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Multimode optical fibers support the dense, low-loss transmission of manyspatial modes, making them attractive for technologies such as communicationsand imaging. However, information propagating through multimode fibers isscrambled, due to modal dispersion and mode mixing. This is usually rectifiedusing wavefront shaping techniques with devices such as spatial lightmodulators. Recently, we demonstrated an all-fiber system for controlling lightpropagation inside multimode fibers using mechanical perturbations, called thefiber piano. In this tutorial we explain the design considerations andexperimental methods needed to build a fiber piano, and review applicationswhere fiber pianos have been used.

Tutorial: How to build and control an all-fiber wavefront modulator using mechanical perturbations