A model based on diffusion of dopants in a periodic structure has been applied to describe thermal decay of chemical composition gratings in fluorine–germanium-doped silica fibers. The good agreement between previously reported values and the diffusion coefficients derived here from experiments and models in the 1000–1200 °C temperature range indicate that fluorine diffusion is the main mechanism of grating decay. Experimental results also indicate that the presence of phosphorous significantly increases the decay rate of chemical composition gratings.
© 2002 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 chemical composition gratings in fluorine-germanium-doped silica fibers," Opt. Lett. 27, 1016-1018 (2002)