Publication detail

Fibre optic gyroscope with single-mode fibre and loop-back phase shift compensation

SKALSKÝ, M. HAVRÁNEK, Z. FIALKA, J.

Original Title

Fibre optic gyroscope with single-mode fibre and loop-back phase shift compensation

Type

conference paper

Language

English

Original 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.

Keywords

fibre-optic sensors, fibre-optic gyroscope, Sagnac interferometer unpolarized light, piezoelectric modulator, closed-loop

Authors

SKALSKÝ, M.; HAVRÁNEK, Z.; FIALKA, J.

Released

1. 12. 2017

Publisher

SPIE

Location

Prague; Czech Republic

ISBN

9781510617025

Book

Proceedings of SPIE

Edition

Photonics, Devices, and Systems VII.

Edition number

10603

ISBN

0277-786X

Periodical

Proceedings of SPIE

Year of study

10603

State

United States of America

Pages from

1

Pages to

6

Pages count

6

BibTex

@inproceedings{BUT144021,
  author="Michal {Skalský} and Zdeněk {Havránek} and Jiří {Fialka}",
  title="Fibre optic gyroscope with single-mode fibre and loop-back phase shift compensation",
  booktitle="Proceedings of SPIE",
  year="2017",
  series="Photonics, Devices, and Systems VII.",
  journal="Proceedings of SPIE",
  volume="10603",
  number="10603",
  pages="1--6",
  publisher="SPIE",
  address="Prague; Czech Republic",
  doi="10.1117/12.2292298",
  isbn="9781510617025",
  issn="0277-786X"
}