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Silicon photonics-based laser Doppler vibrometer with an integrated phase modulator.

Shin Arahira, Hideki Ono, Yosuke Onawa

    Optics Express
    |November 11, 2025
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    Summary

    This study introduces a compact silicon photonics laser Doppler vibrometer (LDV) using phase-generated carrier (PGC-Arctan) demodulation. The integrated system shows practical viability for vibration measurement applications.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Microelectromechanical Systems (MEMS)

    Background:

    • Laser Doppler Vibrometry (LDV) systems traditionally require bulky components.
    • Miniaturization is crucial for expanding LDV applications in various fields.
    • Silicon photonics offers a platform for integrating complex optical functions onto a single chip.

    Purpose of the Study:

    • To develop a small-footprint, silicon photonics-based laser Doppler vibrometer (LDV).
    • To evaluate the performance of an integrated silicon photonics LDV system.
    • To compare the performance against conventional LDV configurations.

    Main Methods:

    • Utilized a phase-modulating interferometer with an integrated silicon optical phase modulator (SiPh-PM).
    • Employed the arctangent approach of phase-generated carrier (PGC-Arctan) demodulation.
    • Experimentally evaluated performance using discrete and integrated SiPh-PM modules.

    Main Results:

    • Demonstrated sufficient performance metrics for practical LDV applications.
    • The integrated core-chip module showed comparable results to discrete components.
    • The silicon photonics LDV proved usable in real-world scenarios.

    Conclusions:

    • An integrated silicon photonics LDV system based on PGC-Arctan demodulation is feasible.
    • This technology enables compact and practical vibration measurement solutions.
    • Further development can lead to widespread adoption in diverse industries.