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    Area of Science:

    • Photonics and Optical Engineering
    • Sensor Technology
    • Control Systems

    Background:

    • Fiber-optic gyroscopes (FOGs) are essential sensors for navigation, positioning, and seismology.
    • Closed-loop FOG configurations are vital for applications demanding high bandwidth and dynamic range, such as rotational seismology.

    Purpose of the Study:

    • To present a novel closed-loop fiber-optic gyroscope (FOG) design.
    • To enhance dynamic range and bandwidth performance in FOG systems.

    Main Methods:

    • Implementation of a dual feedback configuration in a closed-loop FOG.
    • Control of optical phase using serrodyne modulation with an electro-optic modulator.
    • Stabilization of electronic phase via a digital phase-locked loop (PLL) system.

    Main Results:

    • The novel FOG design demonstrates significantly improved performance.
    • Achieved a dynamic range gain of up to four orders of magnitude at low frequencies.
    • Maintained high bandwidth capabilities suitable for dynamic measurements.

    Conclusions:

    • The dual feedback closed-loop FOG offers a substantial advancement in sensor performance.
    • This approach effectively addresses the need for wide dynamic range and high bandwidth in demanding applications.
    • The developed FOG system shows promise for enhanced rotational seismology and inertial sensing.