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    This study introduces a novel fiber Bragg grating (FBG) demodulation system using arrayed waveguide gratings (AWGs). The system achieves high-speed, accurate wavelength demodulation for advanced FBG sensing applications.

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    Area of Science:

    • Photonics and Optical Engineering
    • Sensor Technology
    • Integrated Optics

    Background:

    • Fiber Bragg Gratings (FBGs) are crucial for sensing applications.
    • Existing FBG demodulation systems face limitations in speed and accuracy.
    • Arrayed Waveguide Gratings (AWGs) offer potential for high-performance optical signal processing.

    Purpose of the Study:

    • To propose and demonstrate a novel FBG demodulation system utilizing AWGs.
    • To design, fabricate, and integrate key components for the system.
    • To evaluate the system's performance in terms of accuracy, speed, and acceleration error.

    Main Methods:

    • Designed and fabricated an AWG chip on a silica-on-silicon planar lightwave circuit (PLC) platform.
    • Integrated the AWG with a photodiode (PD) array and developed demodulation circuitry including TIAs and ADCs.
    • Implemented high-speed data acquisition and transmission via an Ethernet interface.

    Main Results:

    • Achieved a wavelength demodulation accuracy of 4.24 pm.
    • Demonstrated a demodulation rate exceeding 200 kHz.
    • Obtained an average demodulation acceleration error better than 22.8 mg.

    Conclusions:

    • The proposed AWG-based FBG demodulation system offers high accuracy and speed.
    • The compact system is suitable for high-frequency vibration sensing applications.
    • This technology advances optical sensing capabilities for demanding environments.