Patent ID: 7657141
Filing Date: 2010-02-02
Classification: G02B

Abstract:
1. A photonic bandgap fiber, comprising: a hollow core formed along a center axis of the photonic bandgap fiber, through which a light propagates; and a cladding region made of silica glass, the cladding region including air holes forming a triangular lattice arranged around the hollow core, wherein a lattice constant Λ of the triangular lattice of the air holes is equal to or smaller than 1.05 micrometers, the fiber is configured to have a confinement loss for the light that is less than a scattering loss, and the light has a predetermined wavelength range which includes a center wavelength of a photonic bandgap, the center wavelength is 0.4 micrometers, a ratio d/Λ equal to or larger than 0.9 and the ratio d/Λ is equal to or smaller than 0.97, and d is a hole diameter of the air holes.