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Alignment tolerant expanded beam connector based on a gapless fiber-lens interface.

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    A novel expanded beam connector (EBC) integrates a single-mode fiber with a ball lens, significantly enlarging the optical beam. This fiber-optic connector design relaxes structural tolerances and improves beam expansion efficiency.

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    Area of Science:

    • Optics
    • Photonics
    • Fiber Optics

    Background:

    • Traditional fiber-optic connectors require precise alignment and control of the gap between the fiber and lens.
    • Expanding the beam from a single-mode fiber is crucial for various optical applications, but often requires complex setups.

    Purpose of the Study:

    • To propose and realize an expanded beam connector (EBC) that simplifies fiber-optic integration.
    • To achieve a significant beam expansion with relaxed structural tolerances.
    • To analyze the performance and alignment sensitivities of the novel EBC design.

    Main Methods:

    • Design of the EBC using ray-optic simulations.
    • Construction of the EBC using a ball lens made of LASF35 glass.
    • Experimental characterization of beam expansion, alignment tolerance, and insertion loss.

    Main Results:

    • The EBC design achieved an ultrashort back focal length (BFL) of approximately 13 μm.
    • Demonstrated efficient conversion of a ~10 μm input mode to a ~350 μm collimated output beam, a 35-fold expansion.
    • Measured insertion loss was slightly over 0.8 dB with no separation between the fiber and ball lens.

    Conclusions:

    • The developed expanded beam connector offers a simplified and effective solution for fiber-to-free-space optical coupling.
    • The EBC design demonstrates robustness against alignment variations, making it practical for real-world applications.
    • This technology enables efficient beam expansion with minimal optical loss.