波混频提供了相位匹配的条件,产生边带不稳定性.本文通过解析和数值模拟的方法,研究了周期集总式放大链路中,交叉相位调制边带不稳定性.解析研究中,根据耦合方程的稳态解,计算了反常色散与正常色散光纤链路中由于扰动而产生的边带不稳定性的增益;数值模拟中,利用分裂步长傅里叶变换法与Monte_Carlo方法,得出了输出光脉冲的频谱,说明输出光脉冲频谱中产生新的边带.两种方法的计算结果表明,在周期集总式放大光通信链路中,存在交叉相位调制边带不稳定性,两种方法得到的结论基本一致.
In the lumped-type amplification chain, the period distribution of the amplifier is equivalent to forming a refractive index grating, which provides the condition of phase matching for the four-wave mixing and creates the sideband instability.Through the methods of analytical and numerical simulation , The instability of the cross-phase modulation sidebands in the periodic lumped amplification link is studied.According to the steady-state solution of the coupled equations, the sidebands due to the perturbations in the anomalous dispersion and normal dispersion fiber links are calculated With the instability of the gain; numerical simulation, the use of split-step Fourier transform and Monte Carlo method, the output spectrum of the light pulse obtained, indicating that the output light pulse spectrum generated by the new sideband. The results show that the cross-phase modulation sideband instability exists in the periodic lumped optical communication links, and the conclusions obtained by the two methods are basically the same.