Compact assembly-free vector bend sensor based on all-in-fiber-core Mach-Zehnder interferometer

Chen, Pengcheng, Shu, Xuewen and Sugden, Kate (2018). Compact assembly-free vector bend sensor based on all-in-fiber-core Mach-Zehnder interferometer. Optics Letters, 43 (3), pp. 531-534.


A novel low-cost, compact, assembly-free and sensitive optical fiber curvature sensor is presented. This device consists of an off-axis positive refractive index modified zone (PRIMZ), induced by direct femtosecond laser, written in single mode fiber (SMF) core. The PRIMZ transforms the original SMF section into a few-mode fiber (FMF). As a result, the whole fiber forms an assembly-free “SMF-FMF-SMF” sandwich Mach-Zehnder interferometer. When the device is bent, a direction dependent spectral shift of the interference pattern is produced. The sensitivity of the sensor is up to 2.53 and 2.24nm/m-1 for the 0° and 180° orientations in a wide bend range (from 0-4m-1). In addition, the device is immune to surrounding refractive index and has low temperature crosstalk, which make it very attractive for practical structural monitoring applications.

Publication DOI:
Divisions: Engineering & Applied Sciences > Electrical, electronic & power engineering
Engineering & Applied Sciences > Institute of Photonics
Additional Information: © 2018, Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited. Funding: National Natural Science Foundation of China (NSFC) (61775074); National 1000 Young Talents Program, China; 111 Project (No. B07038); Natural Science Foundation of Guangdong Province, China (2015A030313633).
Uncontrolled Keywords: All-optical devices; ,Optical sensing and sensors;, Optical design and fabrication; ,Optical devices;, Interferometry
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Related URLs: https://www.osa ... uri=ol-43-3-531 (Publisher URL)
Published Date: 2018-01-29
Authors: Chen, Pengcheng
Shu, Xuewen
Sugden, Kate ( 0000-0001-6323-1082)



Version: Accepted Version

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