12 November 1996 Closed-loop operation in the resonator fiber optic gyro using Faraday effect with a twisted single-mode fiber resonator
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Abstract
To operate the R-FOG with a good linearity in a wide dynamic range, a closed-loop operation is required, in which the phase difference generated by the Sagnac effect between the counter propagating lights in the resonator is compensated by some method. So far, the phase compensation is done by making frequency difference between the two lights using frequency shifters, such as acousto-optic modulators. For a middle grade and low cost R-FOG, however, the removal of expensive devices and simpler configuration are preferable, and the complicated mechanism for the closed-loop operation should be removed. In this paper, we propose a novel method for the closed-loop operation using Faraday effect as an unreciprocal physical effect to the counter-propagating lights in the resonator. This method has a simple configuration and never needs expensive devices.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Toshiharu Ito, Kazuo Hotate, "Closed-loop operation in the resonator fiber optic gyro using Faraday effect with a twisted single-mode fiber resonator", Proc. SPIE 2837, Fiber Optic Gyros: 20th Anniversary Conference, (12 November 1996); doi: 10.1117/12.258186; https://doi.org/10.1117/12.258186
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KEYWORDS
Resonators

Polarization

Birefringence

Fiber optic gyroscopes

Gyroscopes

Kerr effect

Modulation

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