Manufacture of optical fibre preforms
US4715875A · kind A · utility
7Cited by
5References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 26, 1986 |
| Grant date | Dec 29, 1987 |
| Priority date | — |
| Expiry date | Mar 26, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B37/018
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Manufacture of optical fibre preforms. A material such as Si, Ge and B.sub.2 O.sub.3 is evaporated in vacuo into a silica tube and is made to condense therein as a viscous liquid which is then oxidized. The operation may be repeated several times with different materials. In this way the tube is clad from within in such a way that the optical index of refraction increases from the periphery inwards. Upon completion of the cladding the tube is collapsed into a rod which is then used for drawing optical fibres.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.