Method of making glass optical fiber
US4453961A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1982 |
| Grant date | Jun 12, 1984 |
| Priority date | — |
| Expiry date | Jul 26, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2203/20
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A glass optical waveguide preform is formed by depositing first and second coatings of glass soot on a mandrel. The characteristics of the first coating are such that it can ultimately form the core of an optical fiber. The core-clad diameter ratio of the preform is greater than that necessary to provide the desired core-clad diameter ratio of the resultant fiber. The mandrel is removed and the porous preform is consolidated. The preform aperture is etched, rinsed and dried. One end of the preform is heated and pinched to close the aperture. The aperture is evacuated, and the remaining end of the preform is heated, the corresponding end of the aperture being caused to close. An intermediate fiber is drawn from the resultant consolidated preform, the entire aperture being closed during drawing due to the low pressure within the aperture. The intermediate fiber is severed into sections, each of which functions as a mandrel for the deposition of a further coating of cladding soot. The resultant composite article is consolidated and drawn into an optical fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.