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Biconical-taper-assisted fiber interferometer with modes coupling enhancement for high-sensitive curvature measurement

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Abstract

A modal interferometer based on multimode–singlemode–multimode fiber structure built with a biconical taper for fiber curvature measurement is proposed and experimentally demonstrated. Due to the tapered singlemode fiber acting as a high-efficient mode power converter to enhance the modes coupling, curvature sensor with improved sensitivity is achieved by monitoring the defined fringe visibility of the interference spectrum. The measuring range can be tuned by changing the waist diameter of the fiber taper. Meanwhile, the sensor shows an intrinsic ability to overcome the influence of temperature cross-sensitivity and the power fluctuation of light source. The advantages of easy fabrication, high-quality spectrum with improved sensitivity, and small hysteresis will provide great potential for practical applications of the sensor.

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Acknowledgments

This work was supported by State Key Program of National Natural Science Foundation of China (No. 60937002), sub-Project of the Major Program of the National Natural Science Foundation of China (No. 61290315), the National Natural Science Foundation of China (No. 61275004), the sub-Project of National High Technology Research and Development Program of China (863 Program) (No. 2012AA041203), and the Special Foundation for Sensor Research of Huazhong University of Science and Technology.

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Authors and Affiliations

  1. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China

    Jianghai Wo, Qizhen Sun, Xiaolei Li & Deming Liu

  2. National Engineering Laboratory for Next Generation Internet Access System, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China

    Jianghai Wo, Qizhen Sun, Xiaolei Li, Deming Liu & Perry Ping Shum

  3. Aston Institute of Photonic Technologies, Aston University, Birmingham, B4 7ET, UK

    Qizhen Sun

  4. OPTIMUS Centre, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 639798, Singapore

    Perry Ping Shum

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  1. Jianghai Wo
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  2. Qizhen Sun
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  3. Xiaolei Li
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  4. Deming Liu
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  5. Perry Ping Shum
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Correspondence to Qizhen Sun.

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Wo, J., Sun, Q., Li, X. et al. Biconical-taper-assisted fiber interferometer with modes coupling enhancement for high-sensitive curvature measurement. Appl. Phys. B 115, 1–8 (2014). https://doi.org/10.1007/s00340-013-5565-4

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  • DOI: https://doi.org/10.1007/s00340-013-5565-4

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