Hermetic coating for an optical fiber
US4592932A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1984 |
| Grant date | Jun 3, 1986 |
| Priority date | — |
| Expiry date | Jun 26, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D21/10
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An optical fiber which has just been drawn from an optical preform is provided with two external hermetic coatings. The primary coating is a metallic coating provided by, for example, using a heterogeneous nucleation thermochemical deposition technique. This technique involves passing the fiber through a reaction zone which contains a gaseous medium that includes a reactant which decomposes, or a mixture of reactants which chemically react, at a predetermined temperature to form the material of the coating. The second coating is provided by immersing the fiber in a deposition bath containing a liquid medium which includes at least one reactant capable of deposition onto the primary coating to form a secondary coating. The deposition process may be achieved by applying a current through the medium at a predetermined temperature or by including reactants in the medium which will deposit at predetermined temperatures without applying a current. The resulting fiber may then be provided with an additional polymer coating layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.