Fig. 1. (a) Thermal regeneration of fiber Bragg grating and high temperature reflectance

Fig. 2. (a) Evolution of temperature and grating reflection intensity with time during thermal regeneration; (b) FBG and RFBG reflection and transmission spectra prepared

Fig. 3. (a) Measurement of RFBG by cyclic heating at 150~1 050 ℃; (b) RFBG 150~1 050 ℃ temperature test

Fig. 4. RFBG center wavelength stability test