建立了绿光水下激光传输的发射和接收实验系统，在威海近岸海域对调制激光信号在水下的传输特性进行了实验研究。系统以光电倍增管作为探测器，在不同接收负载情况下，观测了不同传输距离下绿光脉冲信号的接收波形。实验结果表明，大的接收负载有助于提高探测距离，采用1 MΩ接收负载时的最大探测距离为26 m。根据实验数据拟合不同距离处的接收光强，激光在海水中的传输信号强度呈e指数衰减趋势，其衰减系数为0.5 m-1,可以推断在浑浊度较小的海域光传输距离会增加。

A system including underwater green light laser transmitter and receiver is designed. The optical transmission experiment is made in coastal waters of Weihai and a photomultiplier tube is used as a detector. Different waveforms and signal strengths under different distances are measured by using different receiving loads. The results show that a bigger load will get an increased distance. The effective transmission distance is 26 m when the load is 1 MΩ. Data is fitted under different distances, and it is found that the attenuation in coastal waters appears e exponential decay, the coefficiency is 0.5 m-1. It can be deduced that the system will get a better performance in sea with smaller attenuation.