Experimental results and a discussion on the formation and decay of oxygen-modulated chemical-composition gratings in a standard telecommunication fiber are presented. Comparison between the decay experiment and the model provides a diffusion coefficient with an activation energy of 490 kJ/mol, which is in close agreement with reported values of oxygen self-diffusion in silica. The gratings have a diffusion-controlled decay behavior, with more than 50% of the reflectivity remaining after 7.5 h at a temperature of 1230°C. The gratings show higher thermal stability when heated in air than in an inert argon atmosphere.
© 2004 Optical Society of America
(050.2770) Diffraction and gratings : Gratings
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(160.2750) Materials : Glass and other amorphous materials
Michael Fokine*, "Thermal stability of oxygen-modulated chemical-composition gratings in standard telecommunication fiber," Opt. Lett. 29, 1185-1187 (2004)