Fig. 1. The structure of the intensity demodulation system

Fig. 2. The transmission structure of the FBG

Fig. 3. The schematic structure of TDM demodulation system

Fig. 4. The structure of Sagnac filter

Fig. 5. The transmission spectrum of Sagnac filter with length of 4 m

Fig. 6. The real-time denoising results of three different wavelet functions

Fig. 7. The filtering results of different wavelet levels

Fig. 8. The filtering results of different threshold methods

Fig. 9. The real-time demodulation result of the DAQ