Optical fibers with reduced splice loss and methods for making same
US7221838B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 2004 |
| Grant date | May 22, 2007 |
| Priority date | — |
| Expiry date | Feb 12, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/2551
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical fiber has a core region and a first cladding region surrounding the core. The first cladding region is doped to increase the fiber's refractive index volume. A second cladding region surrounds the first cladding region. The second cladding region is doped to reduce the fiber's cutoff wavelength, offsetting an increase in the fiber's cutoff wavelength caused by the first cladding region. An outer cladding surrounds the cutoff reduction region. In a further embodiment, the volume increasing region is doped to have a refractive index profile that is sloped to increase from the region's outer circumference towards its inner circumference. In another embodiment, the cutoff reduction region has a step refractive index profile that may have more than one section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.