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。

An analytical expression describing dynamic frequency shift (“reflection chirp”) of the DFB semiconductor laser due to residual end reflection of the attached electroabsorption modulator is derived. By a computer simulation, we find that the optical pulses through transmission in the dispersive optical fiber are narrowed and distorted due to this “reflection chirp” which is well agreed with experimental results.