Fig. 1. Experimental setup of high temperature regenerated fiber Bragg gratin

Fig. 2. Experimental setup of temperature characteristic of RFBG

Fig. 3. Experiment platform for RFBG production and temperature characteristic testing system

Fig. 4. Transmittance spectra of FBG before and after the generation. (a) Air environmental atmosphere; (b) Nitrogen environmental atmosphere

Fig. 5. Changes in central wavelength and transmission depth during regeneration. (a) 1#RFBG; (b) 2#RFBG

Fig. 6. (a) 1#RFBG of wavelength repeatability experiments results; (b) 2#RFBG of wavelength repeatability experiments results

Fig. 7. (a) Wavelength fluctuations of 1#RFBG when heating up under different cycles at each temperature; (b) Wavelength fluctuations of 1#RFBG when cooling down under different cycles at each temperature

Fig. 8. (a) Wavelength fluctuations for 2#RFBG when heating up under different cycles at each temperature; (b) Wavelength fluctuations for 2#RFBG when cooling down under different cycles at each temperature

Fig. 9. Center wavelength and temperature fitting curve. (a) 1#RFBG; (b) 2#RFBG