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Ultraviolet photolytic-induced changes in optical fibers: the thermal expansion coefficient.

We show that recent experimental results of Wong et al. [Opt. Lett. 17, 1773 (1992)] on the effect of UV photolytic processing on the birefringence of elliptical-core fibers arise from a 15-30% reduction of the coefficient of thermal expansion of the germanosilicate core. An explanation based on reconfiguration of the glass network to minimize the stress energy during UV processing is proposed.