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Related Experiment Video

Updated: Jun 19, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

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Published on: February 28, 2016

Lock-in reduction technique for fiber-optic ring laser gyros.

S Huang, K Toyama, B Y Kim

    Optics Letters
    |October 6, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We developed a Brillouin fiber-optic gyro using push-pull phase modulation to prevent frequency locking. This innovation significantly reduces the lock-in range, enhancing gyro performance for precise navigation.

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    Area of Science:

    • Optics and Photonics
    • Fiber Optic Sensors
    • Inertial Navigation

    Background:

    • Brillouin fiber-optic gyroscopes (BFOGs) are crucial for high-precision rotation sensing.
    • Frequency locking, a phenomenon that limits BFOG performance, occurs when the beat frequency approaches zero.
    • Existing methods to mitigate frequency locking often add complexity or compromise system performance.

    Purpose of the Study:

    • To demonstrate a novel method for suppressing frequency locking in Brillouin fiber-optic gyros.
    • To achieve an all-fiber system with optical reciprocity.
    • To experimentally validate the effectiveness of the proposed technique.

    Main Methods:

    • Implementation of a push-pull phase modulation scheme within the fiber optic ring cavity.
    • Utilizing an in-line modulation approach to maintain optical reciprocity.
    • Experimental measurement of the lock-in range width before and after applying the modulation.

    Main Results:

    • Successful suppression of frequency locking was achieved.
    • The implemented system demonstrated all-fiber construction with optical reciprocity.
    • A tenfold reduction in the width of the lock-in range was experimentally observed.

    Conclusions:

    • The push-pull phase modulation technique effectively suppresses frequency locking in Brillouin fiber-optic gyros.
    • This method enables a practical all-fiber solution for high-performance rotation sensing.
    • The demonstrated reduction in lock-in range width significantly enhances the operational range and accuracy of BFOGs.