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Magnetic field sensing based on singlemode–multimode–singlemode fiber structures using magnetic fluids as cladding

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Abstract

Magnetic field sensing based on magnetic fluid (MF) and a singlemode–multimode–singlemode (SMS) fiber structure is proposed. The sensitivity of the proposed sensing system can be enhanced by corroding the cladding of the multimode fiber of the SMS fiber structure. The achieved maximum magnetic field sensitivity of our experimental structures is 16.86pm/Oe as the fiber is corroded for 1680 s. The visibility of the interference dip for the MF-clad SMS fiber structure decreases with corrosion time. Considering the trade-off between sensitivity and visibility, the figure of merit of the sensing system is employed to evaluate the sensing performance comprehensively. In our experiments, the structure corroded for 1620s is found to have maximum sensing performance.

© 2013 Optical Society of America

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