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20 October 2017 Research on dual-parameter optical fiber sensor based on few-mode fiber with two down-tapers
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A dual-parameter optical fiber sensor, which is fabricated by sandwiching a segment of few-mode fiber (FMF) with two down-tapers between two segments of standard single-mode fibers (SMFs), is investigated theoretically and experimentally. The two down-tapers on the FMF can enhance the evanescent field, making the sensor more sensitive to changes in the external environment. The refractive index (RI) and temperature are measured simultaneously using the different sensitivities of the two dips in this experimental interference spectrum. The measured temperature sensitivities are 0.097 and 0.114  nm/°C, and the RI sensitivities are −97.43 and −108.07  nm/RIU, respectively. Meanwhile, the simple SMF-FMF-SMF structure is also measured. By comparing the experimental results of the two structures, the sensitivities of the proposed structure based on the dual-taper FMF are significantly improved. In addition, the sensor is easy to fabricate and cost effective.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2017/$25.00 © 2017 SPIE
Xue Wang, Zhengrong Tong, Weihua Zhang, and Lifang Xue "Research on dual-parameter optical fiber sensor based on few-mode fiber with two down-tapers," Optical Engineering 56(10), 107108 (20 October 2017).
Received: 25 May 2017; Accepted: 21 September 2017; Published: 20 October 2017

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