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Related Experiment Video

Updated: Nov 12, 2025

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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On-chip optical true time delay lines based on subwavelength grating waveguides.

Yue Wang, Hao Sun, Mostafa Khalil

    Optics Letters
    |March 15, 2021
    PubMed
    Summary

    We developed a compact optical true time delay line (OTTDL) using subwavelength grating waveguides. This device offers versatile microwave signal processing for optical communications and photonics.

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    Area of Science:

    • Photonics
    • Optical Communications
    • Materials Science

    Background:

    • Optical true time delay lines (OTTDLs) are crucial for signal processing in microwave photonics and optical communications.
    • Existing OTTDLs may face limitations in terms of size and versatility.

    Purpose of the Study:

    • To experimentally demonstrate a novel index-variable OTTDL.
    • To leverage subwavelength grating (SWG) waveguides for enhanced performance.

    Main Methods:

    • Fabrication of an array of 40 SWG waveguides on a silicon-on-insulator platform.
    • Arrangement of each 34 mm long waveguide in a serpentine configuration.
    • Characterization of incremental and total signal delays.

    Main Results:

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    • Achieved an average incremental delay of approximately 4.7 ps between waveguides.
    • Demonstrated a total delay of approximately 181.9 ps across the waveguide array.
    • The compact device occupies a chip area of 56.55 mm².

    Conclusions:

    • The proposed index-variable OTTDL offers significant advantages in compactness.
    • The device exhibits operational versatility for various microwave signal processing applications.
    • This advancement holds potential for next-generation optical communication systems.