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

Michal Skalský; Zdeněk Havránek; Jiří Fialka

doi:10.1117/12.2292298

1 December 2017 Fibre optic gyroscope with single-mode fibre and loop-back phase shift compensation

Michal Skalský, Zdeněk Havránek, Jiří Fialka

Proceedings Volume 10603, Photonics, Devices, and Systems VII; 1060309 (2017) https://doi.org/10.1117/12.2292298
Event: Photonics Prague 2017, 2017, Prague, Czech Republic

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.

Citation Download Citation

Michal Skalský, Zdeněk Havránek, and Jiří Fialka "Fibre optic gyroscope with single-mode fibre and loop-back phase shift compensation", Proc. SPIE 10603, Photonics, Devices, and Systems VII, 1060309 (1 December 2017); https://doi.org/10.1117/12.2292298

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available