• Optoelectronics Letters
  • Vol. 15, Issue 1, 39 (2019)
Zheng-rong TONG*, Li-li SUN, Juan QIN, and Wei-hua ZHANG
Author Affiliations
  • Tianjin Key Laboratory of Film Electronic and Communication Devices, School of Electrical and Electronic Engi-neering, Tianjin University of Technology, Tianjin 300384, China
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    Abstract

    A single-mode-few-mode-thin-core-single-mode (SFTS) structure based optical fiber sensor is fabricated and experi-mentally studied. The sensing principle relies on the inter-modal interference. Since the core diameter of few-mode fi-ber (FMF) is larger than that of single-mode fiber (SMF), the FMF helps to allow more light to enter the cladding of thin-core fiber (TCF), which helps TCF to excite cladding modes. The interference between core and cladding modes in TCF occurs at the joint of lead-out SMF and TCF. Experimental results demonstrate a refractive index (RI) sensitiv-ity of .103.34 nm/RIU and a temperature sensitivity of 0.05 nm/℃. The proposed sensor not only can measure tem-perature, but also can measure RI. In addition, the proposed sensor is simple for without complicated fabrication proc-ess.
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    TONG Zheng-rong, SUN Li-li, QIN Juan, ZHANG Wei-hua. Research on SFTS structure based optical fiber sensor[J]. Optoelectronics Letters, 2019, 15(1): 39
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    Received: May. 21, 2018
    Accepted: Jul. 13, 2018
    Posted: Jan. 1, 2019
    Published Online: Apr. 11, 2019
    The Author Email: Zheng-rong TONG (tjtongzhengrong@163.com)