| 摘要 |
The present invention relates to a method for manufacturing a primary preform for optical fibres using an internal vapour deposition process, comprising the steps of:
i) providing a hollow glass substrate tube having a supply side and a discharge side,
ii) surrounding at least part of the hollow glass substrate tube by a furnace set at a temperature T0,
iii) supplying doped or undoped glass-forming gases to the interior of the hollow glass substrate tube via the supply side thereof
iv) creating a reaction zone with conditions such that deposition of glass on the inner surface of the hollow glass substrate tube will take place, and
v) moving the reaction zone back and forth along the length of the hollow glass substrate tube between a reversal point located near the supply side and a reversal point located near the discharge side of the hollow substrate tube so as to form at least one preform layer on the inner surface of the hollow glass substrate tube, which at least one preform layer comprises several glass layers. |
