Investigation of interferometric noise in fiber-optic gas sensors with use of wavelength modulation spectroscopy

Wei Jin, Y. Z. Xu, M. S. Demokan, G. Stewart

Research output: Journal article publicationJournal articleAcademic researchpeer-review

29 Citations (Scopus)


We report on interferometric noise limitation of fiber-optic gas sensors with highly coherent lasers and wavelength modulation spectroscopy. Interference between signal wave and reflected waves causes signal fluctuation in the output, which limits the performance of the sensing system. Sensor resolution limited by interferometric noise is calculated for a fiber-optic gas sensor with the Q(6) absorption line of methane gas at approximately 1650 nm. The results are useful for system designers of this particular type of gas sensor.
Original languageEnglish
Pages (from-to)7239-7246
Number of pages8
JournalApplied Optics
Issue number28
Publication statusPublished - 1 Oct 1997


  • Fiber-optic sensors
  • Gas sensors
  • Interferometric noise

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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