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Distributed sensor. (a) Conceptual design of the sensing fiber. Inset: cross-section view of the polyelectrolyte coating. (b) Left: Scanning electron microscope image of the exposed-core fiber cross-section. Right: simulated mode profile in the core. (c) Splice sequence of the sensing fiber with an exposed-core fiber (ECF), a graded-index fiber (GIF), and a single-mode fiber (SMF). Reprinted with permission from ref. [227]. Copyright 2019 IEEE.
