Abstract

The performance of a highly sensitive strain sensor based on nonlinear four-wave mixing (FWM) using a fiber Bragg grating (FBG) is investigated. The power change due to the wavelength shift induced by very small strain over the FBG is significantly magnified by a higher order FWM process. Strain sensitivity of $5.547\mathrm{dBm}/\mathrm{\mu ϵ}$ is achieved and minimum wavelength shift of $2.18\times {10}^{-6}\mathrm{nm}$ (which corresponds to a strain of $1.80\times {10}^{-3}\mathrm{\mu ϵ}$) is detected with uniform FBG, whereas in case of chirped FBG (CFBG) strain sensitivity of $0.3\mathrm{dBm}/\mathrm{\mu ϵ}$ with minimum detectable wavelength shift of $4\times {10}^{-5}\mathrm{nm}$ (which corresponds to a strain of $0.033\mathrm{\mu ϵ}$) is obtained.

© 2018 Optical Society of America

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