研究了结构新颖的环形腔铒／镱(Er／Yb)共掺双包层光纤激光器．为了获得高功率激光输出，使用6个激光二极管(LD)同时抽运Er／Yb共掺光纤，采用光纤光栅(FBG)Sagnac环作为波长选择器，得到了中心波长为1548．11nm、谱线宽度为0．06nm的窄线宽激光输出；并利用增益光纤作为可饱和吸收体，实现了自调Q、自锁模脉冲输出．当抽运功率为719mW时，激光器输出自调Q脉冲，脉冲周期为20μs，脉冲宽度为2．8μs，脉冲的平均功率为38．4mW，峰值功率为274．3mW；当抽运功率为3．6W时，激光器输出自锁模脉冲，脉冲宽度为4ns，平均功率为319mW，脉冲峰值功率大于10W，重复频率为7．937MHz．

A novel narrow line-width Erbium/Ytterbium (Er/Yb) co-doped double-clad fiber ring laser has been reported. To obtain higher output power,the laser is pumped by six Continuous Wave Laser Diodes (LD) operating at 976 nm through six pigtails of a Tapered Fiber Bundle connected with the Er/Yb codoped fiber. By using fiber Bragg grating (FBG) Sagnac loop mirror as a wavelength-selective device,the cladding-pumped fiber laser oscillation with a line-width of 0.06 nm and central wavelength of 1548.11 nm has been obtained. By using the saturable absorption of an un-pumped Er/Yb co-doped double-clad fiber,with different pump power,such laser can operate at different modes. The self-Q-switched pulse with pulse width of 2.8 μs,period of 20 μs and average power of 38.4 mW can be achieved at the pump power of 719 mW. And the peak power of the Self-Q-switching pulse is 274.3 mW. When the pump power is 3.6 W,the maximum peak power of the self-mode-locked pulse reaches 10 W with a repetition rate of 7.937 MHz and duration of 4ns. As no active element is inside the cavity,this fiber ring laser potentially has many advantages over conventional pulsed fiber laser systems.