10Gbps/40Gbps Optical Fiber Communication Technology Research And System Implementation

At present, with the rapid development of science and technology, unceasing enhancement of digital transmission technology and the increasing requirement of high bandwidth of data transmission channel, optical fiber has been widely applied in data communication because that the large amount of data transmission capacity and good secrecy makes the optical fiber communication has the advantages of high channel capacity. Photoelectric theodolite is stepping into a high speed digital direction and the digital cameras with the feature of high speed and bedding face array and high speed sensor is being used. Data communication subsystem is the important subsystem of photoelectric theodolite and could complete the high speed communication between the up sub-system and down sub-system.But the ability of existing optical fiber communication system is limited, highlight contradictions. Therefore, study and research of high-speed optical fiber communication technology and system implementation is very important.This paper combined with characteristics and needs of theodolite data transmission to improve the transmission bandwidth of data communication system. After the study of the data link transmission protocol and the existing technology, we research the10Gbps/40Gbps optical fiber communication technology and design8.5Gbps optical fiber communication system according to the network communication protocol in network interface layer model and protocol specification, which could transform image data and servo data additional information only by a piece of optical fiber transmission line. The system can match the camera with the characters up to500p/s,1280×1024resolution,8×8bit output. According to the input/output data requirements, system could complete the data acquisition and transmission for Camera and acquisition card based on full model Camera Link interface. We used Stratix IV GX series FPGA by Altera company as the core processor, customed data transmission protocol and realized data transmission from the low speed wide digits interface to the high speed narrow digits interface, configured8.5Gbps high-speed transceiver, exported LVPECL high speed differential signal and drived SFP optical transceiver module to implement light/electric and electric/light conversion. Mainly to complete the following work:1. Further researched the examples of existing10Gbps/40Gbps high-speed data transmission system design and implementation scheme. By comparing and research of each transfer protocol and the design scheme, we draw up8.5Gbps optical fiber transmission system implementation scheme and10Gbps/40Gbps optical fiber communication system design scheme.2. Completed chip selection, module selection and hardware circuit design which included FPGA minimum system (configuration circuit, clocking circuit and reset circuit), power supply circuit. Camera Link interface circuit and UART RS422circuit and light module reference circuit.3. Analyzed the unit circuit working principle and realized the software programming and debugging according to system data flow direction which included research of data sources (Camera and serial interface) data quantity and time sequence, three model configuration of Camera Link interface, internal data transmission protocols, data fusion from serial ports additional information to the video transmission and high speed Transceiver configuration simulation.