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9 May 2011 Multiplexing FBG-based sensors using unmodulated continuous wave DFB diode laser
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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.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Arias, M. G. Shlyagin, and S. V. Miridonov "Multiplexing FBG-based sensors using unmodulated continuous wave DFB diode laser", Proc. SPIE 8073, Optical Sensors 2011; and Photonic Crystal Fibers V, 80731Y (9 May 2011);

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