Design And Implementation Of Optical Transceiver Based On FPGA

In recent years, the security supervisory control plays a more and more important role in people's daily life. We need Video optical transceiver in the following areas:from industry production,exprssway,bank and port to residential surveillance and road monitoring in people's daily life. The Digital optical transceiver in this designed thesis adopts the scheme of FPGA+ASIC to achieve the compression transmission of One channel unidirectional video signal, One channel two-way video signal and One channel reverse yuntai data control signals. This Digital optical transceiver is divided into transmitting terminal and receiving terminal. The main function of transmitting terminal is sending video,audio and receiving the contral signal that is from distal yuntai control; The main function of receiving terminal is receiving the signal of video and audio that come from transmitting terminal and sending the signal of Yuntai control at the same time. This Digital optical transceiver can make the NTSC,PAL and SECAM fully coexist.This thesis introduces the hardware composition and software design of Digital optical transceiver's transmitting terminal and receiving terminal separately. The hardware section mainly present video capture and optical Receiver Module, audio capture and Receiver Module, data sending and Receiver Module, Photoelectric electro-optic conversion Module and Core FPGA processing module. The design of this thesis mainly adopt integrated chip,to reduce costing, increase stability of the systerm. It's also convenient to test and debug the production meanwhile. Core processing module adopt FPGA chip,because of its convenient programming, low cost and flexible interface. And it's purpose is that use simple hardware circuit to achieve complex system requirements. Thus the interface technology of photoelectric electro-optic conversion module adopts LVDS, so as to realize high speed and high quality transmission.The software section makes fully use of FPGA's flexble programming function. The vedio signal and audio signal at the transmitting terminal get though the time-division multiplexing dispose of core FPGA processing moudle, to form a group of data that is spreaded by frame to receiving terminal. Then the receiving terminal sends the data to each moudle by demultiplexing and each moudle output the data next. Though the direction data transmission process is opposite. On the one hand the receiving terminal changes the data of yuntai control and the derection of audio data into frame data, then sends the optical signal by Photoelectric conversion. On the other hand the transmitting terminal receives the reverse direction control data and audio data. Bouth the positive signal and reverse signal transfer by single fiber and the photoelectric electro-optic signal adopt the technology of Wavelength Division Multiplexing(WDM).In the end this thesis introduce the problems that emerged in the debugging process of the hardware and software and the deficiencies of this thesis in detail in order to provide good foundation to the next phase that connect to more complex digital optical transceiver.