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Annular-cladding erbium doped multicore fiber for SDM amplification.

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    We developed new annular-cladding erbium-doped multicore fibers (AC-EDMCF) for improved optical amplifier efficiency. These fibers enhance pump power delivery for spatial division multiplexing (SDM) transmission.

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    Area of Science:

    • Optical Fiber Technology
    • Telecommunications Engineering
    • Materials Science

    Background:

    • Spatial Division Multiplexing (SDM) requires efficient optical amplifiers.
    • Standard double-clad fiber designs face limitations in pump power efficiency.
    • Erbium-doped multicore fibers are crucial for high-capacity optical networks.

    Purpose of the Study:

    • To propose and numerically investigate novel annular-cladding erbium-doped multicore fibers (AC-EDMCF).
    • To enhance pump power efficiency in optical amplifiers for SDM transmission.
    • To compare all-glass and air-hole inner cladding designs for AC-EDMCF.

    Main Methods:

    • Numerical simulations to determine optimal fiber parameters.
    • Design of an all-glass fiber with a depressed refractive index inner cladding.
    • Investigation of a multi-spot pump injection scheme.
    • Analysis of fiber designs with solid and air-hole inner cladding.

    Main Results:

    • The proposed all-glass AC-EDMCF design predicts a 10 dB gain increase.
    • A 21% saving in pump power is achieved compared to standard double-clad fibers.
    • Air-hole inner cladding further enhances pump confinement and minimizes power leakage.

    Conclusions:

    • Annular-cladding designs significantly improve pump power efficiency in EDMCF for SDM.
    • The all-glass AC-EDMCF offers substantial performance gains.
    • Air-hole AC-EDMCF provides superior pump confinement, outperforming the all-glass design.