Regenerated fibre Bragg grating fabricated on high germanium concentration photosensitive fibre for sensing at high temperature

A Regenerated Fibre Bragg Grating (RFBG), with repeatable high temperature response between 400 °C–1200 °C, has been demonstrated using a hydrogen-loaded, highly germanium-doped, photosensitive fibre. A wavelength shifts of as much as 20 nm is attained during temperature calibration up to 1300 °C. A large temperature response of 17 pm/°C is obtained from the RFBG, with very good repeatability.

► Regenerated FBG (RFBG) with a repeatable high temperature response between 400 °C–1200 °C.
► The RFBG is developed from a hydrogen-loaded, highly-doped germanium photosensitive fibre.
► The RFBG has a wavelength shift of 20 nm at a maximum calibration temperature of 1300 °C.
► The RFBG has temperature sensitivities of between 17.0 pm/ °C to 17.4 pm/ °C.