In order to further improve the performance of fiber Bragg grating(FBG) demodulation system,based on FPGA logic control,the digital tunable fiber F-P filter(TFFP) demodulation technology for FBG sensing signals is put forward and realized,and the system principle and the hardware design frame are presented.Experimental results Experimental results show that the digital demodulation system can show satisfactory performance.The resolution of the calibration system is 1 pm,the dynamic measurement r...