Heat-treatment of fiber Bragg grating by arc discharge
Abstract
To develop a quick and effective technology to anneal the UV inscribed fiber Bragg grating, a heat-treatment method carried out by arc discharge scanning was studied. The spectral degeneration of UV-inscribed FBG under arc discharge was investigated. It is found that the transmission spectrum intensity was reduced, the 3 dB bandwidth is narrowed and the central wavelength was blue-shifted. Increasing the number of scanning, the transmission spectrum intensity, 3 dB bandwidth and central wavelength of the FBG change slowly until finally they remain unchanged. The similar annealing process was also carried out for femtosecond laser inscribed FBG. It was found that the spectrum remains unchanging after heat-treatment. For the stable thermal property, femtosecond laser inscribed FBG was used to investigate the spectrum response of arc discharge. The discharge leads to the non-uniform temperature field on the FBG, resulting in significant chirp broadening which can be used to approximate calculate the temperature gradient on the FBG. The heat-treated method have potential applications in annealing FBG and transient high temperature measurement.
- Publication:
-
Optical Fiber Technology
- Pub Date:
- March 2019
- DOI:
- 10.1016/j.yofte.2018.12.027
- Bibcode:
- 2019OptFT..48...70X