Manufacture of optical fibre preforms
US4417911A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1982 |
| Grant date | Nov 29, 1983 |
| Priority date | — |
| Expiry date | Feb 23, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2207/46
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In the manufacture of a glass optical fibre preform by forming a coating of oxide material on the interior surface of a substrate tube, in particular a coating of silica and one or more dopant oxides on a vitreous silica tube, by causing a reaction to take place between oxygen and the vapor or vapors of one or more compounds such as halides, the reactant vapors are introduced into a perforated tube supported coaxially within the heated substrate tube and pass through the perforations into the annular space between the perforated and substrate tubes, while oxygen, and optionally an additional carrier gas, is passed either into the perforated tube or directly into said space. The coating-forming reaction is caused to take place in said space by generating energy in the space, in the form of a plasma, or a laser beam, and/or heat, and/or gas combustion, whereby the coating is formed simultaneously on the whole heated length of the substrate tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.