A plastic filament of poly (methyl methacrylate) (PMMA) was fabricated by extrusion.\nThe mode confinement was simulated using numerical software. The idea is to study how the light\nintensity changes inside the plastic optical fiber (POF) when a bending in multiple directions is\napplied. The results obtained from the simulation were compared to the experimental observations.\nThe non-circular shape of the POF allows sensing a rotation applied as well. The angle of rotation was\nobtained processing two images of the end facet of the fiber (one with the fiber in a reference position\nand one with the rotated fiber), using an intensity-based automatic image registration.
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