METHOD AND DEVICE FOR MANUFACTURING OPTICAL PREFORMS, AS WELL AS THE OPTICAL FIBRES OBTAINED THEREWITH

摘要

The present invention relates to a method and a device for manufacturing optical preforms, in which one or more layers of glass, doped or undoped, are deposited onto the internal surface of a hollow substrate tube, which deposition is effected by supplying one or more reactive gas mixtures of glass-forming compounds tot the interior of the hollow substrate tube and subsequently generating a non-isothermal plasma in the hollow substrate tube, after which the preform is subjected to a contraction process for the purpose of forming a massive rod, from which optical fibres are drawn.