A polarimetric current sensor using an orthogonally polarized dual-frequency fibre laser

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We demonstrate a novel Er3+-doped fibre laser operating in orthogonally polarized dual-frequency modes and its application to electric current sensing with frequency read-out. A Faraday rotating mirror and spatial hole burning effects in a gain medium and in a saturable absorber are utilized to control the lasing mode and polarization. The polarization mode beat frequency changes linearly in response to the non-reciprocal circular birefringence induced by an external magnetic field. When the laser was applied to sensing an alternating electric current with a simple phase-locked loop signal processing scheme, the slope coefficient of 8.0 kHz A(p-p)(-1), per turn and the noise equivalent current of 460 mu A(rms) HZ(-1/2) per turn were obtained. The new current sensor is immune to perturbations in the lead fibres.
Publisher
IOP PUBLISHING LTD
Issue Date
1998-06
Language
English
Article Type
Article
Citation

MEASUREMENT SCIENCE TECHNOLOGY, v.9, no.6, pp.952 - 959

ISSN
0957-0233
DOI
10.1088/0957-0233/9/6/012
URI
http://hdl.handle.net/10203/19283
Appears in Collection
PH-Journal Papers(저널논문)
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