Showing papers by "Mikhail G. Shlyagin published in 2011"
TL;DR: In this paper, an inexpensive technique capable to interrogate multiplexed sensors based on ultra-low-reflective Bragg values written in a long standard telecom fiber is presented, which is suitable for distributed detection and localization of disturbances in pipeline monitoring, in linear temperature sensors for fire detectors, etc.
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.