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    This study presents a universal model for waveguide-type ring resonators (WRRs) in resonant micro-optic gyroscopes (RMOGs). The model addresses polarization errors, crucial for accurate rotation sensing, and proposes a grating solution to minimize temperature-dependent errors.

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    Area of Science:

    • Optics
    • Photonics
    • Sensor Technology

    Background:

    • The waveguide-type ring resonator (WRR) is a critical component for rotation sensing in resonant micro-optic gyroscopes (RMOGs).
    • Polarization characteristics of WRRs can lead to temperature-related errors, impacting gyroscope accuracy.
    • Understanding and mitigating these polarization issues are essential for developing high-performance RMOGs.

    Purpose of the Study:

    • To develop a universal model for analyzing polarization characteristics and temperature-induced polarization errors in WRRs for RMOG applications.
    • To experimentally verify the theoretical model using different silica WRRs.
    • To propose and validate a novel method for reducing polarization errors in WRRs.

    Main Methods:

    • Development of a universal theoretical model to describe polarization states within a WRR.
    • Experimental testing of polarization errors using various silica WRRs integrated into an RMOG.
    • Fabrication and characterization of tilted waveguide gratings with Brewster's angle on silica waveguides within the WRR cavity.

    Main Results:

    • The theoretical model accurately predicts polarization errors stemming from the excitation of two polarization states in the WRR.
    • Experimental results with different silica WRRs validate the theoretical predictions.
    • Fabricated tilted waveguide gratings achieved a polarization extinction ratio of 35.2 dB.
    • The proposed method theoretically reduces temperature dependence of polarization error to 0.0019 (°/s)/°C.

    Conclusions:

    • Polarization issues in WRRs are a primary source of bias errors in RMOGs.
    • The developed universal model provides a framework for understanding and addressing these errors.
    • The implementation of tilted waveguide gratings effectively suppresses polarization errors, making temperature control sufficient for tactical-grade RMOGs.