Abstract: An elongate waveguide for guiding light includes a core having an elongate region of relatively low refractive index; a microstructured region around the core having 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, at least one relatively enlarged region around the boundary (and excluding a boundary having twelve nodes and six enlarged regions substantially at a mid-point between six pairs of relatively more-widely-spaced apart neighboring nodes).
Type:
Grant
Filed:
June 20, 2005
Date of Patent:
January 22, 2008
Assignee:
Crystal Fibre A/S
Inventors:
David Philip Williams, Timothy Adam Birks, Philip St. John Russell, Peter John Roberts, Hendrik Sabert, Alexander Onischenko