Method of manufacturing preforms for optical fibres having low water peak
US9416045B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2012 |
| Grant date | Aug 16, 2016 |
| Priority date | — |
| Expiry date | Dec 28, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/02
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of manufacturing an optical fibre preform comprising: providing a glass core rod comprising a central core region of radius a and an inner clad region of external radius b to define a first core-to-clad ratio a/b; forming an intermediate glass preform comprising an intermediate clad region surrounding the inner clad region of the glass rod and having an external radius c to define a second core-to-clad ratio a/c, and overcladding the intermediate glass preform by forming an overclad region surrounding the intermediate clad region to form an optical fibre preform, wherein the first core-to-clad ratio a/b is equal to or less than 0.40 and the second core-to-clad ratio a/c is of from 0.20 to 0.25.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.