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Ultra-high-extinction-ratio 2 × 2 silicon optical switch with variable splitter.

Keijiro Suzuki, Guangwei Cong, Ken Tanizawa

    Optics Express
    |May 14, 2015
    PubMed
    Summary

    Researchers achieved a record 50.4 dB extinction ratio in a silicon Mach-Zehnder switch. This advancement uses a variable splitter to improve performance for multiport circuit switches, enabling mass production.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Semiconductor Devices

    Background:

    • Silicon Mach-Zehnder switches are crucial for optical communication networks.
    • Achieving high extinction ratios is essential for reliable signal switching.
    • Existing designs often face limitations in fabrication tolerance and performance.

    Purpose of the Study:

    • To demonstrate a record-high extinction ratio in a silicon Mach-Zehnder switch.
    • To address the need for improved performance in multiport circuit switches.
    • To ensure compatibility with standard semiconductor manufacturing processes.

    Main Methods:

    • Utilized a 2x2 silicon Mach-Zehnder switch architecture.
    • Incorporated a variable splitter as the front 3-dB splitter.

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  • Adjusted the variable splitter to precisely compensate for splitting-ratio mismatches.

    • Main Results:

    • Achieved a record-high extinction ratio of 50.4 dB.
    • The high extinction ratio was obtained without relying on waveguide crossings.
    • Demonstrated large fabrication tolerance for the device.

    Conclusions:

    • The developed silicon Mach-Zehnder switch offers superior extinction ratio performance.
    • The design is suitable for applications requiring high-performance multiport circuit switches.
    • The large fabrication tolerance facilitates volume production using standard CMOS facilities.