Modified sensing element of a fibre-optic current sensor based on a low-eigenellipticity spun fibre

Journal Article · Fri Oct 31 04:00:00 EDT 2014 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2014V044N10ABEH015387· OSTI ID:22373356

Przhiyalkovsky, Ya V; Morshnev, S K; Starostin, N I; Gubin, V P ^[1]

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1. V.A.Kotel'nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Fryazino branch, Fryazino, Moscow Region (Russian Federation)

We have proposed and investigated a modified sensing element of a spun fibre current sensor for the case when the beat length of the built-in linear birefringence of the fibre is equal to or less than the spin pitch of its helical structure. The proposed configuration makes it possible to restore the interferometer contrast reduced because of the decrease in the ellipticity of the wavelength-averaged polarisation state of radiation propagating in such spun fibre. The modified sensing element contains two polarisation state converters: one, located at the spun fibre input, produces polarisation with ellipticity equal to the eigenellipticity of the fibre, and the other ensures conversion of the elliptical polarisation to an orthogonal one through mirror reflection at the fibre output. We have also demonstrated that the magneto-optical sensitivity decreases slightly for the analysed spectrum-averaged parameters of the polarisation state of radiation in the spun fibre. Experimental data lend support to the theoretical predictions. (fibre-optic sensors)

• OSTI ID: 22373356
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Journal Name: Quantum Electronics (Woodbury, N.Y.) Journal Issue: 10 Vol. 44; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BIREFRINGENCE
INTERFEROMETERS
MIRRORS
OPTICAL FIBERS
POLARIZATION
REFLECTION
SENSITIVITY
SENSORS