Tapered single-mode spatially weighted optical fiber vibration sensors

In this paper, we present a weighted Mach-Zehnder interferometric sensor that is used to filter vibration modes in a one-dimensional beam placed in a clamped-free arrangement. The sensitivity of the fiber has been tailored for a specific mode shape of an excited beam by tapering a single mode circular core fiber. Mode suppressions on the order of 4 dB have been demonstrated.