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Proceedings Paper

Multiplexing FBG-based sensors using unmodulated continuous wave DFB diode laser
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Paper Abstract

We present an inexpensive technique capable to interrogate multiplexed sensors based on ultra-low-reflective Bragg gratings written in a long standard telecom fiber. The technique is suitable for distributed detection and localization of disturbances in security and early warning systems for pipeline monitoring, in linear temperature sensors for fire detectors, etc. It is based on the correlation OTDR principle measuring cross-correlation between a noise-like probe signal and the signal reflected back from the sensing fiber. In order to simplify the sensor configuration, an unmodulated CW DFB diode laser was used as a light source. A noise-like probe signal was generated by conversion of phase noise of the DFB laser into intensity noise with a help of unbalanced Michelson interferometer. Results of the experimental verification of the proposed technique are presented.

Paper Details

Date Published: 9 May 2011
PDF: 6 pages
Proc. SPIE 8073, Optical Sensors 2011; and Photonic Crystal Fibers V, 80731Y (9 May 2011); doi: 10.1117/12.887142
Show Author Affiliations
A. Arias, Ctr. de Investigación Científica y de Educación Superior de Ensenada (Mexico)
M. G. Shlyagin, Ctr. de Investigación Científica y de Educación Superior de Ensenada (Mexico)
S. V. Miridonov, Ctr. de Investigación Científica y de Educación Superior de Ensenada (Mexico)


Published in SPIE Proceedings Vol. 8073:
Optical Sensors 2011; and Photonic Crystal Fibers V
Kyriacos Kalli; Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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