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Simultaneous measurement of temperature and refractive index based on a core-offset Mach-Zehnder interferometer cascaded with a long-period fiber grating

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Abstract

An all-fiber sensor based on a cascaded optical fiber device is proposed and demonstrated, and its sensor head is composed of a core-offset Mach-Zehnder interferometer (MZI) and a long-period fiber grating (LPFG). In the experiment, two dips shaped by the intermodulation between the interference fringe of MZI and the resonant wavelength of LPFG are monitored. Experimental results show that temperature sensitivities of two dips are 0.060 7 nm/°C and 0.056 3 pm/°C, and the refractive index (RI) sensitivities are −18.025 nm/RIU and −55.06 nm/RIU, respectively. The simultaneous measurement of the temperature and external RI is demonstrated based on the sensitive matrix. Its low fabrication cost, simple configuration and high sensitivity make this sensor have potential applications in chemical and biological sensing.

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Authors and Affiliations

  1. Key Laboratory of Film Electronics and Communication Devices, Tianjin University of Technology, Tianjin, 300384, China

    Ye Cao  (曹晔), Hui-ying Liu  (刘慧莹), Zheng-rong Tong  (童峥嵘), Shuo Yuan  (袁硕) & Shun Zhao  (赵舜)

Authors
  1. Ye Cao  (曹晔)
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  2. Hui-ying Liu  (刘慧莹)
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  3. Zheng-rong Tong  (童峥嵘)
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  4. Shuo Yuan  (袁硕)
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  5. Shun Zhao  (赵舜)
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Corresponding author

Correspondence to Hui-ying Liu  (刘慧莹).

Additional information

This work has been supported by the National High Technology Research and Development Program (No.2013AA014200), the National Natural Science Foundation of China (No.61107052), the Natural Science Foundation of Tianjin (No.14JCYBJC16500), and the Tianjin University’s Science and Technology Development Fund Projects (No.2012).

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Cao, Y., Liu, Hy., Tong, Zr. et al. Simultaneous measurement of temperature and refractive index based on a core-offset Mach-Zehnder interferometer cascaded with a long-period fiber grating. Optoelectron. Lett. 11, 69–72 (2015). https://doi.org/10.1007/s11801-015-4127-x

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  • DOI: https://doi.org/10.1007/s11801-015-4127-x

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