A novel fiber-optic intra-cavity sensing network using a mode-locked fiber ring laser

H. B. Yu, Wei Jin, Y. B. Liao, G. Stewart, B. Culshaw, H. L. Ho, Y. H. Li

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

5 Citations (Scopus)


A promising method for high sensitivity gas detection is intra-cavity spectroscopy (V.M. Baev et al., Applied Physics vol. B55, pp. 463-477, 1992), where the gas absorber is placed directly within a laser cavity. The high sensitivity arises from the very large number of passes through the gas cell within the cavity, effectively transforming a short absorption cell into a highly efficient multi-pass system. As a consequence a weak gas absorption line can have an enormous impact on the laser output. Recently intra-cavity spectroscopy with fiber lasers has attracted considerable attention. An all-fiber intra-cavity laser system can use the mature passive and active fiber components from the communications market with compact micro-optic gas cells, allowing safe, remote and continuous gas monitoring. In this paper, we present a system that combines a mode-locked fiber ring laser with intra-cavity spectroscopy to distinguish between different gas cells in a ladder sensing network. The system outputs strong pulsed lasing signals only when certain matching conditions are satisfied (J.S. Wey et al., IEEE Photonics Tech. Lett., vol. 7, no. 2, pp. 152-154, 1995) and individual sensors are addressed by different frequencies of the mode-locked fiber ring laser.
Original languageEnglish
Title of host publication2002 15th Optical Fiber Sensors Conference Technical Digest, OFS 2002
Number of pages4
ISBN (Electronic)0780372891, 9780780372894
Publication statusPublished - 1 Jan 2002
Event15th Optical Fiber Sensors Conference Technical Digest, OFS 2002 - Hilton Portland, Portland, United States
Duration: 6 May 200210 May 2002


Conference15th Optical Fiber Sensors Conference Technical Digest, OFS 2002
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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