High Sensitivity Optical Fiber Curvature Sensor Based on Cascaded Fiber Interferometer

Shandong Dong, Bo Dong, Changyuan Yu, Yongxin Guo

Research output: Journal article publicationJournal articleAcademic researchpeer-review

64 Citations (Scopus)


A highly sensitive optical fiber curvature sensor based on cascaded fiber interferometers (CFIs) is demonstrated theoretically and experimentally. Theoretical results show that the scheme of cascaded fiber interferometers can be regarded as an equivalent fiber interferometer with longer interference length and narrower FSR. It serves as a curvature sensor with sensitivity up to 4.362 nm/m-1 within the measurement range of 0-1.134 m-1. Compared to the single fiber modal interferometer, the curvature sensitivity of the CFI is almost doubled. In addition, simultaneous curvature and temperature measurement is achieved using the coefficient matrix method, eliminating the issue of temperature cross sensitivity.

Original languageEnglish
Pages (from-to)1125-1130
Number of pages6
JournalJournal of Lightwave Technology
Issue number4
Publication statusPublished - 15 Feb 2018


  • Cascaded fiber interferometer
  • curvature
  • fiber interferometer
  • fiber sensor
  • temperature

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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