为了获得尽可能高的输出功率以满足应用需求，分别以实验和数值分析的方法对铒镱共掺双包层光纤激光器的性能进行了进一步研究。实验上，采用加拿大国家光学研究所生产的EY805型铒镱共掺双包层多模光纤作为增益介质，描述了输出功率随入纤抽运功率以及光纤长度的变化，在光纤长度为1．8m的情况下，获得了3．5W的最大输出功率，光－光转换效率达31．8%。基于速率和传输方程，对该铒镱共掺双包层光纤激光器进行了数值模拟，在相同光纤长度下，计算的最大输出功率约4．4W，光－光转换效率40%，比实验结果要高。讨论了进一步对该光纤激光器性能进行优化的措施。该结果对于促进铒镱共掺双包层光纤激光器的实用化及其性能改进具有重要意义。

In order to achieve much higher output power to satisfy the application requirements,the performances of erbium/ytterbium co-doped double-cladding fiber lasers(EY-DCFLs)are studied experimentally and theoretically. By using the EY805 model erbium/ytterbium co-doped multi-mode double-cladding fiber manufactured by INO,Canada as the gain medium,it is described that the output power is a function of the input pump power and fiber length. The maximum output power is about 3.5 W by using a 1.8m fiber,with an optical to optical conversion efficiency of 31.8% . Numerical analysis of this EY-DCFL is also performed based on the rate and propagation equations. The calculated output powers of about 4.4W and conversion efficiency of 40% for the same fiber are a little larger than the experimental results . Then further optimization measures of the EY-DCFL are discussed,such as preparing of the fiber-end well,adding dichroic mirror at the output end and making fiber Bragg gratings directly in the fiber core. The above results are very important for the utilization and performance improvement of EY-DCFL.