We demonstrate a nonlinear fiber-optic strain sensor, which uses the shifts of four-wave mixing Stokes and anti-Stokes peaks caused by the strain-induced changes in the structure and refractive index of a microstructured optical fiber. The sensor thus uses the inherent nonlinearity of the fiber and does not require any advanced postprocessing of the fiber. Strain sensitivity of $-0.23\mathrm{pm}/\mathrm{\mu \epsilon }$ is achieved experimentally and numerical simulations reveal that for the present fiber the sensitivity can be increased to $-4.46\mathrm{pm}/\mathrm{\mu \epsilon }$ by optimizing the pump wavelength and power.

© 2012 Optical Society of America

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