In-line Mach-Zehnder interferometer with D-shaped fiber grating for temperature-discriminated directional curvature measurement


A high-sensitivity curvature sensing configuration is implemented by using a fiber Mach-Zehnder interferometer (MZI) with D-shaped fiber Bragg grating (FBG). A segment of D-shaped fiber is fusion spliced into a single mode fiber at both sides, and then a short FBG is inscribed in the D-shaped fiber. The fiber device yields a significant spectrum sensitivity as high as 87.7 nm/m<formula><tex>$^-1$</tex></formula> to the ultra-low curvature range from 0 to 0.3 m<formula><tex>$^-1$</tex></formula>, and can distinguish the orientation of curvature experienced by the fiber as the attenuation dip producing either a blue or red wavelength shift, by virtue of the asymmetry of D-shaped fiber cladding. In addition, by tracking both resonant wavelengths of the MZI and embedded FBG, the temperature and curvature can be measured simultaneously.

Publication DOI:
Divisions: Engineering & Applied Sciences > Electrical, Electronic & Power Engineering
Engineering & Applied Sciences > Aston Institute of Photonics Technology
Uncontrolled Keywords: curvature measurement,D-shaped fiber,fiber Bragg grating (FBG),Fiber gratings,Mach-Zehnder interferometer (MZI),Optical fiber sensors,Optical fibers,Temperature measurement,Temperature sensors,Atomic and Molecular Physics, and Optics
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2017-11-24
Published Online Date: 2017-11-24
Accepted Date: 2017-11-24
Authors: Jiang, Biqiang
Bai, Zhiyong
Wang, Changle
Zhao, Yunhe
Zhao, Jianlin
Zhang, Lin ( 0000-0002-1691-5577)
Zhou, Kaiming ( 0000-0002-6011-1912)



Version: Accepted Version

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