GLASS OPTICAL FIBRES AND GLASS COMPOSITIONS THEREFOR

摘要

"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.