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    This study introduces an efficient, broadband parametric wavelength converter using silicon-on-insulator waveguides. Vertical gratings enable quasi-phase-matching for four-wave mixing, suppressing attenuation and enhancing conversion efficiency and bandwidth.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science (Silicon Photonics)

    Background:

    • Parametric wavelength conversion is crucial for optical signal processing and telecommunications.
    • Traditional methods often require precise dispersion engineering or suffer from limited bandwidth.
    • Silicon-on-insulator (SOI) waveguides offer a promising platform for integrated photonic devices.

    Purpose of the Study:

    • To propose an efficient and broadband parametric wavelength converter in SOI waveguides.
    • To achieve quasi-phase-matching (QPM) for four-wave mixing (FWM) without dispersion engineering.
    • To enhance conversion efficiency and extend the 3-dB conversion bandwidth.

    Main Methods:

    • Utilized a vertical grating structure for quasi-phase-matching (QPM) in SOI waveguides.
    • Implemented alternating phase-mismatch values to suppress parametric attenuation.
    • Investigated the impact of propagation length and grating width on conversion bandwidth.

    Main Results:

    • Achieved significant improvement in conversion efficiency at the designated signal wavelength.
    • Demonstrated an effectively extended 3-dB conversion bandwidth.
    • Showcased insensitivity of conversion bandwidth to propagation length and grating width, mitigating tradeoffs.

    Conclusions:

    • The proposed vertical grating approach enables efficient and broadband parametric wavelength conversion in SOI.
    • Suppression of parametric attenuation via alternating phase-mismatch is key to performance.
    • A 331 nm bandwidth and -12.8 dB peak efficiency were realized with a 1.5 cm grating.