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PTICAL HETERODYNE GYROSCOPE USING TWO REVERSED FIBER COILS

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Abstract

In a fiber-optic gyroscope optical heterodyne detection techniques are suited to obtain a stable scale factor and a linear output of the Sagnac phase shift, as well as a wide dynamic range to detect the rotation rate1). Nevertheless, it is rather hard to contrive a clever fiber-optic system by which a stable output is produced in the presence of environmental noise factors. For example, the presence of frequency difference between the two optical waves counterpropagating in a fiber coil yields a phase bias in the heterodyne output, which is a factor fluctuating the phase output2). Another fluctuating factor also arises from the separate paths transmitted by the two counterpropagating optical waves3). In order to overcome such problems, a novel heterodyne detection scheme was proposed previously4). The proposed system incorporated an orthogonally polarized two -frequency laser beam in conjunction with a single fiber-optic interferometric system using a polarization-maintaining single-mode fiber-coil. However, it was soon proved that the mode coupling effect between the orthogonal components guided in the fiber coil was an unavoidable fluctuating factor in the gyroscope operation. In this paper another novel scheme is proposed to avoide such drawbacks. Two reversed fiber coils play an essential role in the proposed scheme.

© 1988 Optical Society of America

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