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(a) Schematic demonstration of the physical distances between fiber Bragg gratings (FBGs) in the cyclic transparent amorphous fluoropolymers (CYTOP) fiber. (b) Reflected optical spectrum of the five-sensors FBG array inscribed in 120 µm core diameter, multimode, gradient index CYTOP fiber when illuminated with broadband light source and measured using a commercial FBG spectrometer.
