Patent ID: 9658393
Date: 2017-05-23
CPC Classifications: C03B,G02B,Y02P

Claim:
1. A method for fabricating a birefringent hollow core fiber comprising the steps of: arranging a plurality of capillary tubes into a preform assembly; providing a core gap in the matrix, wherein the core gap spans a plurality of tubes and has a boundary defined by the interface of the core gap with the remaining assembly, wherein the matrix comprises wherein the capillary tubes at the core gap boundary include lattice capillary tubes and defect capillary tubes that are arranged in a pattern defining two orthogonal axes of reflection symmetry in a hollow core fiber drawn from the preform assembly; and drawing the preform assembly into a fiber, wherein the assembly fuses together to form a hollow core corresponding to the core gap and a microstructured cladding having individual cells corresponding to individual capillary tubes in the preform assembly, wherein the defect capillary tubes are selected to have a difference in cross sectional solid area compared with that of the lattice capillary tubes.