无线激光通信在高速视频传输中的应用

利用无线激光通信传输速率高的优势，设计并实现了一套622Mbps视频传输系统。将视频转换、数据处理、激光收发等功能集中在单块电路板上，提高了灵活性。使用片内异步先进先出队列（FIFO）组成乒乓操作，对连续视频数据流进行有效切换控制。采用曼彻斯特编码较好地从接收信号中恢复出数据和时钟，有利于接收串行数据流的边界检测和同步。实验表明，本系统可以稳定地传输视频，满足地面距离应用的需要，为进一步研究激光通信各项技术提供了平台。

Application of wireless laser communication to high speed video transmission

A video system with a transmission speed of 622 Mbps is designed and realized by taking the high speed characteristic of wireless laser communication. Functions of the system such as video converting, data processing and buffering, laser transmitting/receiving are implemented on a single circuit board to achieve a better flexibility. The ping-pong operation which is made up of internal asynchronous FIFO(First in First out) is utilized to effectively switch the continuous video data flow. Manchester code is employed to obtain better recoveries of data and clocks from the received signals. Moreover, it is also easier to detect the byte boundary from serialized data flow and to synchronize the communication. Experimental results show that the system can transmit video signals stably and meet the application need in the under ground distance, and the system provides a platform for further research on laser communication technologies.