. . . . . . . . . "1973" . . . "Preparation of low loss glasses for optical fibre communication systems"@en . . . "Abstract. A technique is described for melting high purity glasses in which heat is generated within the glass by R.F. induction. Losses at c. 1060 nm were less than 50 dB Km\u22121 Multimode fibres have been made from those materials with little increase in loss resulting from the fibre drawing process."@en . "BF02057127" .