利用光谱窗滤波法对增益开关半导体激光器输出光脉冲消啁啾进行了理论分析，在线性啁啾近似下得到了啁啾光脉冲经Ｆ－Ｐ后的谱宽表达式，给出了经Ｆ－Ｐ后光脉冲的宽度、波形以及自相关测量时的波形因子与Ｆ－Ｐ参数的关系曲线．实验结果与理论分析基本一致． The spectral chirp of the output pulse of gain switched semiconductor laser is theoretically analyzed by spectral window filter. The spectral width expression of chirped light pulse after F-P is obtained by the linear chirp approximation. The F- P pulse width after the light, the waveform and the autocorrelation measurement waveform factor and F-P parameters of the relationship curve. Experimental results and theoretical analysis are basically the same.