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High-sensitive fiber-optic refractometer based on a core-diameter-mismatch mach-zehnder interferometer

  • Qiangzhou Rong
  • , Xueguang Qiao
  • , Ruohui Wang
  • , Hao Sun
  • , Manli Hu
  • , Zhongyao Feng
  • Northwest University China

Research output: Contribution to journalArticlepeer-review

87 Scopus citations

Abstract

An in-fiber Mach-Zehnder interferometer (MZI) for high-sensitive refractive index (RI) measurement is proposed and experimentally demonstrated. The sensing head is formed by a single-mode fiber (SMF) sandwiched between two short sections of thin-core fibers (TCFs), i.e., TCF-SMF-TCF MZI configuration with a length of 9 mm. A well-defined interference pattern is obtained as the result of fiber-core mismatch and core-cladding modes interference. The selected interference dip is extremely sensitive to ambient RI, providing a stable RI response with sensitivity up to 159 nm/RIU for water-based solutions close to the RI of 1.33, making it a good candidate for bio-chemical measurements.

Original languageEnglish
Article number6183456
Pages (from-to)2501-2505
Number of pages5
JournalIEEE Sensors Journal
Volume12
Issue number7
DOIs
StatePublished - 2012
Externally publishedYes

Keywords

  • Fiber optics
  • fiber optics sensors

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