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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 7 — Mar. 1, 2001
  • pp: 1011–1020

Multiplexing of Optical Fiber Gas Sensors with a Frequency-Modulated Continuous-Wave Technique

H. B. Yu, W. Jin, H. L. Ho, K. C. Chan, C. C. Chan, M. S. Demokan, G. Stewart, B. Culshaw, and Y. B. Liao  »View Author Affiliations


Applied Optics, Vol. 40, Issue 7, pp. 1011-1020 (2001)
http://dx.doi.org/10.1364/AO.40.001011


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Abstract

We report on the use of a frequency-modulated continuous-wave technique for multiplexing optical fiber gas sensors. The sensor network is of a ladder topology and is interrogated by a tunable laser. The system performance in terms of detection sensitivity and cross talk between sensors was investigated and found to be limited by coherent mixing between signals from different channels. The system performance can be improved significantly by use of appropriate wavelength modulation–scanning coupled with low-pass filtering. Computer simulation shows that an array of 37 acetylene sensors with a detection accuracy of 2000 parts in 10<sup>6</sup> for each sensor may be realized. A two-sensor acetylene detection system was experimentally demonstrated that had a detection sensitivity of 165 parts in 10<sup>6</sup> for 2.5-cm gas cells (or a minimum detectable absorbance of 2.1 × 10<sup>−4</sup>) and a cross talk of −25 dB.

© 2001 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.2630) Fiber optics and optical communications : Frequency modulation
(060.4230) Fiber optics and optical communications : Multiplexing
(300.1030) Spectroscopy : Absorption
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6380) Spectroscopy : Spectroscopy, modulation

Citation
H. B. Yu, W. Jin, H. L. Ho, K. C. Chan, C. C. Chan, M. S. Demokan, G. Stewart, B. Culshaw, and Y. B. Liao, "Multiplexing of Optical Fiber Gas Sensors with a Frequency-Modulated Continuous-Wave Technique," Appl. Opt. 40, 1011-1020 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-7-1011

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