The fabrication of an eccentric three-core fiber and its application as a twist sensor

Xue, Pingsheng, Liu, Qiang, Wu, Qiang and Fu, Yong Qing (2022) The fabrication of an eccentric three-core fiber and its application as a twist sensor. IEEE Transactions on Instrumentation and Measurement, 71. pp. 1-6. ISSN 0018-9456

IEEE_TIM_final_version.pdf - Accepted Version

Download (2MB) | Preview
Official URL:


The fabrication and application for twist sensing of an eccentric three-core fiber were demonstrated. The fiber was made by stack-and-draw technique, in which silica rods and core canes were put in a tube and drawn on a fiber drawing tower. Three cores formed a Mach-Zehnder interferometer, where the lights transmitted in the three cores interfered with each other, resulted in the formation of envelopes on spectrum. Because two of the cores were off axis, phase differences among the cores varied with twist due to different stretches on each core, which caused shift of the spectral envelopes of the interference signal. Wide range twist measurement can be realized with relatively high sensitivity by tracking lower dips of the envelopes. Experimental results revealed that the dips shift quadratically with twist angle, which means that the sensitivity increases with twist. The compensation of temperature influence was also implemented by inscribing a Bragg grating on one of the cores with femtosecond laser. Because the fiber can be mass-produced, it is suitable for twist sensing in practical application for its low cost.

Item Type: Article
Additional Information: Funding information: This research was funded by the National Natural Science Foundation of China (Grant No. 51907017), the Key Science and Technology Research Projects of Higher Education Institutions in Hebei Province of China (Grant No. ZD2019304), Hebei Natural Science Foundation (Grant No. F2020501040), the Fundamental Research Funds for the Central Universities of China (Grant No. N2123012).
Uncontrolled Keywords: Fiber sensor, Twist, Three-core fiber, Mach-Zehnder interferometer
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 12 Apr 2022 12:01
Last Modified: 18 May 2022 11:30

Actions (login required)

View Item View Item


Downloads per month over past year

View more statistics