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Current sensing utilizing heterodyne detection of the Faraday effect in single-mode optical fiber

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2 Author(s)
Kersey, A. ; Naval Research Laboratory, Washington, DC, USA ; Jackson, D.A.

A fiber-optic current sensor based on the Faraday effect is described which utilizes laser-diode frequency modulation in order to synthesize a heterodyne-type sensor output. The relative phase of the output carrier is directly modulated by the magnetically induced circular polarization mode-phase delay. Current sensing over three orders of magnitude is demonstrated, and a Verdet constant of 2.57 \times 10^{-6} rad/A (at 0.83μm) is reported for the fiber used.

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Lightwave Technology, Journal of  (Volume:4 ,  Issue: 6 )