Hollow-core microstructured optical fiber gas sensors

Fan Yang, Wei Jin, Yuechuan Lin, Chao Wang, Hoi Lut, Yanzhen Tan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

67 Citations (Scopus)


Recent progress in gas detection with hollow-core microstructured optical fibers (HC-MOFs) and direct absorption/photothermal interferometry spectroscopy are reported. For direct-absorption sensors, the issue of mode interference noise is addressed and techniques to minimize such a noise are experimentally demonstrated. Large-scale drilling of hundreds of low-loss micro-channels along a single HC-MOF is performed, and reduction of diffusion-limited response time from hours to ∼40 s is demonstrated with a 2.3-m-long HC-MOF. For photothermal inteferometry sensors, novel detection configurations based on respectively a Sagnac interferometer and an in-fiber modal interferometer are experimentally demonstrated. The Sagnac configuration avoids the need for complex servo-control for interferometer stabilization while the in-fiber configuration simplifies the detection, reducing the size and cost of the sensor system. Sub ppm gas detection can be achieved easily with photothermal interferometry HC-MOF sensors but is difficult to achieve for direct-absorption sensors with the current commercial HC-MOFs.
Original languageEnglish
Article number7742355
Pages (from-to)3413-3424
Number of pages12
JournalJournal of Lightwave Technology
Issue number16
Publication statusPublished - 15 Aug 2017


  • Gas detectors
  • optical fiber applications
  • optical fiber measurements
  • optical fiber sensors
  • optical spectroscopy
  • photothermal interferometry

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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