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利用光注入半导体激光器产生的单周期振荡,实验获得了6.1—12.9GHz范围内频率连续可调的微波光信号.同时利用半导体激光器速率方程,对光注入半导体激光器产生高频微波进行了数值模拟.模拟和实验结果均表明微波信号产生于注入光和激光器腔模之间的拍频现象,其频率随着注入光强度和波长失谐的增大而增大,模拟结果预测该方法可以产生频率大于40GHz的高频微波.
By using the single-period oscillation generated by the light-injecting semiconductor laser, the microwave optical signal with continuously adjustable frequency in the range of 6.1-12.9 GHz was obtained experimentally, and the high frequency microwave generated by the semiconductor laser was numerically simulated by using the semiconductor laser rate equation. Both simulation and experimental results show that the beat frequency of the microwave signal originates from the injected light and the laser cavity mode. The frequency increases with the increase of the injected light intensity and wavelength mismatch. The simulation result predicts that the method can generate the beat frequency with the frequency greater than 40GHz high frequency microwave.