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Extremely compact three-axis interferometric fiber optic gyroscope based on a time division multiplexing approach.

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    A new compact three-axis interferometric fiber optic gyroscope (IFOG) uses time division multiplexing (TDM) for enhanced performance. This design significantly reduces size, weight, power, and cost, achieving excellent angular random walk values.

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    Area of Science:

    • Photonics and Optical Engineering
    • Inertial Navigation Systems
    • Fiber Optic Sensors

    Background:

    • Traditional fiber optic gyroscopes face challenges in size, weight, power consumption, and cost.
    • Time division multiplexing (TDM) offers a potential solution for miniaturization and integration.
    • Existing TDM methods often require complex modulation sequences and separate components.

    Purpose of the Study:

    • To develop an extremely compact three-axis interferometric fiber optic gyroscope (IFOG).
    • To enhance the size, weight, power consumption, and cost (SWaP-C) of IFOGs.
    • To simplify the modulation process for multi-axis IFOG systems.

    Main Methods:

    • Implementation of a novel time division multiplexing (TDM) approach for a three-axis IFOG.
    • Concurrent multiplexing of the optical source, photodetector, signal processing circuit, and multifunctional integrated optics circuit (MIOC).
    • Utilizing a single MIOC for modulating all three axes, with distinct time segment modulation achieved by adjusting fiber coil length ratios.

    Main Results:

    • Demonstration of an extremely compact three-axis IFOG.
    • Achievement of significantly reduced size, weight, power consumption, and cost.
    • Obtained angular random walk values of 0.195°/h, 0.031°/h, and 0.014°/h for the three axes.

    Conclusions:

    • The proposed TDM-based three-axis IFOG effectively integrates multiple components and simplifies modulation.
    • This innovative design offers substantial improvements in SWaP-C compared to traditional methods.
    • The achieved performance metrics indicate the system's viability for various inertial sensing applications.