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Ultracompact silicon-on-insulator-based reflective arrayed waveguide gratings for spectroscopic applications.

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    |May 4, 2016
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    Ultracompact reflective arrayed waveguide gratings (RAWGs) offer high performance for on-chip spectroscopic sensing. These devices achieve low losses and crosstalk, enabling advanced photonic applications.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Nanophotonics

    Background:

    • Arrayed waveguide gratings (AWGs) are key components in wavelength-division multiplexing (WDM) systems.
    • Miniaturization of AWGs is crucial for increasing device density and reducing system costs.
    • High-index contrast platforms enable the fabrication of compact photonic devices.

    Purpose of the Study:

    • To design and fabricate ultracompact reflective arrayed waveguide gratings (RAWGs).
    • To demonstrate RAWGs with 400 GHz and 200 GHz channel spacing for TE and TM polarizations.
    • To evaluate the performance of these RAWGs in terms of insertion loss and crosstalk.

    Main Methods:

    • Utilizing a half horseshoe-shaped waveguide layout for RAWG design.
    • Incorporating distributed Bragg reflector (DBR) mirrors in the array region.
    • Fabricating RAWGs on a high-index contrast silicon-on-insulator (SOI) platform.
    • Characterizing RAWGs using off-centered light input for TE and TM polarizations.

    Main Results:

    • Achieved ultracompact RAWGs due to high-index contrast.
    • Demonstrated 9x400 GHz and 20x200 GHz RAWGs for TE polarization with minimal on-chip losses of 7 and 9 dB, and crosstalk below -8 and -5 dB, respectively.
    • Demonstrated 8x400 GHz and 10x200 GHz RAWGs for TM polarization with minimal on-chip losses of 10 and 12.5 dB, and crosstalk below -11 and -7 dB, respectively.

    Conclusions:

    • The designed and fabricated ultracompact RAWGs exhibit excellent performance characteristics.
    • These RAWGs are suitable for integration into various photonic systems.
    • Potential applications include on-chip spectroscopic sensing and advanced WDM systems.