“…Similar to silica optical fibers, polymer optical fibers (POFs) have several advantages, such as small footprint, immunity to electromagnetic interference, and multiplexing capabilities [1,2]. Moreover, due to unique advantages, such as low Young's modulus, large negative thermo-optic coefficients, high elastic strain limits, and high bending flexibility, POFs present superior characteristics for sensing applications [1,[3][4][5][6][7]. Though a variety of polymer materials with specific advantages have been used for POF fabrication, such as biocompatible polymethyl methacrylate (PMMA) [8,9], cyclic olefin copolymers (TOPAS) with low water absorption [10], cyclic-olefin polymer (ZEONEX) with high glass transition temperature (T g ) [11,12], polycarbonate (PC) with excellent clarity and engineering strength [13], and cyclic transparent amorphous fluoropolymers (CYTOP) with low losses [14], polymethyl methacrylate (PMMA) is still the most prevailing material [8].…”