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    We developed a novel multicore fiber for radiofrequency true time delay, minimizing dispersion and crosstalk. This innovation enables compact, integrated solutions for future fiber-wireless communication systems.

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    Area of Science:

    • Optoelectronics
    • Optical Fiber Communications
    • Signal Processing

    Background:

    • Radiofrequency (RF) true time delay (TTD) is crucial for advanced systems like phased array antennas.
    • Existing solutions face challenges with size, crosstalk, and dispersion management.

    Purpose of the Study:

    • To design and optimize a trench-assisted heterogeneous multicore fiber for RF TTD applications.
    • To address the tradeoff between crosstalk, fiber curvature, and group delay linearity.

    Main Methods:

    • Analysis of core refractive index profile's influence on dispersion and crosstalk.
    • Optimization of multicore fiber design considering performance tradeoffs.
    • Experimental validation in microwave signal filtering and optical beamforming.

    Main Results:

    • Achieved group delay relative error below 5% over a 100 nm optical wavelength range.
    • Demonstrated crosstalk below -80 dB for bending radii larger than 103 mm.
    • Validated performance for microwave signal filtering and optical beamforming.

    Conclusions:

    • The optimized multicore fiber offers a compact solution for RF TTD.
    • This technology supports distributed signal processing for future fiber-wireless networks.