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Multi-core optical fiber and method of manufacturing the same

  • US 8,737,793 B2
  • Filed: 03/05/2013
  • Issued: 05/27/2014
  • Est. Priority Date: 03/16/2010
  • Status: Active Grant
First Claim
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1. A multi-core optical fiber comprising:

  • a plurality of core portions; and

    a cladding portion positioned so as to surround an outside of each of the core portions,whereineach of the core portions includes a center core portion that is positioned at a center of that core portion and that has a refractive index which is greater than that of the cladding portion, a second core portion that is formed so as to surround an outside of the center core portion and that has a refractive index which is less than that of the center core portion, and a depressed portion that is formed so as to surround an outside of the second core portion and that has a refractive index which is less than those of the second core portion and the cladding portion,a relative refractive-index difference of the center core portion with respect to the cladding portion is Δ

    1, a relative refractive-index difference of the second core portion with respect to the cladding portion is Δ

    2, a relative refractive-index difference of the depressed portion with respect to the cladding portion is Δ

    3, a diameter of the center core portion is 2A, an outside diameter of the second pore portion is 2B, an outside diameter of the depressed portion is 2C, B/A is Ra2, and C/A is Ra3,Δ

    1 is from 0.05% to 1.2%, Δ

    2 is almost 0%, Δ

    3 is equal to or greater than −

    0.7%, 2A is from 4 μ

    m to 14 μ

    m, Ra2 is 1 to 3, (Ra3−

    Ra2) is equal to or less than 2, a cut-off wavelength is from 1 μ

    m to 1.53 μ

    m, and an effective core area at a wavelength of 1.55 μ

    m is from 30 μ

    m2 to 180 μ

    m2, andan interval distance between each of the core portions and another one of the core portions positioned adjacent thereto is set such that optical cross-talk between the core portions for a total length of the multi-core optical fiber is equal to or less than −

    30 dB at a wavelength of 1.55 μ

    m.

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