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Rayleigh scattering reduction method for silica-based optical fiber

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3 Author(s)
Tsujikawa, K. ; NTT Access Network Service Syst. Lab., Ibaraki, Japan ; Tajima, K. ; Ohashi, M.

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 1800 /spl deg/C 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/sub 2/ doped silica core single-mode fiber with a minimum loss of 0.16 dB/km at 1.55 /spl mu/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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Lightwave Technology, Journal of  (Volume:18 ,  Issue: 11 )