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AssigneeCrystal Fibre A/S
InventorsJes Broeng, Anders Bjarklev, Stig Eigil barkou Libori, Jacob Riis Folkenberg, Guillaume Vienne
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An article comprising an optical fiber, the fiber comprising at least one core surrounded by a first outer cladding region, the first outer cladding region being surrounded by a second outer cladding region, the first outer cladding region in the cross-section comprising a number of first outer cladding features having a lower refractive index than any material surrounding the first outer cladding features, wherein for a plurality of said first outer cladding features, the minimum distance between two nearest neighboring first outer cladding features is smaller than 1.0 μm or smaller than an optical wavelength of light guided through the fiber when in use; a method of its production, and use thereof.
An article comprising an optical fibre, the fibre comprising at least one core surrounded by a first outer cladding region, the first outer cladding region being surrounded by a second outer cladding region, the first outer cladding region in the cross-section comprising a number of first outer cladding features having a lower refractive index than any material surrounding the first outer cladding features, wherein for a plurality of said first outer cladding features, the minimum distance between two nearest neighbouring first outer cladding features is smaller than 1.0 μm or smaller than an optical wavelength of light guided through the fibre when in use.
An article comprising an optical fibre, the fibre comprising a number of cores with a plurality of said number of cores each being surrounded by a corresponding first outer cladding region, the cores and the first outer cladding regions being surrounded by a second outer cladding region, each of the first outer cladding regions in the cross-section comprising a number of first outer cladding features having a lower refractive index than any material surrounding the first outer cladding features, wherein for a plurality of the first outer cladding features of each of said first outer cladding regions, the minimum distance between two nearest neighbouring first outer cladding features is smaller than 1.0 μm or smaller than an optical wavelength of light guided through the fibre when in use.
An article according to any of the preceding claims, wherein for a plurality of said first and/or third outer cladding features the minimum distance between two nearest neighbouring outer cladding features is smaller than 0.5 μm.
An article according to any of the preceding claims, wherein for a plurality of said first and/or third outer cladding features the minimum distance between two nearest neighbouring outer cladding features is smaller than 0.4 μm.
An article according to any of the preceding claims, wherein for a plurality of said first and/or third outer cladding features the minimum distance between two nearest neighbouring outer cladding features is smaller than 0.3 μm.
An article according to any of the preceding claims, wherein for a plurality of said first and/or third outer cladding features the minimum distance between two nearest neighbouring outer cladding features is smaller than 0.2 μm.
An article according to any of the preceding claims, wherein for one or more first outer cladding regions the first outer cladding features occupy 45% or more of the cross-sectional area of the first outer cladding region.
An article according to any of the preceding claims, wherein the first outer cladding features are placed in a non-circular symmetric manner.
An article according to any of the preceding claims, wherein the first outer cladding region in the cross section has a substantially hexagonal like shape.
An article according to any of the preceding claims, wherein first outer cladding features of different size are present.
An article according to any of the preceding claims, wherein the first and/or third outer cladding features and/or the inner cladding features are voids.
An article according to any of the preceding claims, wherein the first and/or third outer cladding features and/or the inner cladding features are filled with vacuum, air, a gas, a liquid or a polymer or a combination thereof.
An article according to any of the preceding claims, wherein the core(s) comprises/comprise at least one member of the group consisting of Ge, Al, P, Sn and B.
An article according to any of the preceding claims, wherein the core(s) comprises/comprise at least one rare earth, such as Er, Yb, Nd, La, Ho, Dy and/or Tm.
An article according to any of the preceding claims, wherein the fibre comprises a background material being silica, chalcogenide, or another type of glass.
An article according to any of the preceding claims, wherein said optical fibre in the cross-section has a non-uniform shape of the inner cladding region along the fibre length.
An article according to any of the preceding claims, wherein the first and/or third outer cladding features are periodically distributed.
An article according to any of the preceding claims, wherein for a majority or all of said first outer cladding features, the minimum distance between two nearest neighbouring outer cladding features is smaller than 1.0 μm.
An article according to any of the preceding claims, wherein for a majority or all of said first outer cladding features, the minimum distance between two nearest neighbouring outer cladding features is smaller than an optical wavelength of light guided through the fibre when in use.
An article according to any of the preceding claims, wherein for a majority or all of said first outer cladding features, the minimum distance between two nearest neighbouring outer cladding features is smaller than a shortest optical wavelength of light guided through the fibre when in use.
An article according to any of the preceding claims, wherein the outer cladding has an effective refractive index with a value lower than the effective refractive index of any of the cores.
An article according to any of the preceding claims, wherein the largest cross-sectional dimension of the first outer cladding features are equal to or below 10
An article according to any of the preceding claims, wherein the largest cross-sectional dimension of the first outer cladding features are equal to or below 3 μm.
An article according to any of the preceding claims, wherein the optical fibre has a length with a first end and a second end, and wherein the cross-sectional area of the first outer cladding features in the first end are larger than any cross-sectional area of first outer cladding features in the second end.
An article according to any of the preceding claims, wherein the first outer cladding features are elongate features extending in a fibre axial direction.
An article according to any of the preceding claims, wherein the background material surrounding the first outer cladding features or the bridging material fulfilling the area between neighbouring first outer cladding features has a lower refractive index than the refractive index of the background material of the inner cladding.
An optical fibre for guiding light of at least one predetermined wavelength, the optical fiber having a longitudinal direction and a cross-section perpendicular thereto, the optical fibre comprising:
An optical fibre according to any one of claims 106-112 wherein the inner diameter or inner cross-sectional dimension of the first outer cladding region is in the range from 80 μm to 125 μm or in the range from 125 μm to 350 μm.
An optical fibre according to any one of claims 106-153 wherein the first outer cladding features are periodically distributed.
An optical fibre according to any one of claims 106-179 wherein the inner cladding features are elongate features extending in a fibre axial direction.
A method of producing an optical fibre for guiding light of at least one predetermined wavelength, the method comprising:
Dependencies are inferred from the claim text.