Optical fiber preform manufacturing method for shrinkage and closing of deposited tube
US6840063B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2002 |
| Grant date | Jan 11, 2005 |
| Priority date | — |
| Expiry date | Jun 21, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B37/01869
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An optical fiber preform manufacturing method whereby a clad layer and core layer are deposited on the inner surface of a preform tube for forming a deposited tube. One end of the deposited tube is shrunk and closed. The deposited tube which has a closed end is arranged extending vertically through a circular heater. A heat is applied to the deposited tube at a temperature lower than the softening point of a deposited tube, exhausting contaminants existing in the interior of the deposited tube while moving the circular heater. The heating temperature of the circular heater is then set to a temperature not lower than the softening point of the deposited tube-to shrink and close the deposited tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.