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Sensors 2018, 18(1), 278; https://doi.org/10.3390/s18010278

Highly Sensitive Strain Sensor Based on a Novel Mach-Zehnder Interferometer with TCF-PCF Structure

State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, 932 South Lushan Street, Changsha 410083, China
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Received: 30 November 2017 / Revised: 26 December 2017 / Accepted: 16 January 2018 / Published: 18 January 2018
(This article belongs to the Special Issue Integrated Photonic Technologies for Sensing Applications)
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Abstract

A highly sensitive strain sensor based on a novel fiber in line Mach-Zehnder interferometer (MZI) was demonstrated experimentally. The MZI was realized by splicing a section of photonic crystal fiber (PCF) with the same length of thin core fiber (TCF) between two single mode fibers (SMFs). The fringe visibility of MZI can reach as high as 20 dB in air. In particular, the strain sensitivity of −1.95 pm/με was achieved within a range from 0 to 4000 με. Furthermore, the strain properties of different length of MZI was investigated. It was found that the sensitivity was weekly dependent on the length of MZI. The strain sensitivities corresponding to the MZI with 35 mm PCF, 40 mm PCF and 45 mm PCF at 1550 nm band were −1.78 pm/με, −1.73 pm/με and −1.63 pm/με, respectively. Additionally, the sensor has advantages of simple fabrication, compact size and high sensitivity as well as good fringe visibility. View Full-Text
Keywords: Mach-Zehnder interferometer (MZI); photonic crystal fiber (PCF); thin core fiber (TCF); strain sensor Mach-Zehnder interferometer (MZI); photonic crystal fiber (PCF); thin core fiber (TCF); strain sensor
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Dong, X.; Du, H.; Luo, Z.; Duan, J. Highly Sensitive Strain Sensor Based on a Novel Mach-Zehnder Interferometer with TCF-PCF Structure. Sensors 2018, 18, 278.

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