利用光注入半导体激光器的单周期振荡与多周期振荡状态,提出了一种级联光注入半导体激光器产生超宽带微波频率梳的方案。将由连续光注入激光器产生的光频率梳注入到另一个从激光器中,再次利用激光器的光注入效应,拓宽所产生的微波频率梳带宽。光注入半导体激光器速率方程的数值研究表明,二次注入时,选取合适的注入参数,微波频率梳在幅值变化分别为±2.5 dB,±5 dB,±10dB范围内,带宽可达到52,65,97 GHz。因此,所提级联注入方案可以获得平坦的超宽带微波频率梳。

Based on the single-periodic and multi-periodic oscillation states of an optically injected semiconductor laser, a scheme for the generation of an ultra-broadband microwave frequency comb through the cascaded optical injection of semiconductor lasers is proposed. In this scheme, the optical frequency comb produced from a slave laser with continuous-wave injection is injected into another one, to generate a microwave frequency comb with much wider bandwidth due to the optical injection effect of laser. The numerical investigation based on the rate equations of an optically injected semiconductor laser shows that, as for the second optical injection and the selection of appropriate parameters, the bandwidths of this microwave frequency comb reach 52, 65 and 97 GHz within amplitude fluctuations of ±2.5 dB, ±5 dB and ±10 dB, respectively. Therefore, the proposed cascaded injection scheme is effective in generating ultra-broadband microwave frequency combs with more flat property.