Dual demodulation of temperature and refractive index using ring core fiber based mach-zehnder interferometer

Weihao Yuan, Changyuan Yu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)


We report the ring core fiber spliced with single mode fiber and no core fiber which is used for temperature and refractive index (RI) sensing. The Mach-Zehnder interferometer (MZI) is formed with this kind of sandwich fiber structure and the maximum extinction ratio of the interference spectra reaches 27 dB with the free spectra range of 12 nm. The MZI fiber sensor is applied for temperature sensing with the sensitivity of 69 pm/ C and 0.051 dB/ C. The RI sensitivity reaches 182.07 dB/RIU and −31.44 nm/RIU with the RI ranging from 1.33 to 1.38. The RI value can be directly demodulated with the interference dip intensity which shows insensitivity to temperature. The demodulation of temperature can be achieved by using the linear equations between dip wavelength shift with the variation of temperature and RI.

Original languageEnglish
Article number258
Pages (from-to)1-8
Number of pages8
Issue number3
Publication statusPublished - Mar 2021


  • Mach-Zehnder interferometer
  • Refractive index
  • Ring core fiber
  • Temperature

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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