Optical fibres with special bending and dispersion properties
US6856742B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2001 |
| Grant date | Feb 15, 2005 |
| Priority date | — |
| Expiry date | Nov 12, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0239
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A microstructured optical fiber having a specially designed cladding to provide single mode waveguidance and low sensitivity to bending losses. In one aspect the optical fiber has an inner and an outer cladding each comprising elongated features. The inner cladding features have normalized dimensions in the range from 0.35 to 0.50 and the outer cladding features have normalized dimensions in the range from 0.5 to 0.9, where the normalization factor is a typical feature spacing. The fiber is further characterized by a feature spacing of the inner cladding larger than 2.0 micron. In a second aspect, the fiber has a special non-circular and non-equilateral-polygonial outer cross-sectional shape to mechanically ensure bending in predetermined directions that are favourable with respect to low bending losses. The present invention provides fibers, which are less sensitive to macro-bending losses than presently known single-mode fibers with similar sized mode areas, and provides robust, single-mode, large-mode area fibers for long-distance optical transmission and fibers with special dispersion properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.