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Multimode optical fibers excited with coherent light generate an output speckle pattern (specklegram) due to the interference between numerous guided modes. Albeit undesirable in optical communication systems, specklegrams carry rich, reproducible information about the fiber state. Such a feature allows applications in imaging, light analysis, and fiber sensing [1][2]; the latter correlates speckle field changes with physical and chemical measurands.
© 2022 Japan Society of Applied Physics, Optica Publishing Group
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