基于法布里-珀罗半导体激光器实现高重复频率光脉冲的时钟分频

Clock Division of High-Repetition Rate Optical Pulses from Fabry-Pérot Laser Diode

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 high-repetition rate optical pulses clock division is investigated based on the nonlinear dynamics of optically injected Fabry-Perot semiconductor laser. A train of 6.32 GHz injected optical pulses divided into 3.16 GHz is obtained. Effects of the bias current of laser diode, the injected optical power, and injected optical spectrum etc. on the clock division, has been analyzed. The high-repetition rate optical pulses clock division is realized with the periodically oscillated nonlinear dynamics in optically injected F-P laser diode. The clock division will occur when the injected pulse spectral width is narrow, a certain longitudinal mode of the F-P laser diode is locked, and the conditions of low bias current and appropriate injected optical power are met. In addition, the effect of the laser bias currents, linewidth enhancement factor, and injected optical power on clock division is numerically investigated. Numerical simulations are consistent well with the experimental results.