Method and apparatus for producing an optical fiber preform
US4726827A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 7, 1985 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Nov 7, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B37/014
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A porous glass optical waveguide preform is formed by depositing a coating of glass particulate material on the lateral surface of a core which may be a porous glass body continuously produced by the axial deposition of glass particles. The core rotates and moves longitudinally in one direction with respect to two flame hydrolysis burners which emit streams of glass particles having different compositions. In addition, the two burners reciprocatingly move with respect to a portion of the length of the core. The speed of each burner varies as it traverses along its path of reciprocating motion. The thickness of the layer produced by a burner at a given point is inversely related to the speed of the burner as it passes that point. The layers formed by the completion of a single traverse by both burners combine to form a conically-shaped layer, the composition of which varies from the base toward the apex thereof. The conically-shaped layer, which are adjacently located longitudinally along the preform, combine to form a cylindrically-shaped portion of the preform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.