Polarimetric Fiber Laser Sensor with Enhanced Sensitivity by Utilizing a Hi-Bi EDF

We propose a polarimetric fiber laser sensor with enhanced sensitivity by utilizing a high birefringence Erbium doped fiber (Hi-Bi EDF) and beat frequency demodulation. The strain and temperature sensing tests are carried out by monitoring the frequency difference between two adjacent polarimetric mode beat frequencies. The fiber laser sensor exhibits a high temperature sensitivity of 99.61 MHz/°C and a high strain sensitivity of 1.405 MHz/με, which are 2~3 orders of magnitude higher than those of its counterparts presented in previous literature.