Patent ID: 7346249
Filing Date: 2008-03-18
Classification: B29D,C03B,G02B,Y02P

Abstract:
1. An optical waveguide, comprising: a core, comprising an elongate region of relatively low refractive index; a photonic bandgap structure arranged to provide a photonic bandgap over a range of wavelengths of light, the structure, in a transverse cross section of the waveguide, surrounding the core and comprising elongate relatively low refractive index regions interspersed with elongate relatively high refractive index regions; and a relatively high refractive index boundary at the interface between the core and the photonic bandgap structure, the boundary having a thickness around the core such that, in use, light guided by the waveguide is guided in a transverse mode providing an F-factor of less than 0.23 μm