Patent ID: 7551824
Filing Date: 2009-06-23
Classification: G02B

Abstract:
1. An extended triangular lattice type photonic bandgap fiber, comprising: a cladding and, a capillary core, wherein the cladding comprises a plurality of holes disposed within a silica glass portion in a longitudinal direction of the fiber and arranged in an extended triangular lattice shape; the capillary core comprises a plurality of holes arranged in a triangular lattice shape; wherein the holes in the capillary core have a smaller cross sectional area than the holes in the cladding; wherein the holes in the cladding have a hexagonal shape; wherein the cladding further comprises silica glass regions; wherein each of a plurality of holes is adjacent to two of the silica glass regions, and wherein the lengths of the sides of the plurality of holes adjacent to the silica glass regions are shorter than the lengths of the other sides of the plurality of holes.