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Updated: Aug 23, 2025

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Electrically reconfigurable waveguide Bragg grating filters.

Mostafa Khalil, Hao Sun, Essam Berikaa

    Optics Express
    |October 27, 2022
    PubMed
    Summary
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    We developed reconfigurable waveguide Bragg grating filters using electrical heating. This allows dynamic control of filter responses for optical communication and signal processing, demonstrating flexible spectral shaping.

    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Semiconductor Devices

    Background:

    • Waveguide Bragg gratings are crucial for wavelength-selective optical devices.
    • Existing gratings often lack dynamic tunability, limiting their application flexibility.
    • Silicon-on-insulator (SOI) is a key platform for integrated photonic circuits.

    Purpose of the Study:

    • To propose and demonstrate an electrically reconfigurable waveguide Bragg grating filter.
    • To enable dynamic control over filter spectral responses for advanced optical systems.
    • To validate the device's performance and simulation framework.

    Main Methods:

    • Utilizing a silicon-on-insulator (SOI) platform with a multiple-contact heater element.
    • Implementing equidistant electrical pads to precisely control heat distribution along the grating.

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  • Employing COMSOL Multiphysics and the transfer matrix method for device simulation.

    • Main Results:

    • Achieved electrically controlled reconfiguration of filter spectral responses.
    • Demonstrated generation of multiple filter bands with up to 35 nm spacing.
    • Successfully created a Fabry-Pérot cavity with a 1.6 nm free-spectral range.
    • Simulation framework showed excellent agreement with experimental measurements.

    Conclusions:

    • Electrically reconfigurable waveguide Bragg gratings offer versatile spectral control.
    • The proposed device is suitable for wavelength division multiplexing and optical signal processing.
    • The accurate simulation framework facilitates future device design and optimization.