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    Area of Science:

    • Optics and Photonics
    • Inertial Navigation Systems
    • Laser Technology

    Background:

    • Polarization decoherence in optical gyroscopes can lead to noise and reduced accuracy.
    • Coherent polarization crosstalk is a significant noise source in differential frequency-modulated continuous-wave (FMCW) gyroscopes.
    • Existing methods for noise suppression may not fully address coherent crosstalk.

    Purpose of the Study:

    • To analyze the impact of coherent polarization crosstalk noise on differential FMCW gyroscopes.
    • To propose and demonstrate a novel method for suppressing coherent polarization crosstalk noise.
    • To evaluate the effectiveness of the proposed method in reducing random drift.

    Main Methods:

    • Development of a differential frequency-modulated continuous-wave (FMCW) gyroscope.
    • Analysis of coherent polarization crosstalk noise mechanisms.
    • Implementation of a novel technique to generate two incoherent orthogonal polarization narrow-band beams from a laser diode.
    • Experimental evaluation of the gyroscope's performance with the proposed noise suppression method.

    Main Results:

    • The impact of coherent polarization crosstalk noise on the differential FMCW gyroscope was thoroughly analyzed.
    • A novel method successfully produced two incoherent orthogonal polarization narrow-band beams.
    • The proposed method effectively suppressed coherent polarization crosstalk noise.
    • Random drift of the gyroscope was reduced by approximately one order of magnitude.

    Conclusions:

    • Coherent polarization crosstalk noise is a critical factor affecting differential FMCW gyroscope performance.
    • The novel method of generating incoherent orthogonal polarization beams is effective in suppressing this noise.
    • This approach significantly enhances the accuracy and stability of FMCW gyroscopes, paving the way for improved inertial navigation.