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Rare earth doped and large effective area optical fibers for fiber lasers and amplifiers

  • US 9,151,889 B2
  • Filed: 09/11/2013
  • Issued: 10/06/2015
  • Est. Priority Date: 09/20/2006
  • Status: Expired due to Fees
First Claim
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1. An optical fiber system for providing optical amplification, said optical fiber system comprising:

  • a large-core optical fiber comprising;

    a core having a core radius p and a core index of refraction ncore, wherein said core comprises a doped region;

    a first cladding disposed about said core, said first cladding having an outer radius ρ

    1 and an index of refraction nc1, said core and said first cladding having a difference in index of refraction Δ

    n =ncore

    nc1; and

    a second cladding disposed about said first cladding, said first cladding and said second cladding having a difference in index of refraction Δ

    n1, said second cladding comprising holes that are configured to provide leakage channels such that said large-core optical fiber supports one or a few modes and higher order modes are leaked,wherein the first cladding radius, ρ

    1, is greater than about 1.1ρ and

    less than about 2ρ

    , and the refractive index difference between said first cladding and said second cladding, Δ

    n1, is greater than about 1.5Δ

    n and less than about 50Δ

    n,wherein said large-core optical fiber comprises a combined waveguide formed by said core and said first cladding layer, said combined waveguide configured such that a mode supported in said core has increased gain relative to a mode having substantial power in said first cladding.

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