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Related Experiment Video

Updated: Jan 1, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Integrated photonic tunable basic units using dual-drive directional couplers.

Daniel Pérez-López, Ana M Gutierrez, Erica Sánchez

    Optics Express
    |December 28, 2019
    PubMed
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    We developed a novel thermally actuated Dual-Drive Directional Coupler (DD-DC) for photonic integrated circuits. This component acts as a versatile Tunable Basic Unit (TBU), enabling dynamic reconfiguration of optical circuits.

    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Nanophotonics

    Background:

    • Photonic integrated circuits (PICs) require scalable Tunable Basic Units (TBUs) for complex optical processing.
    • Existing TBUs often lack dynamic reconfigurability and efficient integration.
    • Waveguide meshes and multibeam interferometers are key architectures demanding advanced TBU designs.

    Purpose of the Study:

    • To propose and demonstrate a novel thermally actuated Dual-Drive Directional Coupler (DD-DC) as a TBU.
    • To integrate the DD-DC on a silicon nitride platform for enhanced performance.
    • To showcase the first integrated triangular waveguide mesh using these novel TBUs.

    Main Methods:

    • Design and fabrication of a silicon nitride based DD-DC.

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    Last Updated: Jan 1, 2026

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  • Thermal actuation for phase control and beam splitting.
  • Integration of multiple DD-DCs into a triangular waveguide mesh.
  • Experimental characterization of individual DD-DC performance and mesh scalability.

    • Main Results:

    • Successful demonstration of a thermally actuated DD-DC operating as a TBU.
    • Achieved arbitrary optical beam splitting and common phase control with the DD-DC.
    • Fabricated and analyzed the first integrated triangular waveguide mesh using DD-DC TBUs.
    • Evaluated the performance, low loss, and potential for low footprint of the proposed TBU.

    Conclusions:

    • The DD-DC is a promising, reconfigurable TBU for advanced PICs.
    • Silicon nitride platform enables efficient integration and performance.
    • The demonstrated waveguide mesh highlights the scalability and potential of DD-DC based TBUs for complex photonic systems.