“…Some polymers, such as PMMA, are humidity sensitive and strongly absorb water 9 , while other polymers, for instance TOPAS and Zeonex, are insensitive to humidity [10][11][12] . Exploiting such unique and intrinsic properties of POFs, researchers in this area have developed different single parameter POFBG sensors such as strain, temperature, humidity, pressure and soon [13][14][15][16][17] . Only little work has been done in the development of multi-parameter POFBG sensors.…”