METHOD FOR MAKING OPTICAL FIBRES

摘要

1. A method of manufacturing light-conducting fibres, in which layers of glass are deposited on the inner wall of a glass tube heated at a temperature between 1 100 and 1 300 degrees C by passing a reactive gas mixture from a gas inlet side through the glass tube at a pressure between 1 and 20 hPa while in the interior of the glass tube a plasma is reciprocated strokewise between two reversal points, the glass tube being collapsed to form a solid preform from which optical fibres are drawn after a quantity of glass has been deposited corresponding to the intended optical fibre construction, characterized in that the reciprocating movement of the plasma is interrupted at the reversal point on the gas inlet side, the duration of said interruption being proportioned so as to be sufficient for an effective reduction of entrance taper losses.