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Integrated silicon modulator based on microring array assisted MZI.

Xiangdong Li, Xue Feng, Kaiyu Cui

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    |June 13, 2014
    PubMed
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    This study demonstrates a compact silicon modulator using a microring array assisted Mach-Zehnder interferometer (MZI). The device shows a 2GHz modulation bandwidth and stable performance across a wide temperature range.

    Area of Science:

    • Integrated photonics
    • Silicon photonics
    • Optoelectronics

    Background:

    • Silicon modulators are crucial for optical interconnects.
    • Mach-Zehnder interferometers (MZIs) offer modulation capabilities.
    • Temperature stability is a key challenge for silicon photonic devices.

    Purpose of the Study:

    • To experimentally demonstrate a novel silicon modulator design.
    • To investigate the performance of a microring array assisted MZI modulator.
    • To assess the temperature stability of the proposed modulator.

    Main Methods:

    • Fabrication of a silicon modulator on a silicon-on-insulator wafer using a CMOS-compatible process.
    • Integration of a microring array with a Mach-Zehnder interferometer (MZI).

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  • Characterization of modulation bandwidth and performance under varying ambient temperatures.

    • Main Results:

    • A compact modulator footprint of approximately 600 μm² was achieved.
    • A 3-dB modulation bandwidth of approximately 2 GHz was obtained using a forward-biased, current-driven p-n junction.
    • The MZI design effectively minimized temperature-induced performance variations, with a maximum modulation curve divergence of less than 3 dB over a 10-70 °C temperature range.

    Conclusions:

    • The demonstrated silicon modulator with a microring array assisted MZI offers a compact and temperature-stable solution.
    • The device shows potential for high-performance optical communication systems.
    • CMOS-compatible fabrication ensures scalability and integration feasibility.