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Opt Express. 2013 Jul 29;21(15):18152-9. doi: 10.1364/OE.21.018152.

Microwave assisted reconstruction of optical interferograms for distributed fiber optic sensing.

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Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA.


This paper reports a distributed fiber optic sensing technique through microwave assisted separation and reconstruction of optical interferograms in spectrum domain. The approach involves sending a microwave-modulated optical signal through cascaded fiber optic interferometers. The microwave signal was used to resolve the position and reflectivity of each sensor along the optical fiber. By sweeping the optical wavelength and detecting the modulation signal, the optical spectrum of each sensor can be reconstructed. Three cascaded fiber optic extrinsic Fabry-Perot interferometric sensors were used to prove the concept. Their microwave-reconstructed interferogram matched well with those recorded individually using an optical spectrum analyzer. The application in distributed strain measurement has also been demonstrated.

[Indexed for MEDLINE]

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