Multimode microfiber interferometer for dual-parameters sensing assisted by Fresnel reflection

Qizhen Sun, Haipeng Luo, Hongbo Luo, Macheng Lai, Deming Liu, Lin Zhang

Research output: Contribution to journalArticlepeer-review


A compact and low cost fiber sensor based on single multimode microfiber with Fresnel reflection is proposed and demonstrated for simultaneous measurement of refractive index and temperature. The sensor is fabricated with two simple steps including fiber tapering and then fiber endface cleaving. The reflection spectrum is an intensity modulated interference spectrum, as the tapered fiber generates interference pattern and the cleaved endface provides intensity modulation. By demodulating the fringe power and free spectrum range (FSR) of the spectrum, RI sensitivities of -72.247dB/RIU and 68.122nm/RIU, as well as temperature sensitivities of 0.0283dB/degrees C and -17pm/degrees C are obtained. Further, the sensing scheme could also provide the feasibility to construct a more compact sensing probe for dual-paramters measurement, which has great potential in bio/chemical detection.
Original languageEnglish
Pages (from-to)12777-12783
Number of pages7
JournalOptics Express
Issue number10
Early online date7 May 2015
Publication statusPublished - 18 May 2015


  • refractive-index sensor
  • Mach-Zehnder interferometer
  • photonic crystal fiber
  • optical microfiber
  • pressure sensor
  • temperature
  • silica
  • probe


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