Fiber Optic Sensing Signal Monitoring System Based on FPGA

At present, the phase monitoring method of optical fiber sensor signal cannot meet the practical application requirements of optical fiber communication. This paper proposes an optical fiber sensor signal monitoring system based on FPGA to solve the problems such as the phase adjustment accuracy of optical fiber sensor. This system takes FPGA BQR7VX690T as the core master, and uses FFT to transform the spatial frequency domain signal of the signal, so as to achieve the sampling signal processing in the frequency domain. Aiming at the phase difference of different optical fiber signals, this paper designs CORDIC algorithm to realize the frequency domain data processing. It can realize the parallel processing of four groups of signals within 1ms of system processing time, identify the phase difference of signals of 1 ° and above, and make the phase difference of output signals within 1 °, so as to achieve the effect of real-time and rapid correction of signals. The system uses DDR3 controller IP to realize DDR3 read/write control, and obtains the corrected signal in the time domain for the signal buffer delay, and communicates with the host computer through the serial port, so as to achieve the final system optical fiber sampling data waveform display phase adjustment.