Narrow Linewidth Fiber Grating F-P Cavity Laser and Application

Narrow line-width fiber grating 1535 nm erbium laser was demonstrated by introducing fiber grating F-P cavity. It was composed by high Er³⁺ doped fiber, 980/1550 nm WDM and fiber grating F-P cavity. Linear and ring cavity experiments were demonstrated respectively. In the experiment, pumped by 976 nm diode laser, the associated fiber lasers with frequency selecting by fiber grating F-P cavity exhibited about 11 mW threshold. 15% and 30% slope efficiency were obtained respectively in the experiments. The 3 dB line-width of fiber lasers were both less than 0.01 nm, and SNR were both about 50 dB. Narrow linewidth fiber laser can be used to build distributed fiber optical sensor systems. Frequency modulated continuous wave (FMCW) technique and Brillouin optical fiber time domain reflectometry (BOTDR) technique were described in this paper