All-fiber modal interferometer based on an up-taper-core-offset structure for curvature sensing

doi:10.1088/1674-1056/24/4/044202

Abstract A high-sensitivity curvature sensor based on an up-taper-core-offset structure is proposed and demonstrated in this paper. Here two specially designed cascaded up-tapers with maximum diameters of 247 μm and 251 μm, respectively, are used as a cladding mode exciting component. The excited cladding modes will propagate in the cladding and re-couplers with the core mode at the core-offset jointing point. When the curvature is changed, the dip wavelength of the sensor will shift to a blue wavelength and an average curvature sensitivity of more than -12.5 nm/m^-1 is achieved within the measured curvature intervals.

Keywords: curvature sensor up-taper core-offset modal interferometer

Received: 28 August 2014
Revised: 03 October 2014
Accepted manuscript online:

PACS:	42.25.Hz	(Interference)
	42.79.Pw	(Imaging detectors and sensors)

Corresponding Authors: Ma Lin, Qi Yan-Hui
E-mail: lin.ma.wf@gmail.com;11111012@bjtu.edu.cn

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Ma Lin (马林), Qi Yan-Hui (齐艳辉), Sun Jiang (孙将), Kang Ze-Xin (康泽新), Jian Shui-Sheng (简水生) All-fiber modal interferometer based on an up-taper-core-offset structure for curvature sensing 2015 Chin. Phys. B 24 044202

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[1]	Switchable multi-wavelength fiber laser based on modal interference Ma Lin (马林), Sun Jiang (孙将), Qi Yan-Hui (齐艳辉), Kang Ze-Xin (康泽新), Jian Shui-Sheng (简水生). Chin. Phys. B, 2015, 24(8): 084201.

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All-fiber modal interferometer based on an up-taper-core-offset structure for curvature sensing

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