Rare earth element-doped multiple-core optical fiber and method for fabricating the same
US5712941A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 4, 1996 |
| Grant date | Jan 27, 1998 |
| Priority date | — |
| Expiry date | Jun 4, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/06729
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A rare earth element-doped multiple-core optical fiber has an outer cladding layer and a plurality of cores each covered with a primary cladding layer. The cores are positioned substantially on a central axis of the outer cladding layer and separated with a predetermined spacing S from each other by the primary cladding layer. The outer cladding layers are made of SiO.sub.2, or SiO.sub.2 added with a dopant like F, Ge, etc. The primary cladding layer is made of SiO.sub.2 doped with Er, or SiO.sub.2 doped with Er and F together and formed to have a predetermined thickness of 1.0 .mu.m.about.1.5 .mu.m to form the predetermined spacing S. The Soot glass rods for cores and primary cladding layers are immersed in an Er-compound solution, then picked up, dried and consolidated to form Er--Al co-doped SiO.sub.2 --GeO.sub.2 transparent glass rods. The glass rods are inserted into a quartz tube and collapsed by heat to fabricate an optical fiber preform rod, then heated to be drawn to provide an Er-doped multiple-core optical fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.