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Ultra compact Bragg grating devices with broadband selectivity.

Ang Li, Jordan Davis, Yeshaiahu Fainman

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    |February 1, 2020
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    Summary
    This summary is machine-generated.

    Researchers developed a compact Bragg grating using nanoholes for ultra-wide stopbands in silicon photonics. This novel approach achieves a 110 nm stopband, crucial for broadband optical communication applications.

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    Area of Science:

    • Photonics
    • Materials Science
    • Optical Engineering

    Background:

    • Silicon waveguide Bragg gratings commonly use weak perturbations (width/cladding modulation).
    • Weak perturbations limit stopband width due to scattering loss and modal coupling.
    • Achieving ultra-wide stopbands requires overcoming these limitations.

    Purpose of the Study:

    • To report a novel ultra-compact Bragg grating device.
    • To enable ultra-wide stopbands using strong perturbations.
    • To demonstrate apodization through precise nanoholes placement.

    Main Methods:

    • Etching nanoholes directly into the silicon waveguide core.
    • Implementing apodization by strategically locating nanoholes.
    • Fabricating a 15 µm long Bragg grating device.

    Main Results:

    • Achieved an ultra-large stopband of 110 nm, covering the C+L telecommunication bands.
    • Demonstrated a 40 dB extinction ratio.
    • Obtained over 10 dB sidelobe suppression ratio (SSR), with potential for >17 dB.

    Conclusions:

    • The nanoholes-in-core approach enables ultra-compact devices with ultra-wide stopbands.
    • This method overcomes limitations of traditional weak perturbation gratings.
    • The technology is promising for advanced silicon photonic integrated circuits.