FIBER BRAGG GRATING LASER SENSOR

An erbium-doped fiber laser utilizing a broadband mirror as the end re flector and an intracore Bragg grating as the output coupler is design ed and developed. This arrangement is used as a laser sensor to improv e interrogation efficiency of intracore Bragg gratings over broadband sensor interrogation methods. Wavelength tuning of the fiber laser has been achieved by varying the temperature and strain on the Bragg grat ing, demonstrating an improved SNR with respect to the previous techni ques that use broadband interrogation of the Bragg grating sensor.