18 May 2011 Simple CW correlation OTDR for interrogation of multiplexed low-reflectivity FBG sensors
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Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77538V (2011) https://doi.org/10.1117/12.886084
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada
Abstract
We propose a very simple technique for multiplexing and interrogation of Fiber Bragg Gratings using a DFB diode laser operating in CW mode. The technique is based on correlation detection of probe signals reflected by the fiber Bragg gratings. Phase noise of the DFB diode laser converted into intensity noise was used as a probe signal. Demultiplexing was performed by calculating the correlation between the probe signal and the signal reflected by the fiber. The correlation function provide the reflectivity at the probe wavelength and position of each fiber Bragg gating. Reflection spectra of FBGs can be obtained by tuning the diode laser wavelength with temperature and calculating the correlation function for each probe wavelength. Results of experimental verification of the technique are presented.
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M. G. Shlyagin, A. Arias, "Simple CW correlation OTDR for interrogation of multiplexed low-reflectivity FBG sensors", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77538V (18 May 2011); doi: 10.1117/12.886084; https://doi.org/10.1117/12.886084
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