对单包层掺镱光纤的吸收特性进行了实验研究。分析了抽运光功率、掺杂光纤长度以及种子光功率对单包层掺镱光纤吸收能力的影响。研究发现吸收饱和时，抽运光每增加100 mW，掺杂光纤可再吸收40～60 mW的抽运光，且随着抽运光功率的继续增加，吸收系数趋于某一定值；长度越长，吸收饱和情形下掺杂光纤的再吸收能力越强，光纤的吸收系数越大；注入种子光能明显提高掺杂光纤对抽运光的吸收能力。

The absorption characteristics of ytterbium-doped single-cladding fiber are studied experimentally. The effects of pump power, fiber length and seed power on the absorption characteristics are analyzed. The results indicate that, under the situation of absorption saturation, the fiber can resorb 40～60 mW pump power for every 100 mW increase of pump power, and the absorption coefficient tends to a constant with the increase of pump power. The re-absorption capacity and the absorption coefficient of the fiber can be improved with the increase of the fiber length. Besides, it is another way to significantly improve absorption ability of pump light that injecting seed light.