Highly birefringent fiber grating laser sensors based on femtosecond laser-inscribed in-fiber stressors

We propose a novel dual-polarization distributed feedback fiber laser (DFB-FL) sensor based on femtosecond laser-inscribed in-fiber stressors. Simultaneous strain and temperature measurement was demonstrated by detecting the polarization beat frequency and lasing wavelength of the DFB-FL. Experimental results exhibit strain sensitivities of 34.5 kHz/µe, 1.25 pm/µe and temperature sensitivities of 684.6 kHz/°C, 11.5 pm/°C, respectively.