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Related Experiment Videos

Multimode waveguide crossing based on a square Maxwell's fisheye lens.

S Hadi Badri, H Rasooli Saghai, Hadi Soofi

    Applied Optics
    |June 29, 2019
    PubMed
    Summary

    This study presents a novel waveguide crossing for mode-division multiplexing (MDM) using a Maxwell

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    Area of Science:

    • Photonics and Optical Communications
    • Integrated Optics
    • Transformation Optics

    Background:

    • Mode-division multiplexing (MDM) enables higher data capacities by using orthogonal modes as separate data streams.
    • Waveguide crossings in MDM systems face challenges with mode leakage, hindering performance.
    • Efficient routing of multiple modes is crucial for advancing high-capacity optical networks.

    Purpose of the Study:

    • To design and implement a compact, low-loss waveguide crossing for MDM systems.
    • To minimize mode leakage and crosstalk in multimode waveguide intersections.
    • To demonstrate a versatile method for creating advanced optical routing components.

    Main Methods:

    • Designed a square Maxwell's fish-eye lens using quasiconformal transformation optics.
    • Implemented the lens on a silicon-on-insulator platform using graded photonic crystals and varying silicon slab thickness.
    • Conducted three-dimensional numerical simulations to analyze performance.

    Main Results:

    • Achieved an ultrawide operational bandwidth from 1260 to 1675 nm.
    • Demonstrated a compact footprint of 3.77×3.77 μm².
    • Exhibited excellent performance for TE0, TE1, and TE2 modes with low insertion loss, minimal crosstalk (< -27 dB), and high return loss (> 30 dB).
    • Supported low-distortion pulse transmission with a fidelity factor of 0.9857.

    Conclusions:

    • The designed Maxwell's fish-eye lens offers a highly effective solution for multimode waveguide crossings in MDM.
    • The proposed design approach is scalable to support even higher numbers of modes.
    • This work contributes to the development of advanced integrated photonic devices for future high-capacity communication systems.

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