提出了利用光纤环形镜和高反射率光纤光栅做腔镜的F P腔掺镱光纤激光器的优化设计结构。光纤环形镜的宽带反射特性使抽运光能够充分被介质吸收，提高激光器的转化效率；其反射率可调特性容易得到最佳耦合输出比，当光纤长度改变时，不必更换输出腔镜就可以得到最佳功率输出。光纤长度7 m，抽运功率51 mW时，激光器输出功率为5.65 mW，斜率效率为19%。与其他结构光纤激光器相比，这种优化结构效率更高。

Simple and efficient F-P Yb-doped fiber laser with fiber tunable reflectivity loop mirror and fiber Bragg grating as cavity mirrors is brought forward. A polarization controller is twined in the loop mirror and the optimum output ratio can be obtained easily, and the trouble of selection of different reflectivity output mirror is avoided. Also fiber loop mirror has wideband reflective spectrum, which can improve the pump efficiency and give more output power. The output power of 5.65 mW, slope efficiency of 19% are obtained when pump power is 51 mW and fiber length is 7 m.