Optical fiber preform and method for manufacturing such optical fiber preform from a primary preform
US11046608B2 · kind B2 · utility
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3Claims
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Key dates
| Filing date | Aug 13, 2013 |
| Grant date | Jun 29, 2021 |
| Priority date | — |
| Expiry date | Oct 22, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C2201/50
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to an optical fiber preform (20) comprising a primary preform (21) and one or more purified silica-based overclad layers (22) surrounding said primary preform (21), the purified silica-based overclad layers (22) comprising lithium and aluminium, and having a ratio between lithium concentration [Li] and aluminium concentration [Al] satisfying the following inequality: 1×10−3≤[Li]/[Al]≤20×10−3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.