空间光通信视音频同步无线传输技术研究  

Research on video and audio synchronous wireless transmission in space optical communication system

作　　者：王丹[1,2] 李真[1,2] 周文超[3] 李广玮 陈振强 尹浩[1,2] 朱思祁[1,2] 李安明[1,2] 

机构地区：[1]暨南大学光电信息与传感技术广东普通高校重点实验室,广东广州510632 [2]暨南大学光电工程系,广东广州510632 [3]广东省第二强制隔离戒毒所,广东佛山528100

出　　处：《激光与红外》2017年第11期1411-1415,共5页Laser & Infrared

基　　金：广东省教育厅创新基金项目(No.2013KJCX0022);国家自然科学基金项目(No.61275046;No.61475067);中央高校科研专项基金项目(No.11615454)资助

摘　　要：设计并演示一个可实现视音频信号同步无线传输的自由空间光通信系统。该系统包括信号发生、调制和接收模块。对由信号发生模块输出的视音频信号进行时分复用(TDM),复用信号以电信号形式作用于声光调制器(AOM)并将其加载于入射到AOM的激光束上,AOM输出调制光信号,最后接收模块还原出视音频信号。整个通信系统带宽为6.7 MHz,通过电-光-电转换过程,将时分复用和声光调制相结合实现了视音频信号同步无线传输。本系统针对具体工作环境,自建核心电路:时分复用/解复用电路和输出光端机电路,采用单片机调控输出信号质量。实验证明该系统具备成本低廉、实用性强和灵活性高等优点,为监控系统、应急通信等应用场合提供一种简易有效的视音频信号同步无线传输方案。A free-space optical （FSO） communication system with video and audio signals synchronous wireless trans-mission has been designed and demonstrated. The system consists of signal transmitter, modulator and receiver. Thevideo and audio signals outpntted from signal transmitter were transformed into multiplexer signal by means of thetime-division multiplexer （TDM）. The multiplexer signal was added to laser beam when it connected to the acoustic-optical modulator （AOM） in the form of electric signal. The receiver was used to convert the light signal outputtedfrom AOM into electric signal. The 3 dB bandwidth of the system is 6. 7 MHz. Through the process of electric-light-e-lectric conversion, the synchronous wireless transmission of video and audio signals was achieved with the combinationof time-division muhiplexing and acousto-optic modulation. The circuit of time-division muhiplexer/de-multiplexer andphotoelectric conversion circuit were built according to the specific work environment. The quality of the output signalwas controlled and adjusted by a microcontroller. The experiments proves that the system has some advantages of flexi-bility, practicality and low cost. And it provides an efficient scheme of synchronous wireless transmission of video andaudio signals for monitoring system and TV access network.

关 键 词：自由空间光通信 时分复用 声光调制 光电转换 电路 

分 类 号：TN929[电子电信—通信与信息系统]