20 m水下无线蓝光LED通信系统样机设计

Design of a 20 m underwater wireless optical communication system based on blue LED

在清澈海水中,透射窗口在蓝绿光波段,蓝光在海水中具有很好的传输特性。为了满足深海观测网络及平台间的高速率、大容量的通信需求,本文提出了一种水下无线可见光通信系统。该系统采用470 nm LED阵列拼接结构,增大束散角,并且提出采用菲涅尔透镜作为光学天线,实现大视场接收。在20 m的水下通信距离下,成功实现了5 Mbit/s通信速率,误码率低至10^(-6)的可靠通信,并完整地组装出了工程样机,为后续的水下动态激光通信系统奠定了基础。

In pure seawater,the transmission window is in the blue-green light band,and blue light has good transmission characteristics.This paper proposes an underwater wireless optical communication system that uses a 470 nm LED array stitching structure,increasing the diverging angle.At the same time,we use Fres-nel lens as the optical antenna realizing the wide field of view receiving.At an underwater distance of 20 m,this system could successfully achieve reliable communication at a rate of 5 Mbit/s(data rate)and a BER of 10^(−6),which lays a foundation for subsequent underwater dynamic laser communication systems.