Patent ID: 6539155
Filing Date: 2003-03-25
Classification: B29D,B82Y,C03B,G01N,G02B,H01S

Abstract:
An optical fibre with a waveguide structure having a longitudinal direction, said optical fibre comprising:a core region extending along the longitudinal direction, a cladding region extending along the longitudinal direction, said cladding region comprising an at least substantially two-dimensionally periodic structure comprising elongated elements each having a centre axis extending in the longitudinal direction of the waveguide, the elongated elements having a refractive index being lower than a refractive index of any material adjacent to the elongated elements, â€ƒthe periodic structure being, in a cross-section perpendicular to the longitudinal direction, defined by at least one unit cell, wherein, for each unit cell: any distance between centre axes of two neighbouring elongated elements does not exceed 2 &mgr;m, and the sum of all areas of all elements, which areas are comprised within a given unit cell, is larger than 0.15 times the area of that unit cell.