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Sensors 2017, 17(11), 2674; https://doi.org/10.3390/s17112674

A Loop All-Fiber Current Sensor Based on Single-Polarization Single-Mode Couplers

1
Department of Electronic Information Science, Fujian Jiangxia University, Fuzhou 350007, China
2
Fujian Provincial Key Laboratory for Photonics Technology, Fujian Normal University, Fuzhou 350007, China
3
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
4
Academy of OPTO-electronics, Chinese Academy of Science, Beijing 100094, China
*
Authors to whom correspondence should be addressed.
Received: 8 October 2017 / Revised: 8 November 2017 / Accepted: 16 November 2017 / Published: 20 November 2017
(This article belongs to the Section Physical Sensors)
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Abstract

Low current sensitivity and insufficient system stability are two key problems in all-fiber current sensor (AFCS) studies. In order to solve the two problems, a novel AFCS combining single-polarization single-mode (SPSM) couplers and a loop structure is presented in this paper with a design that incorporates the advantages of both SPSM couplers and a loop structure. SPSM couplers are shown to simplify the AFCS system and reduce the risk of interference, and the loop structure can enhance the current sensitivity. Both theory and experiment prove that the new AFCS can simultaneously overcome two prevalent obstacles of low current sensitivity and low stability. View Full-Text
Keywords: fiber current sensors; single-polarization single-mode; fiber loop; ortho-conjugate retroreflector; system stability fiber current sensors; single-polarization single-mode; fiber loop; ortho-conjugate retroreflector; system stability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Zhang, H.; Jiang, J.; Zhang, Y.; Chen, H.; Zhao, N.; Lin, L.; Qiu, Y. A Loop All-Fiber Current Sensor Based on Single-Polarization Single-Mode Couplers. Sensors 2017, 17, 2674.

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