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Point sensor. Experiment setup of the humidity sensor. (POF: polymer optical fiber; OVDL: optical variable delay line; PC: polarization controller; EDFA: erbium-doped fiber amplifier; MZM: Mach-Zehnder modulator; SMF: single-mode fiber; PD: photodetector; OSA: optical spectrum analyzer; VNA: vector network analyzer). Reprinted with permission from ref. [200]. Copyright 2021 Elsevier.
