用半导体环形激光器产生混沌信号
Generation of chaos in semiconductor ring laser with optical injection
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摘要: 提出了一种由一个分布式反馈激光器为主激光器和一个半导体环形激光器为从激光器组成的主从式激光混沌系统方案，主激光器产生的光单向注入到从激光器中，通过调整注入系数、主从激光器的失谐频率和从激光器的偏置电流，使从激光器工作在混沌状态，输出混沌信号。从基于光注入条件下的环形激光器的速率方程组入手，数值模拟了主从激光器的失谐频率、注入系数和从激光器的偏置电流3个工作参量对从激光器输出动态的影响。研究表明：外光注入条件下，半导体环形激光器可以产生混沌信号。通过分析得出:当失谐频率为3.9 GHz、注入系数为0.07、偏置电流为81 mA时，环形激光器可以产生功率谱平坦、带宽较宽的高质量混沌信号。Abstract: The unidirectional master-slave scheme for generating chaos is demonstrated, which consists of a distributed feedback laser and a semiconductor ring laser(SRL). The SRL, under suitable bias current, has a chaotic output due to an optical injection from the master laser with suitable detuning frequency and injection coefficient. By numerical simulation based on the rate equations of the semiconductor ring laser subjected to an external injection, bifurcation diagrams are derived, of the parameters of interest: the detuning frequency, injection coefficient and the bias current of the SRL. The result shows that, high-quality chaos with flat power spectrum can be generated in the SRL when the detuning frequency is 3.9 GHz, the injection coefficient is 0.07 and the bias current of the SRL is 81 mA.
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