In-fiber modal interferometer for high sensitivity gas detection

Fan Yang, Wei Jin

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)


We demonstrate a gas sensor based on mode interference in a hollow-core photonic bandgap fiber. Gas absorption of a pump laser beam induces phase modulation of a propagating probe beam, which is detected by use of an in-fiber modal interferometer. An estimated detection limit of 2 ppm acetylene (7x10-5 in terms of noise equivalent absorbance or NEA) is achieved with 30-cm-long HC-PBF operating at the near infrared wavelength. This NEA is 22 times better than state-of-the-art HC-PBF gas sensors based on direct absorption spectroscopy.
Original languageEnglish
Title of host publication24th International Conference on Optical Fibre Sensors, OFS 2015
ISBN (Electronic)9781628418392
Publication statusPublished - 1 Jan 2015
Event24th International Conference on Optical Fibre Sensors, OFS 2015 - Pestana Hotel and Convention Centre, Curitiba, Brazil
Duration: 28 Sep 20152 Oct 2015


Conference24th International Conference on Optical Fibre Sensors, OFS 2015


  • Gas sensor
  • Interference
  • Microstructured fiber
  • Optical fiber sensor
  • Photonic bandgap fiber
  • Photonic crystal fiber
  • Photothermal effect

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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