Method for depositing a coating layer on an optical fiber while it is being drawn and device for its implementation
US6475620B1 · kind B1 · utility
4Cited by
1References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2000 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Feb 4, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2964
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for the deposition of a coating layer on an optical fiber while it is being drawn. The coating layer is designed to reduce the permeability of the optical fiber to water vapor and therefore to increase its lifetime. The method is characterized in that it consists in carrying out a decomposition of a gas mixture of boron halogenide and hydrogen and/or boron halogenide and ammonia gas by a microwave plasma-assisted addition of energy and in that the operation is conducted in the presence of a carrier gas in order firstly to carry the gas mixture to a reaction medium and secondly to activate the plasma.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.