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Large effective area low attenuation optical fiber

  • US 8,218,929 B2
  • Filed: 01/21/2010
  • Issued: 07/10/2012
  • Est. Priority Date: 02/26/2009
  • Status: Expired due to Fees
First Claim
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1. An optical fiber comprising:

  • a glass core extending from a centerline to a radius R1, wherein R1 is greater than about 5 μ

    m;

    a glass cladding surrounding and in contact with the core;

    wherein the cladding comprises;

    a first annular region extending from the radius R1 to a radius R2, the first annular region comprising a radial width W1=R2

    R1;

    a second annular region extending from the radius R2 to a radius R3, the second annular region comprising a radial width W2=R3

    R2;

    a third annular region extending from the radius R3 to a radius R4, the third annular region comprising a radial width W3=R4

    R3; and

    a fourth annular region extending from the radius R4 to an outermost glass radius R5;

    wherein the core comprises a maximum relative refractive index, Δ

    0MAX, the second annular region comprises a minimum relative refractive index, Δ

    2MIN, and the third annular region comprises a minimum relative refractive index, Δ

    3MIN, wherein Δ

    0MAX>

    0>

    Δ

    2MIN>

    Δ

    3MIN; and

    wherein the core and the cladding provide a fiber with cable cutoff less than 1500 nm and an effective area at 1550 nm of greater than 130 μ

    m2.

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