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:
Apr. 11, 2006
Filed:
Nov. 05, 2003
Greg Parker, Hampshire, GB;
Martin Charlton, Southampton, GB;
Majd Zoorob, Southampton, GB;
Mesophotonics Limited, Southampton, GB;
Abstract
An optical waveguide structure according to the invention comprises a core layer having a first refractive index n, an array of sub-regions within the core having a second refractive index n, the array of sub-regions giving rise to a photonic band structure within the core layer, and a cladding layer adjacent to the core layer having a refractive index n, wherein: n>n[[∃]]≧nand n−n>0.1. The structure of the present invention is less lossy than prior waveguide structures having photonic band structure regions. The out of plane divergence of light in the sub-regions is reduced as compared with air holes which are typically used in photonic crystal structures. As a result more light is coupled back into the core at the sub-region/core interface. Coupling of light into the buffer layer is also reduced. Furthermore, there are added advantages over the prior art associated with the fabrication of these structures.