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Turn-key, high-efficiency Kerr comb source.

Bok Young Kim, Yoshitomo Okawachi, Jae K Jang

    Optics Letters
    |September 14, 2019
    PubMed
    Summary
    This summary is machine-generated.

    We developed automated Kerr comb generation in silicon nitride, achieving 41% efficiency in the normal group-velocity dispersion (GVD) regime. This breakthrough enables on-demand, high-power frequency comb sources for optical communications.

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    Area of Science:

    • Photonics
    • Nonlinear Optics
    • Integrated Photonics

    Background:

    • Kerr combs are crucial for optical frequency synthesis.
    • Generating Kerr combs in the normal group-velocity dispersion (GVD) regime offers advantages but faces challenges.
    • Automated and efficient generation methods are needed for practical applications.

    Purpose of the Study:

    • To demonstrate an automated approach for Kerr comb generation in the normal GVD regime.
    • To achieve high pump-to-comb conversion efficiency and low noise.
    • To enable on-demand generation of high-power frequency comb sources.

    Main Methods:

    • Utilized a silicon nitride coupled-ring resonator geometry.
    • Precisely controlled avoided mode crossings to engineer comb properties.
    • Employed an automated system for comb generation.

    Main Results:

    • Achieved automated Kerr comb generation in the normal GVD regime.
    • Reported a record pump-to-comb conversion efficiency of up to 41% for normal-GVD Kerr combs.
    • Generated low-noise frequency combs.
    • Demonstrated the highest efficiency to date for normal-GVD Kerr combs.

    Conclusions:

    • The developed technique allows for on-demand generation of high-power Kerr comb sources.
    • This advancement is significant for applications like wavelength-division multiplexing in optical communications.
    • The approach offers a promising route for practical integrated photonic devices.