Frame synchronization detection in optical fiber communication system based on FPGA digital multiplexing of the theodolite

To realize the synchronous multiplexing/de-multiplexing of the low-speed digital optical fiber communication system,we put forward a frame synchronization signal detecting scheme based on FPGA.The frame head is constructed by a 7 bit Bark code of 1110010.The clock signal is picked up from multiplexing data at the data receiving end,and the synchronous signal is detected for supplying the start signal for the digital de-multiplexing.Experiments show that this method can implement the frame synchronization head detection,and thus realize the correct de-multiplexing of the digital signals.