Method for producing glass preform for optical fiber
US5055121A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1990 |
| Grant date | Oct 8, 1991 |
| Priority date | — |
| Expiry date | Jul 27, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S65/90
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An optical fiberglass preform having fluorine selectively added to its cladding is produced by: PA1 depositing soot of quartz glass on a pipe from starting member by using burners for synthesizing glass soot to form a porous glass preform consisting of a core porous glass body a peripheral portion of which has a larger bulk density than the other portion and a cladding porous glass body, PA1 heating said porous glass preform in a dehydration atmosphere while supplying dehydration gas through the pipe form starting member and PA1 heating and vitrifying the dehydrated porous glass preform in an atmosphere containing a fluorine-containing compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.