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Mode-sorter design using continuous supersymmetric transformation.

Wiktor Walasik, Nitish Chandra, Bikashkali Midya

    Optics Express
    |September 13, 2019
    PubMed
    Summary
    This summary is machine-generated.

    We developed a photonic mode sorter using supersymmetric transformations. This new design significantly reduces signal interference and loss, outperforming traditional splitters for integrated photonic devices.

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    Area of Science:

    • * Integrated photonics
    • * Quantum optics
    • * Materials science

    Background:

    • * Photonic mode sorters are crucial for signal processing in integrated photonic circuits.
    • * Conventional devices like Y-splitters often suffer from significant modal cross-talk and scattering losses.
    • * Efficient manipulation of light modes is essential for advanced optical communication and computing.

    Purpose of the Study:

    • * To design a novel photonic mode sorter utilizing continuous supersymmetric (SUSY) transformations.
    • * To achieve spatial separation of waveguide modes while preserving their propagation constants.
    • * To minimize modal cross-talk and scattering losses for enhanced device performance.

    Main Methods:

    • * Application of continuous supersymmetric transformations to dielectric permittivity profiles.
    • * Leveraging iso-spectrality to maintain mode propagation constants during spatial separation.
    • * Adiabatic modification of the refractive index landscape along the propagation direction.

    Main Results:

    • * The SUSY mode sorter demonstrates a reduction in cross-talk by at least two orders of magnitude compared to standard Y-splitters.
    • * Achieved negligible modal cross-talk (-35 dB at telecommunication wavelengths) and low scattering losses.
    • * The device exhibits polarization independence (sorting both transverse-electric and transverse-magnetic modes) and broad wavelength operation.

    Conclusions:

    • * The proposed SUSY mode sorter offers superior performance in terms of cross-talk and loss reduction.
    • * The design enables efficient signal manipulation in integrated photonic devices.
    • * This approach paves the way for next-generation photonic integrated circuits with enhanced functionality.