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 journalArticlepeer-review

56 Scopus citations

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-1 to the ultralow curvature range from 0 to 0.3 m-1, 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
Article number8119788
Pages (from-to)742-747
Number of pages6
JournalJournal of Lightwave Technology
Volume36
Issue number3
DOIs
StatePublished - 1 Feb 2018

Keywords

  • Curvature measurement
  • D-shaped fiber
  • fiber Bragg grating (FBG)
  • Mach-Zehnder interferometer (MZI)

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