Optical waveguide

US7532798B2 · kind B2 · utility

Assignee

• CRYSTAL FIBRE A/S · DK

Inventors

• David Philip Williams · Bath, GB
• Timothy Adam Birks · Bath, GB
• Philip St. John Russell · Winchester, GB
• Peter John Roberts · Felton, GB
• Hendrik Sabert · Seevetal, DE
• Alexander Onischenko · Leatherhead, GB

Key dates

• Filing date: Nov 2, 2007
• Grant date: May 12, 2009
• Expiry date: Nov 2, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P40/57
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An elongate waveguide for guiding light including a core having an elongate region of relatively low refractive index; a microstructured region around the core comprising elongate regions of relatively low refractive index interspersed with elongate regions of relatively high refractive index; and a boundary at the interface between the core and the microstructured region, the boundary including, in the transverse cross-section, a region of relatively high refractive index, which is connected to the microstructured region at a plurality of nodes, and at least one relatively enlarged region around the boundary, the enlarged region having a major dimension and a minor dimension, wherein the length of the major dimension divided by the length of the minor dimension is more than 3.0.