This paper describes a fiber optic strain sensor array using a tunable multi-wavelength fiber ring laser in which fiber Bragg gratings (FBGs) are used as wavelength selection components in the ring cavity. Since the oscillation wavelengths of the laser are determined by the Bragg wavelengths of the FBGs and depend on the strains applied to the FBGs, simultaneous multi-point strain measurement is realized by monitoring the oscillation wavelengths of the laser. In the experiment, a stable multi-wavelength laser is fabricated by employing a semiconductor optical amplifier (SOA) and simultaneous multi-point strain measurements are demonstrated with higher resolution and S/N ratio.

© 2010 Optical Society of America

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