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研究了利用正常色散光纤压缩１．５５μｍ增益开关ＤＦＢ激光器出射的光脉冲。从激光器的单模速率方程出发，利用数值方法研究了在不同的增益开关状态下，输出光脉冲的时域及频域特性。以此光脉冲作为初始脉冲并利用非线性薛定谔方程及分步傅立叶方法研究其在正常色散光纤中的压缩效应。理论研究指出激光器的增益开关状态对输出光脉冲的啁啾分布有较大影响，从而影响了脉冲的压缩效果。实验中利用这种方法，将重复频率为５ＧＨｚ、初始脉宽为４２．６ｐｓ光脉冲压缩至６．２ｐｓ。理论与实验结果吻合。
The light pulses emitted by a 1.55μm gain switched DFB laser using a normal dispersion fiber are studied. Based on the single-mode rate equation of the laser, the time-domain and frequency-domain characteristics of the output light pulse under different gain switching states are studied numerically. Using this pulse as initial pulse, the squeezing effect in normal dispersion fiber was studied by nonlinear Schr 谔 dinger equation and step Fourier method. The theoretical research indicates that the state of the gain switch of the laser has a great influence on the chirp distribution of the output optical pulse, thus affecting the compression effect of the pulse. Experiments using this method, the repetition rate of 5GHz, the initial pulse width 42.6ps optical pulse compression to 6.2ps. The theoretical and experimental results are in agreement.