基于PSK调制的激光通信系统研究

Research on PSK modulation-based laser communication systems

设计了一种基于PSK(相移键控)外调制的激光通信系统。该系统选用637nm的全固态激光器作为光源,利用FPGA(现场可编程门阵列)开发板作为调制解调硬件控制声光调制器将调制信号加载于激光,通过大气信道传输,采用光电倍增管作为激光接收器。对传统PSK解调进行了改进,消除了相位模糊现象,搭建了完整的激光通信系统实验平台。实现了通信速率为115.2kbit/s、误码率低于10-8的激光通信系统。

This paper proposes a PSK external modulation-based laser communication system.Using a 637 nm all-solid-state laser as a light source and FPGA demoboard as the modem hardware to control the acousto-optic modulator,this system applies the modulated signals to the laser and,using aphotomultiplier tube as a laser receiver via atmospheric channel transmission,improves the traditional PSK demodulation,eliminates phase ambiguity and sets up a complete experiment platform for laser communication systems,realizing a laser communication system with the serial communication rate of 115.2kbit/s and bit error rate of lower than 10^-8.