由于光器件的发展，改进常规光无线信息交换系统，实现高速率的光无线通信研究得到了越来越多的关注；设计了一套基于声光效应的无线激光DQPSK调制系统，搭建了预编码电路，利用声光调制器进行实验方案验证，测试了码元速率2Mbit／s下调制信号的动态特性，对其进行了频谱分析；结果表明：在高码元速率下，该设计系统信噪比高，可应用于需要高的传输速率和高可靠性的无线激光通信系统中。%The state of development of optical devices has led to increased interest in high data rate wireless optical communication schemes that constitute a viable alternative to conventional wireless technologies for information exchange.In this paper,a DQPSK modulation system,based on acoustic-optic effect,has been designed for wireless laser communication,a precoding circuit has been arranged,the modulation scheme was implemented and demonstrated with a acoustic-optic modulator,the transient data and spectrum of the modulated light signal was tested and investigated at a data rate of 2Mbit/s and the outcome shows that the modulation system has a high SNR at a high data rate.The deigned scheme was quite suitable for wireless laser communication system which needs high operation frequency and reliability.
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