The high-temperature stability of fiber Bragg gratings fabricated by 193 nm excimer laser

We have demonstrated the fiber Bragg gratings (FBG) fabricated on different fibres by using the excimer laser (193 nm) and phase mask. The FBG is annealed at 400 °C for 70 days. The wavelength shift of FBG at 400 °C has been investigated. After the FBG is annealed for a long time, the wavelength shift of the FBG approaches stability. Then, the relationship between wavelength shift of FBG and annealing time has been obtained.