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摘要数字光端机，一种传输的是通过数字电路控制光信号的机器，使用0、1代码来实现光通信。光纤通信利用光波来传送信息,是一种以光纤为传输介质的通信方式， 光纤通信作为一种新技术，近年来发展迅猛，在通信史上的应用的广泛也是十分罕见的，标志着是世界新技术革命以及未来信息社会各种信息的传递工具。数字视频光端机技术的改进和光纤价格的降低，使光端机在生活中得到了广泛的应用，由于视频监控系统具有直观、方便和应用广泛的特点，视频监控在实际应用中得到了很好的发展。46093
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本文分析了光纤通信系统，并在此系统中，仔细研究了数字视频光端机的发射端和接收端的设计原理，根据视频数字光端机目前在监控领域的应用范围，利用光纤通信系统来实现视频的远程传输，并在此次设计中将串并转换技术运用到数字视频光端机的研制中。综合以上的设计需求及设计要求，在这次设计中根据设计出的原理图完成硬件设计和线路编码的软件程序，最终在PCB板中实现出来。整个设计避免了模拟视频光端机所带来的弊端，具有很高的应用价值。光端机的主要包括两个部分：光发射机和光接收机。这两部分包含视频信号处理部分、控制信号处理部分，以及光模块部分，在视频信号处理部分,主要是通过A/D或D/A转换、线路编译码以及并/串(串/并)转换来实现的。其中，线路编码通过在CPLD 内VHDL编程实现。
本设计根据设计要求进行系统分析，选择合适的器件，设计出电路原理图。并对硬件做详细的分析以及软件程序的编写。
毕业论文关键词：数字视频；光端机；光纤通信；CPLD；
ABSTRACT Digital optical transceiver, a transmission control light signal by digital circuit machine, using 0 and 1 code to achieve optical communication. Optical fiber communication by using light waves to transmit information, is a kind of optical fiber as transmission medium of communication, optical fiber communication as a kind of new technology, in recent years rapid development, in the history of communication application widely is also very rare, marking the is the new technology revolution and not to a variety of information society, information transfer tools. Digital video optical transmitter and receiver technology improved and the price of fiber is reduced, so that the transmitter has been widely used in life, due to the video monitoring system is intuitive, convenient and widely used features, video surveillance in the practical application has been very good development.
Optical fiber communication system are analysed in this paper, and in this system, carefully study the remote transmission of digital video optical transmitter and receive end design principle, according to the digital video optical transmitter and receiver is currently in the field of monitoring scope of application, using optical fiber communication system to realize the video, and in the design will string and conversion technology is applied to the development of digital video optical transmitter and receiver. Above the design requirements and design requirements, in this design according to the schematic design of the hardware design and circuit coding software program, and finally realized in the PCB board. The whole design avoids the disadvantages of analog video brings, has very high application value. The transmitter consists of two parts: optical transmitter and optical receiver. The two parts contains the part of video signal processing and control signal processing part, and optical module part. In the video signal processing part, mainly through the A / D and D / a conversion circuit, encoding, decoding and the parallel / serial (on / and) to achieve the transformation. Among them, the line coding through the VHDL programming in CPLD.
Based on the design requirements，this design analyses the system, choose the appropriate device，design the schematic diagram. And to do a detailed analysis of the hardware and software programming.
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