Hydrogen Loading and Photolytic Index Changes in Germanosilicate Fiber

In this paper, UV photosensitivity of a hydrogen-loaded germanosilicate fiber and the relation between photosensitivity and the hydrogen-loading condition were studied experimentally. Experimental results indicate that: ① the curve of refractive index changes in the hydrogenloaded fibers is exponential type (△n = 3.3×10-4t0.31689), at a certain point, refractive index changes reach saturated. This power law accords with the model proposed by Patrick H. However, the refractive index changes of the hydrogen-loading fibers continue to increase when exposed time prolongs;②the photosensitivity changes are exponential to hydrogen-loading time until they reach saturated;③ the photosensitivity changes are proportional to the hydrogen-loading pressure.