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利用微扰理论方法推导了飞秒光孤子脉冲在具有一定带宽限制的分布放大光纤传输系统中传输时，脉冲宽度和频移的变化方程，此方程有稳态解，并得到稳定传输时，脉冲宽度及频移的解析表达式
The perturbation theory method is used to derive the variation equation of pulse width and frequency shift when the femtosecond soliton pulse propagates in a distributed optical fiber transmission system with a certain bandwidth limitation. The equation has a steady state solution and a stable transmission, the pulse The analytical expression of width and frequency shift