Effects of glass preparation on the surface corrosion of fused silica optical fibers

The effects of glass preparation on the surface corrosion of fused silica optical fibers was studied by aging different fibers in both deionized water and tap water at 80-85 degrees C for several months and then analyzing the surface morphology of the samples using atomic force and scanning electron microscopies. We observed that surface corrosion, which causes strength degradation, is related to preparation defects in the glass, these include the existence of glass particles and layers, the presence of impurities and point defects, and in general all locations at which the bond strength is less than that of the Si- O bonds of silica. We found fibers whose surface did not become rough, despite the presence of a corrosive coating. we also find fibers whose surface roughness remained constant during aging in water, due at least in part to the protection provided by the coating. These findings imply that the effects of the glass preparation on the surface corrosion can be minimized through careful attention to the glass and to the fiber manufacturing processes.