| 摘要 |
PURPOSE:To obtain the glass fiber of superior heat resistance which does not cause any transmission loss by providing the specified first covering layer having a refractive index higher than that of the outermost layer to the glass fiber for optical transmission and the specified second covering layer thereon. CONSTITUTION:An optical fiber 1 has the first covering layer 5 which consists of the silicone resin composed primarily of curable organopolysiloxane containing phenyl groups and the second covering layer 6 which is composed of the silicone resin of the kind similar to that of 5. Or it has the second covering layer 7 which is composed of the silicone resin filled with one or more kinds of fillers such as fumed silica, precipitate silica, aluminum silica, quartz powder, molten quartz powder, diatomaceous earth, calcium carbonate, titanium dioxide and carbon black, in place of the above-mentioned 6. |
