The Optical-Fiber Transmission System Of Multiple Audio Digital Signals

Optical Fiber Communication is one of the best systems for all communications technologies to choose Because of the attenuation of unique and extremely wide band, communication capacity, and small advantages, fiber-optic. With the advance of China's modernization process, industrial and mining enterprises, the city traffic, highway and railway electrification, etc. surveillance management system has been applied beginning. In these applications, the general indicators of the requirements of video transmission is not necessarily very high, but its application bad environmental conditions. It is precisely this issue needs to adapt to this society created.In this paper, based on optical fiber communication model and the theory of TDM time-division multiplexing technology analysis, selection system design consistent with the necessary fiber-optic transceiver modules, encoding / decoding chips, analog-to-digital / digital-to-analog converter chip with field programmable gate array FPGA design System flow requirements and the software module / DAC, filters, audio power amplifier circuit, such as hardware circuits, implementation of the multi-channel digital audio signals in optical fiber transmission.The main thesis completed the following: First, the audio signal sampling, and quantify the coding and use of the FPGA to achieve a multi-channel audio signals in time division multiplexing, signal the completion of the electro-optic, photoelectric conversion to ensure that the signals in the fiber-optic transmission, At the receiving end of the signal for demultiplexing, as well as the decoding D / A converter, the final design of power amplifiers, filter circuit so as to restore the audio signal. It proved the correctness and feasibility.