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Mode coupling coefficient in chalcogenide-glass multimode fibers in the midinfrared

The optical power distribution along step index As2Se3 chalcogenide-glass multimode fibers in the mid IR region was studied experimentally. The experimental set-up consists of an Ir source with collimating and focusing optics, and step index As2Se3 multimode fibers in different lengths. The far field radiation intensity of the fiber was obtained by moving an MCT detector with different band pass filters on an arc centered at the fiber exit.