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基于二能级系统建立量子点激光器的载流子-光子速率方程模型,分析量子点激光器的瞬态响应和调制特性,获得其动态特性。同时分析了注入电流对量子点激光器输出光子密度的影响,随着注入电流的增大,激光器光电延迟时间缩短,弛豫过程缩短,弛豫振荡频率增大,且输出光子峰值和稳态功率增加,适当增加注入电流可拓宽量子点激光器调制带宽。通过小信号调制分析,发现量子点激光器上限调制频率比普通激光器高一个数量级,证明了其具有良好的高频调制特性。
Based on the two-level system, a carrier-photon velocity equation model of quantum dot laser is established, and the transient response and modulation characteristics of the quantum dot laser are analyzed to obtain its dynamic characteristics. At the same time, the influence of injection current on the output photon density of quantum dot laser is analyzed. With the increase of injection current, the laser photoelectric delay time is shortened, the relaxation process is shortened, the relaxation oscillation frequency is increased, and the output photon peak and steady state power are increased The appropriate increase of injection current can broaden the modulation bandwidth of quantum dot laser. Through the modulation analysis of small signal, it is found that the upper limit of the quantum dot laser modulation frequency than the average laser an order of magnitude, proved it has good high frequency modulation characteristics.