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Opt Lett. 2013 Jul 1;38(13):2327-9. doi: 10.1364/OL.38.002327.

Recovering a fiber Bragg grating axial strain distribution from its reflection spectrum.

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Photonics Engineering Group, University of Cantabria, Av. Los Castros, Santander 39005, Spain.


A processing scheme able to obtain any arbitrary intragrating strain distribution of a fiber Bragg grating (FBG) is proposed and demonstrated. The processing method employs just the intensity of the FBG reflection spectrum to obtain its deformation profile by combining a geometrical processing scheme with the particle swarm optimization technique. The technique has been evaluated using several spectra generated from very heterogeneous strain distributions and with a real spectrum obtained from a 5 mm length FBG under an asymmetric perturbation. The achieved results exhibit a good spatial resolution (Δ≈0.5 mm) and repeatability.


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