摘要

A novel fabrication method for thermal regenerated fiber Bragg grating (RFBG) with intensity larger than 43% (reflective to the original FBG) was developed. Conventional seed fiber Bragg grating (SFBG) was erased at 800 degrees C. The sample was continuously heated to 900 degrees C, during which RFBG occurred. The as-prepared RFBG was taken for thermal annealing cycles (18 degrees C-1000 degrees C) to study its wavelength shift characteristics. At the beginning of the test, the wavelength was unstable and inclined to increase 148 pm. After four cycles, the wavelength reached a stable value. Temperature sensing experiment at 18 degrees C-1000 degrees C was carried out for RFBG and a sensitivity of (11.07 + 0.00781T) pm/ degrees C with a satisfactory stability was obtained. The developed RFBG could be applied to high temperature detection in aerospace industries.