Method and apparatus for making optical fiber waveguides
US4310340A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 24, 1980 |
| Grant date | Jan 12, 1982 |
| Priority date | — |
| Expiry date | Jul 24, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B37/01807
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A glass optical waveguide preform is prepared by chemical reaction of vapor ingredients within a bait tube. As the reactants flow through the bait tube, a hot zone traverses the tube to cause the deposition of soot in a section of the tube just downstream of the hot zone. An axially disposed tubular burner, which is located just upstream from the hot zone, is mechanically coupled to the burner which generates the hot zone. The burner generates an axial water-free flame that extends through the hot zone. The flame creates a mandrel which confines the flow of reactants to an annular channel adjacent the bait tube wall in the hot zone. The flame also extends downstream from the hot zone where it increases the thermal gradient between the axis and the wall of the bait tube, thereby enhancing the thermophoresis effect, whereby deposition rate and efficiency are improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.