基于光注入半导体激光器单周期振荡的光子微波产生及全光线宽窄化

本文对基于光注入半导体激光器的单周期动力学态产生光子微波并利用光反馈压缩其线宽进行了实验研究. 研究结果表明: 通过适当调节注入参数, 能对该方法产生的光子微波频率在数十GHz范围内进行连续、大范围地调节; 通过引入光反馈并精细调节反馈强度, 光子微波的线宽能够从40—100 MHz的范围被压缩约两个数量级至300—900 kHz范围;反馈长度对光子微波的线宽几乎没有影响, 但当反馈长度精细变化时, 光子微波频率会出现一定范围内的周期性漂移.

Generation of photonic microwave based on the period-one oscillation of an optically injected semiconductor lasers and all-optical linewidth narrowing

Based on the single period dynamics of optically injected semiconductor laser, the generation of photonic microwave and its linewidth narrowing effect by introducing optical feedback are experimentally demonstrated. The experimental results show that the photonic microwave frequency can be continuously and widely tuned in a range of several ten GHz by adjusting the injection parameters. By introducing an optical feedback and properly adjusting the feedback strength, the photonic microwave linewidth is reduced by about two orders of magnitude from a range of 40-100 MHz to a range of 300-900 kHz. The influence of optical feedback length on the microwave linewidth is not obvious except that the photonic microwave frequency exhibits an periodical variation in a small range when the feedback length is finely varied in a small range.