Design And Study Of 30-Channel Opto-Electronic Tranceiver

With the development of information technology, our society is entering information society. Optical-fiber communication system is the principal part of modern information super-highway for its merits such as great capacity, long transmit distance, good anti-interference performance etc. The design for hardware is convenient just as designing the software, for appearance of FPGA and VHDL/Verilog-HDL. The architecture and working of FPGA can be reprogrammable.The paper designed a 30-channel optoelectronic integrated client machine, which is able to transmit 30 channels of voice signal. The system adopts a design scheme based on FPGA, The acquisition circuit of the voice signal and the A/D conversion circuit and D/A conversion circuit adopt PBL38710 from Ericsson company and the chip of TP3067 from NATIONAL SEMICONDUCTOR. The TDM (Time-Division Multiplexing) module and line code/decode module are implemented on FPGA. The photo-electric conversion and the electric-photo conversion are implemented by optic transceiver module..The system adopts 5B6B line code, and the code/decode module is designed on FPGA. The frame synchronization and the the bit synchronization is realized by digital phase locked loop. The FPGA modules are simulated under Quartusll and Modelsim environment and in the end, the whole debugging and testing of system is done using CycloneⅢEP3C25Q240C8 starter kit board.By implementing the TDMA module and the code/decode module on FPGA, the system processing speed is improved greatly with the advantage of FPGA parallel processing, and the system have many characteristics such as high processing speed, high integrated level and strong anti-jamming ability.