Experimental study on high temperature regeneration of fiber Bragg grating

摘要

Regeneration of fiber Bragg gating (FBG) plays an important role in applications, it can make FBG resist high temperature for a long time, thus greatly improving the performance of FBG and meeting the measurement requirements. In this paper, the details of the regeneration of FBG is investigated based on high temperature annealing technology, and the temperature sensing performance of regenerated FBG(RFBG) is studied subsequently. Experimental results show that the regeneration of FBG can be realized by means of high temperature annealing with a certain temperature setting schedule. Compared with ordinary FBG, the reflected power of the central wavelength of RFBG fluctuates little with the change of temperature. During heating and cooling, the temperature sensitivity of the RFBG is 0.01295nm/°C and 0.01286nm/°C, respectively. The difference in temperature sensitivity is small, and the linearity is greater than 0.99. It shows that RFBG has good thermal stability in the range of room temperature~ 600 °C.