A simple and precise method for tuning of localized phase shift in fiber Bragg grating (FBG) using mechanical microstrain is proposed and experimentally verified. Positive and negative continuous phase shifts tuning between 0 and +π/−π in a uniform FBG is experimentally demonstrated using confined micro-strain in a beam bending configuration. The magnitudes of the temporary phase shifts can be linearly controlled by changing the load displacement, with set-and-forget capability.

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In this paper, we propose and demonstrate a simple and accurate fiber Bragg grating (FBG) phase shift tuning system using mechanical micro-strain. Continuous phase shift tuning between 0 and π in FBGs based on a low-cost beam bending package is experimentally established. The results indicate that the magnitude of the temporary phase shifts can be easily reconfigured by adjusting the travel distance of a micrometer screw.