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Design of a high-efficiency U-shape MOS capacitor Michelson interferometer modulator.

Deyue Ma, Xiwen He, Chen Zhou

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    Researchers developed a novel U-shape MOS capacitor Michelson interferometer modulator for enhanced optical modulation efficiency. This compact, energy-efficient device operates at 50 Gbaud/s with low drive voltage, reducing reliance on external driver circuits.

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    Area of Science:

    • Photonics and Optoelectronics
    • Integrated Optics
    • Semiconductor Devices

    Background:

    • Existing electro-optic modulators face challenges in achieving high modulation efficiency and low power consumption.
    • Metal-Oxide-Semiconductor (MOS) capacitor modulators offer potential for miniaturization and integration.
    • Michelson interferometer configurations can enhance modulation performance through bidirectional light propagation.

    Purpose of the Study:

    • To present a novel U-shape MOS capacitor Michelson interferometer modulator.
    • To enhance modulation efficiency and reduce drive voltage requirements.
    • To explore applications in energy-efficient and compact optical transmitters.

    Main Methods:

    • Design and fabrication of a U-shape MOS capacitor structure.
    • Integration of the U-shape MOS capacitor into a Michelson interferometer.
    • Characterization of modulation efficiency, operating speed, and extinction ratio.

    Main Results:

    • Achieved high modulation efficiency of 1.08 V·mm due to vertical optical mode compression.
    • Demonstrated 50 Gbaud/s operation with a low 2 Vpp drive voltage.
    • Obtained an extinction ratio of approximately 2.3 dB.

    Conclusions:

    • The U-shape MOS capacitor Michelson interferometer modulator offers superior performance.
    • The device significantly enhances modulation efficiency without increasing capacitance or resistance.
    • This technology presents a promising solution for energy-efficient, compact optical transmitters, reducing reliance on external driver circuits.