| 摘要 |
PURPOSE:To obtain an image fiber having a low transmission loss by incorporating TiO2 as a dopant into glass to constitute cores and incorporating >=1,000ppm hydroxyl group therein. CONSTITUTION:A clad 1 consists of pure silica and the many cores 2... are dispersed in the clad 1. Each core is formed to about 2-4mum diameter. A jacket 3 consisting of the pure silica is provided around the clad 1 and further, a protective film 4 consisting of a modified silicone resin or the like is provided on the outside circumference thereof. The cores 2 consist of the silica glass which is added with at least TiO2 as the dopant and in which the OH group is incorporated at >=1,000ppm by weight, more preferably SiO2, TiO2, GeO2, and the melt viscosity thereof has the value of 80-120% of the melt viscosity of the pure silica. The silica glass in the range of TiO2:GeO2: SiO2=5-20:10-20:60-85 by molar ratio is thereby obtd. and the melt viscosity having the value of 80-120% of the melt viscosity of the silica is obtd.
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