Since 2008, the Association for Research and Use of Fiber Optics and Guided Optics (ARUFOG Association ) has been actively investigating the application of optical fibers as sensing elements within the framework of the GO2S (Guided Optics & Sensor Systems) initiative. This special issue, from the very first day of the second quarter, explores advances in intrinsic optical sensing technologies distributed along optical fibers, collectively known as distributed fiber optic sensors (DFOS)

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