METHOD OF PRODUCING PREFORMS FOR DRAWING OPTICAL FIBRES AND APPARATUS FOR THE CONTINUOUS PRODUCTION OF OPTICAL FIBRES

摘要

The method consists in depositing, by means of a non-isothermal plasma activated C.V.D. process, core glass (8) and cladding glass (6) onto a starting member which is moved from the deposition chamber (20) at a rate which is the same as the growth rate. An arrangement for drawing fibres shows that at one end a preform (8/6) for drawing an optical fibre of the stepped-index type is being formed while at the other end this preform (8/6) is drawn into a fibre. The plasma is generated by means of a microwave cavity (29) which is connected to a microwave generator (31).