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All-optical remotely controllable 1 × 8 silicon thermo-optic switch based on Mach-Zehnder interferometers.

Zhu Liang, Yuya Shoji

    Optics Express
    |August 13, 2025
    PubMed
    Summary
    This summary is machine-generated.

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    This study presents an all-optical switch using a thermo-optic (TO) phase shifter. The silicon Mach-Zehnder interferometer (MZI) switch demonstrates broadband performance for optical signal processing.

    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science for Optoelectronics

    Background:

    • All-optical switches are crucial for high-speed optical communication networks.
    • Thermo-optic (TO) phase shifters offer a viable mechanism for optical switching.
    • Silicon photonics provides a scalable platform for integrated optical devices.

    Purpose of the Study:

    • To experimentally demonstrate a silicon Mach-Zehnder interferometer (MZI) based thermo-optic (TO) switch.
    • To characterize the broadband switching performance, crosstalk, and insertion loss of the proposed device.
    • To evaluate the potential applications of the TO switch in passive optical networks.

    Main Methods:

    • Fabrication of a 1x8 MZI-based silicon TO switch utilizing a titanium metal heater.
    • Experimental measurement of switching performance including crosstalk and insertion loss across the C-band.

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  • Characterization of the π-phase-shift power (Pπ) and switching times (rise and fall) of the 1x2 MZI unit.

    • Main Results:

    • The 1x8 MZI-based silicon TO switch achieved broadband switching in the C-band.
    • Worst-case crosstalk was measured at 15.2 dB, with a minimum insertion loss of 5.0 dB.
    • The 1x2 MZI unit demonstrated a Pπ of 46.2 mW and switching times of 1.7 µs (rise) and 4.4 µs (fall).

    Conclusions:

    • The demonstrated silicon TO switch offers efficient broadband optical switching capabilities.
    • The device exhibits promising performance metrics for integration into optical communication systems.
    • Potential applications include remote control in all-optical signal processing for passive optical networks.