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    We developed compact, low-loss optical interconnection devices for hollow core fibers (HCFs) using micro-optic collimator technology. This method offers low Fresnel reflection and a hermetic seal, crucial for HCF applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Hollow core fibers (HCFs) offer unique light-guiding properties but require specialized interconnection methods.
    • Existing methods for HCF interconnection can be complex, costly, or lead to signal loss and poor sealing.
    • Micro-optic collimator technology is a key platform for commercial fiber optic components.

    Purpose of the Study:

    • To present a novel, compact, and low-loss optical interconnection device for various types of HCFs.
    • To demonstrate the compatibility of micro-optic collimator technology with HCFs without significant fiber modification.
    • To achieve low Fresnel reflection and hermetic sealing for HCF interconnections.

    Main Methods:

    • Utilized micro-optic collimator technology for fabricating optical interconnection devices.
    • Integrated various state-of-the-art hollow core fibers into the micro-optic collimator platform.
    • Characterized interconnection performance, including insertion loss, Fresnel reflection, and modal purity.

    Main Results:

    • Achieved compact and low-loss optical interconnection devices for HCFs.
    • Demonstrated low insertion loss ranging from 0.5-2 dB.
    • Obtained very low Fresnel reflection (<-45 dB) and high modal purity (>20 dB).
    • Provided a hermetic seal for HCFs, addressing a critical application requirement.

    Conclusions:

    • Micro-optic collimator technology provides an effective and versatile platform for HCF interconnection.
    • The developed devices are suitable for a wide range of HCF applications requiring high performance and reliability.
    • This approach simplifies HCF component manufacturing and enhances device performance.