“…Optical fiber-based sensors have attracted much attention due to their unique advantages [12,13,14,15,16], such as compact size, immunity to electromagnetic interference, and fast response time, which are based on a variety of principles and structures, such as fiber gratings, fiber lasers, fiberoptic interferometers, etc. Therefore, they have widely been used to monitor the temperature [12], the curvature [16], the gas [15], etc. [17].…”