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实验研究了重复速率为6.32 GHz的光脉冲注入法布里-珀罗(Fabry-Pérot)半导体激光器实现3.16 GHz光脉冲输出的时钟分频现象,讨论了Fabry-Pérot半导体激光器的偏置电流、注入光功率、注入光光谱以及光谱线宽等因素对时钟分频的影响。利用光注入半导体激光器产生的周期二振荡非线性动力学特性,实现了高重复速率光脉冲的时钟分频。研究表明,当注入光的光谱较窄且锁定Fabry-Pérot半导体激光器某一纵模时,在较低的偏置电流和一定的注入光功率时,时钟分频才能发生。采用半导体激光器的速率方程,通过数值模拟,研究了半导体激光器的偏置电流和线宽增强因子以及注入光功率对时钟分频的影响,所得结果与实验结果相吻合。
The experiment results show that the pulse rate of 6.32 GHz can be divided into 3.16 GHz optical pulse output by Fabry-Pérot semiconductor laser and the bias current of Fabry-Pérot semiconductor laser is implanted Optical power, injection light spectrum and spectral linewidth and other factors on the clock frequency. By using the nonlinear oscillatory characteristics of the periodic two oscillations generated by the semiconductor laser, the clock division of the high repetition rate optical pulse is realized. Research shows that when the spectrum of the injected light is narrow and a longitudinal mode of the Fabry-Pérot semiconductor laser is locked, clock division can occur at a lower bias current and a certain injected optical power. By using the rate equation of semiconductor laser, the effects of bias current, linewidth enhancement factor and power of injected laser on the clock frequency are studied by numerical simulation. The results are in good agreement with the experimental results.