High-Sensitivity Temperature Sensor Based on a Selectively-Polymer-Filled Two-Core Photonic Crystal Fiber In-Line Interferometer


A highly sensitive temperature sensor based mostly on an all-fiber Mach–Zehnder interferometer employing a selectively polymer-crammed two-core photonic crystal fiber is experimentally demonstrated. The sensor fiber was made by the manual gluing and subsequent infiltration of polymer; the cladding air holes surrounding one core were selectively crammed with a polymer material with a high thermo-optic (TO) coefficient whereas leaving those of the opposite core unfilled, and this led to the massive TO mismatch between 2 cores. It was found from measurements that a terribly high temperature sensitivity of one.595 nm/°C might be achieved, that was additional than two orders of magnitude over that of the sensor fiber before the selective filling process.

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