Bragg grating in a polymer optical fibre for strain, bend and temperature sensing

We report on a Bragg grating written in an eccentric-cored polymer optical fibre for measurement of strain, bend and temperature. The strain sensitivity achieves 1.13 pm mu epsilon(-1). The temperature response shows a negative sign with the thermal sensitivity of -50.1 pm degrees C-1. For bend sensing, this device exhibits a strong fibre orientational dependence, wide bend curvature range of +/- 22.7 m(-1) and a high bend sensitivity of 63.3 pm/m(-1).