Glass optical fibres and glass compositions therefor

Details Glass optical fibres and glass compositions therefor Glass optical fibres and glass compositions therefor

C - Chemistry, Metallurgy

03

C

261/18

C03C 13/00 (2006.01) C03C 3/064 (2006.01) C03C 3/089 (2006.01) C03C 13/04 (2006.01)

Patent

CA 1149827

ABSTRACT "GLASS OPTICAL FIBRES AND GLASS COMPOSITIONS THEREFOR" A glass suitable for use as the core glass in a high numerical aperture optical fibre has a composition calculated by taking a notional soda-boro-silicate glass having the following composition range: soda 15-25 mol %, boric oxide 0-20 mol %, silica 25-65 mol %; and substituting up to 12 mol % of boric oxide by barium oxide, and up to 42 mol % of silica by germania. The glass can be prepared by controlling the partial oxygen pressure of the melt so that it is approximately 10-5 atmospheres. An optical fibre can be produced, by using a soda-boro silicate clad glass, and a core glass having the composition in the above range.

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