为了解决长距离逆向调制光通信系统中弱信号难以检测的难题, 将散斑检测方式用于逆向调制光通信中, 实现对逆向调制端弱小光信号抖动的检测.设计了系统方案和检测原理, 并实验完成了60 m距离上1.3 kHz数字信号的传输和330 m距离上模拟话音的传输.该检测方式简单、便宜、易于模块化, 在低速的逆向调制光通信系统中有较好的应用.

In the long-range Modulating Retro-Reflector (MRR) communication system, the retro-reflective signal is weak and difficult to be detected. In this manuscript, a novel detection mode of MRR communication based on speckle technology is proposed, which can detect small fluctuation of the light from the modulator. The novel detection mode is simple, modular, inexpensive and suitable for low speed MRR communication. System design as well as the detection principle is descripted. The experiment part was completed the transmission of 1.3 kHz digital signal on 60m distance and analog voice transmission on 330 m distance.