The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 28, 2010
Filed:
Jun. 21, 2004
David Philip Williams, Bath, GB;
Timothy Adam Birks, Bath, GB;
Hendrik Sabert, London, GB;
NKT Photonics A/S, Birkerod, DK;
Abstract
A birefringent elongate waveguide for guiding light, comprises: a core region (), comprising an elongate region of relatively low refractive index; and a cladding region (), comprising elongate regions () of relatively low refractive index interspersed with elongate regions () of relatively high refractive index. In a transverse cross-section of the waveguide, a (5) relatively high refractive index boundary region () is provided that surrounds the core region and has either (1) at most two-fold rotational symmetry or (2) a rotational symmetry that reduces the rotational symmetry of the waveguide to at most two-fold rotational symmetry. The symmetry of the boundary region () results at least in part from azimuthal variations therein, which are substantially uncharacteristic of the cladding region ().