Simultaneous directional curvature and temperature sensor based on a tilted few-mode fiber Bragg grating

Yunhe Zhao, Changle Wang, Guolu Yin, Biqiang Jiang, Kaiming Zhou, Chengbo Mou, Yunqi Liu, Lin Zhang, Tingyun Wang

Research output: Contribution to journalArticle

Abstract

We demonstrate a directional curvature sensor based on tilted few-mode fiber Bragg gratings (FM-FBGs) inscribed by a UV laser. The eigenmodes of LP01LP01 and LP11LP11 mode groups are simulated along with the fiber bending. The directional curvature sensor is based on the LP11LP11 mode resonance in the tilted FM-FBG. For curvature from 4.883 to 7.625  m−17.625  m−1, the curvature sensitivities at direction of 0° and 90° are measured to be −2.67−2.67 and 0.128  dB/m−10.128  dB/m−1, respectively. The temperature variation barely affects the resonance depth of LP11LP11 mode. The proposed curvature sensor clearly demonstrates the potential to simultaneous directional curvature and temperature measurement with the resolutions of 9.15×10−4  m−19.15×10−4  m−1 and 0.952°C, respectively.
Original languageEnglish
Pages (from-to)1671
JournalApplied Optics
Volume57
Issue number7
Early online date29 Jan 2018
DOIs
Publication statusPublished - 28 Feb 2018

Keywords

  • Fiber Bragg gratings
  • Fiber optics sensors

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