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在考虑光纤损耗下，从理论上推导出具有饱和非线性的非克尔光纤中自相位调制效应产生啁啾的解析表达式；并在计算机上模拟了光纤中啁啾的演变过程。结果表明，非克尔光纤中的饱和效应越强，自相位效应所产生的啁啾越小；随着光纤传输，啁啾不断增大；而且啁啾与光纤损耗、入射脉冲的峰值功率等因素有关。
Considering the loss of fiber, the analytical expression of chirp in self-phase modulation in non-Kerr fiber with saturation nonlinearity is deduced theoretically. The evolution of chirp in fiber is simulated by computer. The results show that the stronger the saturation effect in the non-Kerr fiber, the smaller the chirp caused by the self-phase effect; the higher the chirp with the fiber transmission; and the other is the chirp and fiber loss, the peak power of the incident pulse related.