Heat treatment with the presence of hydrogen (H_(2)) that react with GeE0 centers (·Ge ?) at high temperature will weaken the refractive index modulation of grating fabricated in hydrogen-loaded normal germanosilicate fiber. Pre-annealing treatment of the above fiber was demonstrated to be able to enhance the grating's thermal stability effectively. 0.37-nm blue-shift of the reflected Bragg wavelength was observed.
© 2005 Chinese Optics Letters
(050.2770) Diffraction and gratings : Gratings
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2340) Fiber optics and optical communications : Fiber optics components
(230.1480) Optical devices : Bragg reflectors
(350.2770) Other areas of optics : Gratings
Youlong Yu and Hwayaw Tam, "A technique for enhancing the thermal stability of hydrogen-loaded fiber Bragg grating," Chin. Opt. Lett. 1, 256-258 (2003)