Zhuang Jun-Ping, Li Xiao-Zhou, Li Song-Sui, Chan Sze-Chun
Opt Lett. 2016 Dec 15;41(24):5764-5767. doi: 10.1364/OL.41.005764.
Generation of frequency-modulated continuous-wave (FMCW) microwave signals is investigated using the period-one (P1) dynamics of a semiconductor laser. A modulated optical injection drives the laser into P1 oscillation with a modulated microwave frequency, while adding feedback to the injection reduces the microwave phase noise. Using simply a single-mode laser, the tunability of P1 dynamics allows for wide tuning of the central frequency of the FMCW signal. A sweep range reaching 7.7 GHz is demonstrated with a sweep rate of 0.42 GHz/ns. When the external modulation frequency matches the reciprocal of the feedback delay time, feedback stabilization is manifested as an increase of the frequency comb contrast by 30 dB for the FMCW microwave signal.
利用半导体激光器的周期一（P1）动力学特性对调频连续波（FMCW）微波信号的产生进行了研究。调制光注入驱使激光器以调制微波频率进入P1振荡，同时向注入光中添加反馈可降低微波相位噪声。仅使用单模激光器时，P1动力学的可调谐性允许对FMCW信号的中心频率进行宽范围调谐。展示了扫频范围达到7.7 GHz且扫频速率为0.42 GHz/ns的结果。当外部调制频率与反馈延迟时间的倒数匹配时，对于FMCW微波信号，反馈稳定表现为频率梳对比度增加30 dB。
