水下激光脉冲传输时域展宽仿真分析

Simulation and Analysis on Time-domain Broadening of Underwater Laser Pulse Transmission

激光脉冲是无线光通信信号在水下传输的主要表现形式,并且多重散射效应会引起激光脉冲时域波形的展宽。为了解决时域展宽问题,研究采用小角度近似处理方法,通过Fournier-Forand和Henyey-Greenstein散射相函数,推导出激光脉冲时域波形表达式,并在一定水质条件下模拟不同脉冲宽度的激光脉冲传输不同距离后的时域展宽。通过脉冲展宽因子可以选择合适的脉宽,从而改善水下激光通信时隙间的串扰,降低接收端的误码率。

Laser pulse is the main form of wireless optical communication signals underwater,and multiple scattering effects can cause that the time-domain waveform of laser pulses is broadened. In order to solve the problem of time-domain broadening, in this paper, a small-angle approximation method is proposed. Then the expression of time-domain waveform of laser pulse can be deduced by scatter phase function proposed by Fournier-Forand and Henyey-Greenstein. The time-domain waveform broadening of laser pulses in different widths transporting different distance under certain water conditions are also simulated. By pulse broadening factor the appropriate pulse width can be selected;the interstitial crosstalk in underwater laser communication can be improved,so the error rate of the receiver will be reduced.