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根据分布反馈（ＤＦＢ）半导体激光器的耦合波理论和电吸收调制器模型，推导出了描述ＤＦＢ／ＥＡ集成器件中调制器的端面反射造成的激光器的静态频移和动态频移的解析表达式，动态频移（“反射啁啾”）正比于调制器的有效端面反射率。利用动态频移模型对光脉冲经过反常色散光纤传输后的波形进行了计算机仿真，取得了与实验一致的结果。结果表明：无论脉冲的初始啁啾的正负如何，“反射啁啾”总是使得传输后的脉冲变窄，当反射啁啾为正时，脉冲的上升沿出现“过冲”，而下降沿变缓；当反射啁啾为负时，情况与之相反。
According to the coupled wave theory of distributed feedback (DFB) semiconductor laser and the model of electroabsorption modulator, the analytical expression describing the static frequency shift and dynamic frequency shift of the laser caused by the end face reflection of the modulator in DFB / EA integrated device is deduced. The dynamic frequency shift (“reflected chirp”) is proportional to the effective end face reflectance of the modulator. The dynamic frequency shift model was used to simulate the waveform of the optical pulse transmitted by the anomalous dispersion fiber, and the experimental results were obtained. The results show that the “reflected chirp” always narrows the transmitted pulse regardless of the positive and negative initial pulse chirp. When the reflected chirp is positive, “overshoot” occurs at the rising edge of the pulse, while the falling edge Slow; when the reflected chirp is negative, the situation is the opposite.