为了分析激光器调Q开关对无线光通信中信号脉冲的影响, 从激光形成的基本速率方程组出发, 在不同的Q开关函数模型下, 采用数值计算的方法, 对调Q激光器输出脉冲的功率和波形特性进行了理论研究和仿真实现, 取得了信号脉冲功率密度、脉冲宽度等仿真数据, 并将脉冲各项参量与通信系统中常用的升余弦滚降信号进行比较。结果表明, 调Q激光器输出脉冲有着较高的功率和良好的波形特性, 因而能够很好地适应长距离无线光通信, 并有效抑制码间串扰, 降低误比特率。

In order to analyze the influence of Q-switch in a laser on the output signal pulse in wireless optical communication, on the basis of the rate equations, under different Q-switch function models, the power and waveform characteristics of the output signal were theoretically analyzed and simulated. Then the obtained data were compared with the raised cosine roll-off signal. The results indicate that the output pulse of a Q-switch laser has excellent power and waveform characteristics, which make it suitable for long distance wireless optical communication, restraining code intercross and reducing the bit error rate effectively.