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Frequency locking for asymmetric Mach-Zehnder interferometer coupler-based Brillouin lasers.

Shilei Zhang, Chenchen Liu, Kaifei Li

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    This study introduces a novel asymmetric Mach-Zehnder interferometer coupler (AMZIC)-based resonator for Brillouin fiber-optic gyroscopes (BFOGs). The new design enhances coupling efficiency and simplifies frequency locking for practical inertial navigation applications.

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    Area of Science:

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

    Background:

    • Brillouin fiber-optic gyroscopes (BFOGs) are crucial for inertial navigation but face challenges like low coupling efficiency and complex frequency locking.
    • Existing BFOG designs are often bulky and inefficient, limiting their practical implementation.

    Purpose of the Study:

    • To develop a compact and efficient resonator for BFOGs using an asymmetric Mach-Zehnder interferometer coupler (AMZIC).
    • To propose a dedicated frequency-locking scheme tailored for the unique Brillouin spectrum.
    • To improve the overall performance and robustness of BFOGs for practical applications.

    Main Methods:

    • Implementation of an asymmetric Mach-Zehnder interferometer coupler (AMZIC)-based resonator.
    • Development and application of a specialized frequency-locking scheme for the butterfly-shaped Brillouin spectrum.
    • Experimental validation of the proposed system's performance metrics.

    Main Results:

    • Achieved a low threshold power of 27.44 mW.
    • Utilized a compact resonator with a length of 5.9 m.
    • Demonstrated a high polarization extinction ratio of 31 dB.
    • Maintained stable frequency locking for over 4000 seconds.

    Conclusions:

    • The AMZIC-based resonator effectively addresses key challenges in BFOGs, including low coupling efficiency and complex frequency locking.
    • The proposed frequency-locking scheme ensures robust and stable operation.
    • The demonstrated performance metrics highlight the system's potential for practical and high-performance BFOG applications in inertial navigation.