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

Biqiang Jiang, Zhiyong Bai, Changle Wang, Yunhe Zhao, Jianlin Zhao, Lin Zhang, Kaiming Zhou

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Number of pages6
JournalJournal of Lightwave Technology
Early online date24 Nov 2017
DOIs
Publication statusPublished - 24 Nov 2017

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

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