Aiming at improving the sensing system compatiblity and anti-jamming ability,in the loop cavity of fiber-laser,based on the F-P resonator comprised of FBGS to interrogate sensors and the central wavelength tuned by the beam elements is proposed and demonstrated.The all-optics sensing system has the advantages of high resolution,low inserting loss and compatible completely. When the sensing signal of the FBG is locked,the feedback system can track and demodulate it automatically. To confirm the theory,using a sensing and demodulation gratings that get the laser output at the central wavelength 1554.32 nm which is fit with our target.