报道了一种高输出功率、高斜率效率的短腔Er/Yb共掺杂光纤激光器。激光谐振腔由一段Er/Yb共掺杂单模光纤与一对布拉格反射波长相同的光纤布拉格光栅(FBG)组成。反射率为60%的光纤光栅用作光纤激光器谐振腔的输出,3 dB带宽为0.16 nm。反射率为99%的光纤光栅作为高宽带反射腔镜,同时作为抽运光输入端,3 dB带宽1.02 nm。以980 nm激光二极管(LD)作抽运源进行实验。使用不同的抽运功率分别测量不同长度的Er/Yb共掺杂光纤,优化光纤激光器谐振腔得到的最佳长度仅为13 cm。即选用13 cm Er/Yb共掺杂光纤作为增益介质来制作短腔Er/Yb光纤光栅激光器,最大输出功率可达11 mW,输出功率稳定性<±0.01 dB,抽运阈值功率为35 mW,斜率效率为15.3%,测量其1552.2 nm激光的输出光谱,25 dB线宽为0.3 nm,边模抑制比>60 dB,波长稳定性为0.05 nm。可用于密集波分复用(DWDM)系统。

A short cavity Er/Yb co-doped fiber laser of high output power and high slope efficiency is demonstrated. Its resonant cavity is composed of a section of single mode Er/Yb co-doped fiber and two fiber Bragg gratings with the same reflection wavelength. A fiber grating is used for output of resonant cavity with 60% reflectivity. Its 3 dB-bandwidth is measured as 0.16 nm. The other fiber grating is used for high broadband reflector and input of pump light with 99% reflectivity. Its 3 dB-bandwidth is measured as 1.02 nm. This fiber laser is pumped by a 980 nm semiconductor laser. Meanwhile, the Er/Yb co-doped fiber with different lengths is measured by different pump power, and the optimized length of the fiber is only 13 cm. A short cavity fiber grating laser is done by using 13 cm Er/Yb co-doped fiber as gain medium. Its maximum output power is 11 mW and its power stability is better than ±0.01 dB. The laser has a threshold of 35 mW and a slope efficiency of 15.3%. Its 1552.2 nm output spectral 25 dB-bandwidth is measured as 0.3 nm. Edge-mode suppression ratio >60 dB has been achieved and its wavelength stability is 0.05 nm. This fiber laser is able to be used for dense-wavelength-division-multiplex (DWDM) system.