Optical fiber fundamental mode field expander

Details Optical fiber fundamental mode field expander Optical fiber fundamental mode field expander

G - Physics

02

B

G02B 6/24 (2006.01) G02B 6/02 (2006.01) G02B 6/255 (2006.01)

Patent

CA 2641193

A device for providing an expanded mode field from a single mode optical waveguide is formed by fusing a length of single mode optical fiber with a length of fiber rod absent a cladding and adiabatically tapering the fused region. The length of single mode fiber has a core having a refractive index n co and a cladding having a refractive index n cl, wherein n cl < n, and wherein the cladding has an outer diameter .rho.. The length of fiber rod absent the cladding has a refractive index of the fiber rod is substantially the same as the cladding index n cl of the single mode optical fiber. The outer diameter of the length of fiber rod is .rho., the same as the cladding diameter of the single mode fiber.

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