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Related Concept Videos

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Related Experiment Video

Updated: Jul 31, 2025

Writing Bragg Gratings in Multicore Fibers
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Gap design to enable functionalities into nested antiresonant nodeless fiber based systems.

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    Researchers created an air gap between standard single-mode fiber and hollow-core fiber for new optical functions. This novel design allows for low-loss coupling and the integration of optical elements, demonstrating a functional fiber optic filter.

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    Area of Science:

    • Optics and Photonics
    • Fiber Optics
    • Optical Engineering

    Background:

    • Standard single-mode fiber (SSMF) and nested antiresonant nodeless type hollow-core fiber (NANF) are key components in optical communication.
    • Integrating different fiber types often requires complex and lossy coupling methods.
    • There is a need for adaptable fiber interconnections that allow for additional functionalities.

    Purpose of the Study:

    • To develop a novel interconnection design between SSMF and NANF that incorporates an air gap.
    • To demonstrate low-loss optical coupling across this air gap using mode-field adapters.
    • To showcase the functional integration of optical elements within the air gap for enhanced device capabilities.

    Main Methods:

    • Modified the interconnection between SSMF and NANF to create a controllable air gap.
    • Utilized graded-index multimode fibers as mode-field adapters for efficient coupling.
    • Inserted optical elements into the air gap to test its functionality and performance.

    Main Results:

    • Achieved low-loss coupling between SSMF and NANF with varying air-gap distances.
    • Successfully demonstrated the insertion of optical elements within the air gap.
    • Fabricated a Fabry-Perot interferometer using a thin glass sheet in the air gap, functioning as a filter with minimal 0.31 dB insertion loss.

    Conclusions:

    • The proposed air-gap interconnection design effectively bridges SSMF and NANF with low loss.
    • The air gap provides a versatile platform for integrating additional optical functions into fiber optic systems.
    • This approach offers a promising method for developing advanced fiber-based optical devices and filters.