Multi-wavelength Brillouin erbium-doped fiber laser sensor with high tunable temperature sensing coefficient

摘要

A multi-wavelength Brillouin erbium-doped fiber laser sensor is proposed and investigated experimentally. It is a linear laser cavity multi-wavelength fiber laser, formed by fixing two high-reflectivity Sangac loop mirrors at both ends. We investigate the laser system output characteristics and test the sensor performance for different temperature. Temperature/humidity and reliable linear-cavity fiber laser sensing operation were successfully achieved. Experimental results show that the temperature sensitivity is 27.15MHz/degrees C and the measurement error caused by frequency drift is about +/- 0.285 degrees C.