期刊
IEEE SENSORS JOURNAL
卷 20, 期 13, 页码 7074-7081出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2020.2978533
关键词
Mach-Zehnder interferometer; multicore fiber; etching technique
资金
- Major Technique Innovation Program of Hubei Province of China [2018AAA016]
- National Natural Science Foundation of China [51975442]
We propose and demonstrate Mach-Zehnder interferometer (MZI), which is the refractive index (RI) insensitive and temperature highly sensitive based on etched multi-core fiber (MCF) structure. The MCF and Fiber Bragg Grating (FBG) are used as hybrid sensing elements. The fabrication of the interferometer is provided a new taper-like structure by etching the MCF to further expose the side cores to the surroundings. The interferometer has produced a sensitivity of 103.2pm/degrees C within the ambient temperature up-to 70 degrees C. Moreover, the superior temperature sensitivity is 89.19pm/degrees C, 66.64pm/degrees C, 56.42pm/degrees C in the range of 24 degrees C to 130 degrees C, and RI-insensitive in the range of 1.34 to 1.38, for different waists of etched seven-core fiber interferometers (E7CFIs) similar to 84.70 mu m, 93.10 mu m , 108.67 mu m , respectively. Compared with the conventional FBGs, the sensitivity of the interferometer is significantly improved by 8 times. E7CFI's novel and advantageous features can easily be distinguished other devices. Besides, the proposed sensing architecture is compact, easy to fabricate, highly sensitive, easy to reproduce, and makes it an inexpensive fiber optic device.
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