光电子快报(英文版), 2019, 15 (1): 39, Published Online: Apr. 11, 2019
Research on SFTS structure based optical fiber sensor
This work has been supported by the Tianjin Natura the Opened Fund of the State Key Laboratory on Int and the National Natural Science Foundation for Yo
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.
TONG Zheng-rong, SUN Li-li, QIN Juan, ZHANG Wei-hua. Research on SFTS structure based optical fiber sensor[J]. 光电子快报(英文版), 2019, 15(1): 39.