Hole arranged photonic crystal fiber for low loss, tight fiber bending applications
US8295667B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 2008 |
| Grant date | Oct 23, 2012 |
| Priority date | — |
| Expiry date | Jan 12, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A microstructured fiber or photonic crystal fiber is described having a doped solid core region and a cladding region, holes being provided in the cladding region, the fiber having a low hybrid splice loss to conventional fiber as well as being able to be tightly bent due to the microstructured cladding. The cladding region can contain a plurality of holes surrounding and distanced from the core. These holes are preferably located symmetrically around the core and extend longitudinally along the length of fiber. The holes may be two or more D-shaped holes or truncated D-shaped holes arranged symmetrically around the care. In other embodiments, the holes comprise hole structures arranged symmetrically around the core in a ring. The holes may be arranged having the inner side facing the core formed from arcs of a circle, e.g. equal arcs of a circle. Between the arcs circular holes may be provided called capillaries, i.e. smaller holes. According to the present invention, any number of holes may surround the core, preferably three or more. The fiber has low loss at small bending radii.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.