Glass manufacturing – Processes – Forming product or preform from molten glass
65 182, 427163, C03B 37018
Rare earth elements, e.g. Nd, are introduced into optical glass fibre for telecommunications by evaporating a suitable salt, e.g. NdCl.sub.3, from a glass sponge into the gas stream used to deposit core material. Preferred sponges are in the form of tubes having an outer impervious layer and an inner porous layer. These sponges are conveniently made by MCVD and the impregnation is preferably carried out using an alcoholic solution of the impregnant.
patent: 3864113 (1975-02-01), Dumbaugh
patent: 4666486 (1987-05-01), Hutta
Ainslie Benjamin J.
Craig Susan P.
British Telecommunications PLC
Lindsay Robert L.
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