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Large core area single mode optical fiber

  • US 8,903,214 B2
  • Filed: 06/27/2011
  • Issued: 12/02/2014
  • Est. Priority Date: 06/25/2010
  • Status: Active Grant
First Claim
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1. A single-mode optical fiber for guiding an optical signal, said optical fiber having a longitudinal, optical axis and a cross section perpendicular thereto, said optical fiber comprising:

  • a core region being capable of guiding an optical signal in a fundamental core mode with an effective refractive index, nc, at an optical signal wavelength, λ

    1;

    a cladding region surrounding the core region, the cladding region comprising an inner cladding region and an outer cladding region, said inner cladding region comprising a background material having a refractive index, nb, and a plurality of inner cladding features arranged in said background material, wherein at least a plurality of said plurality of inner cladding features are of a first type of feature, said first type of feature comprising an air hole surrounded by a high-index region comprising a high-index material having a refractive index, nr, that is larger than the refractive index of the inner cladding background material, said first type of feature supports an optical mode with an effective refractive index, n1, which is lower than or equal to the effective refractive index of the fundamental core mode, nc, at said optical signal wavelength, λ

    1,wherein said core region has a maximum cross-sectional dimension of more than about 40 μ

    m,and wherein the index difference between the high-index material and the background material of the inner cladding is below about 1.10

    2
    .

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