紧凑型窄线宽分布反馈光纤激光器

 在铒/镱共掺杂有源光纤上直接刻蚀光栅，制成一台紧凑型非对称π相移分布反馈光纤激光器。光栅总长度约50 mm，最佳相移位置在29 mm处，最佳耦合系数为150 m^-1。采用980 nm激光二极管同向泵浦，当最大泵浦功率为200 mW时，在1 550.94 nm处实现约10 mW激光输出，线宽小于0.05 nm，阈值约35 mW，斜率效率为6.06%，总光 光转换效率为5%，基本满足长距离光通信系统光源功率实用化的要求。

Compact narrow-width distributed feedback fiber laser

Directly etching an active grating in Er/Yb codoped fiber, a compact asymmetric π phase-shifted fiber laser was fabricated. The designed grating length is only 50 mm, the optimal phase shift position is at 29 mm, and the optimal coupling coefficient value is 150 m－1 . Adopting forward pumped manner by 980 nm LD, when pumped power was of 200 mW, at 1 550.94 nm we have achieved the narrow-band laser output of 10 mW, its width was narrower than 0.05 nm, the threshold was 35 mW, the slope efficiency was 6.06%, total optical conversion efficiency was 5%. The fiber laser has met the practicality of light sources' power in the long-term optical communications system．