激光脉冲是目前水下无线光通信信号的主要形式, 针对水下传输时由多重光散射引起的激光脉冲时域波形展宽问题, 采用简单的小角度近似方法进行分析。将经典电子散射理论应用于光子散射研究, 从L. B. Stotts模型出发, 通过选择合适的水体散射相函数, 推导出激光脉冲波形表达式, 模拟计算在一定水质条件下脉冲传输不同距离后的脉宽。模拟结果与实验测量数据吻合, 并且在较长距离时的精度优于传统模拟方法, 验证了该方法的有效性, 为解决水下较长距离时激光通信码间串扰问题提供依据。

Laser pulse is the main signal of submarine optical wireless communication at present. To simulate the time-domain broadening of laser pulse propagating underwater, the small-angle approximation method, as a simple and inexpensive one, is presented in this paper. The classical electron scattering theory is applied to the photo scattering effects. Based on L. B. Stotts model and the appropriate water volume scattering function, an expression of laser pulse waveform is derived, and the widths of pulse propagating different distances are simulated under certain water quality conditions. The simulated results are in agreement with experimental measurement data and their precision, for longer-distance propagation, is higher than that of traditional methods, which can demonstrate the validity of this method, and provide an important basis for dealing with the problem of inter-symbol interference of longer-distance laser communication underwater.