High Sensitivity Refractive Index Sensor Based on the Cascaded Long-Period Fiber Grating near the Dispersion Turning Point

Abstract

We demonstrate the fabrication of refractive index sensor based on the cascaded long- period fiber grating near dispersion turning point. The measured refractive index sensitivity is up to 2095.9 nm/RIU in the RI range of 1.333-1.395.