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3 February 1999 Behavior of the lock-in phenomenon and a way to overcome it using the Brillouin fiber optic gyro
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Abstract
Brillouin Fiber Optic Gyro (B-FOG) can detect angular velocity from the beat frequency between the two lasing Stokes lights that circulate in opposite directions in the fiber ring resonator. This means the B-FOG has inherently the beat output format suitable for navigation applications. However, B-FOG has a serious problem called 'lock-in phenomenon'. In lower rotation rate, frequency pulling effect occurs between the two Stokes lights due to backscattering in the resonant, and the beat signal is getting distorted and finally locked to zero. In this report, at first, we realize B-FOG and observe its output characteristics, including optical Kerr-effect induced bias and the lock-in phenomenon. Then, the details of the lock-in phenomenon are evaluated theoretically. Additionally, we propose a novel method to avoid the lock-in phenomenon by modulating the gyro output through the optical Kerr-effect in the fiber resonator. Finally, we verify this method experimentally.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kazuo Hotate and Shinji Yamashita "Behavior of the lock-in phenomenon and a way to overcome it using the Brillouin fiber optic gyro", Proc. SPIE 3541, Fiber Optic and Laser Sensors and Applications; Including Distributed and Multiplexed Fiber Optic Sensors VII, (3 February 1999); https://doi.org/10.1117/12.339113
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