Wang Cheng, Raghunathan Ravi, Schires Kevin, Chan Sze-Chun, Lester Luke F, Grillot Frédéric
Opt Lett. 2016 Mar 15;41(6):1153-6. doi: 10.1364/OL.41.001153.
We present an experimental investigation on the period-one dynamics of an optically injected InAs/GaAs quantum dot laser as a photonic microwave source. It is shown that the microwave frequency of the quantum dot laser's period-one oscillation is continuously tunable through the adjustment of the frequency detuning. The microwave power is enhanced by increasing the injection strength providing that the operation is away from the Hopf bifurcation, whereas the second-harmonic distortion of the electrical signal is well reduced by increasing the detuning frequency. Both strong optical injection and high detuning frequency are favorable for obtaining a single sideband optical signal. In addition, particular period-one oscillation points of low sensitivity to the frequency detuning are found close to the Hopf bifurcation line.
我们对作为光子微波源的光注入InAs/GaAs量子点激光器的周期一动力学进行了实验研究。结果表明，通过调整频率失谐，量子点激光器周期一振荡的微波频率可连续调谐。只要操作远离霍普夫分岔，通过增加注入强度可提高微波功率，而通过增加失谐频率可有效降低电信号的二次谐波失真。强光注入和高失谐频率都有利于获得单边带光信号。此外，在靠近霍普夫分岔线处发现了对频率失谐低灵敏度的特定周期一振荡点。
