The effect of the thermal treatment of silica-based glasses and glass fibers on their Rayleigh scattering is investigated experimentally. The Rayleigh scattering coefficients of bulk glasses are found to be increased 5-10% by heating them to 1800C because the density fluctuation is in proportion to their fictive temperature. Based on these results, we propose a method for reducing the Rayleigh scattering losses of silica-based optical fibers by drawing them slowly at low temperatures. We used this method to obtain a GeO 2 doped silica core single-mode fiber with a minimum loss of 0.16 dB/km at 1.55 m. As a result, we confirmed that the reduction in the fictive temperature of silica-based glasses and glass fibers reduces their Rayleigh scattering.


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  1. S. Sakaguchi and S. Todoroki, "Rayleigh scattering of silica core optical fiber after heat treatment", Appl. Opt., vol. 37, pp. 7708 -7711, 1998.

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