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Proceedings Paper

Fibre optic gyroscope with single-mode fibre and loop-back phase shift compensation
Author(s): Michal Skalský; Zdeněk Havránek; Jiří Fialka
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Paper Abstract

An all-fibre optical sensor of an angular velocity (fibre-optic gyroscope) based on the Sagnac interferometer and using a loop-back phase shift compensation is presented. The sensing loop consists of 760 metres of an ordinary single-mode fibre, which makes this setup cost-effective. To ensure principles of beams reciprocity, randomly induced changes of polarization in the fibre are reduced by using an unpolarized light. This is achieved by a fibre Lyot depolarizer and a super fluorescent fibre source consisting of an erbium-doped fibre pumped by a laser diode. Unlike common approaches to the unpolarized fibre-optic gyroscope with a single-mode fibre, whose output is naturally nonlinear, we use a loop-back compensation of a rotation-induced phase shift to achieve a linear response. In most cases, this technique requires fast electro-optical modulator, which is compatible only with an expensive polarization-maintaining fibre. We use a novel loop-back modulation scheme utilizing only harmonic signals and thus compatible with a piezoelectric fibre stretcher, which can be used with any kind of optical fibre. As result of the closed-loop operation, the range of the gyroscope's linearity is greatly increased and a sensitivity to source power changes is suppressed. We describe the gyroscope setup with proposed modulation method and provide a comparison to the common open-loop setup.

Paper Details

Date Published: 1 December 2017
PDF: 6 pages
Proc. SPIE 10603, Photonics, Devices, and Systems VII, 1060309 (1 December 2017); doi: 10.1117/12.2292298
Show Author Affiliations
Michal Skalský, Brno Univ. of Technology (Czech Republic)
Zdeněk Havránek, Brno Univ. of Technology (Czech Republic)
Jiří Fialka, Brno Univ. of Technology (Czech Republic)


Published in SPIE Proceedings Vol. 10603:
Photonics, Devices, and Systems VII
Karel Fliegel; Petr Páta, Editor(s)

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