利用掺镱双包层光纤, 建立了一套全光纤结构超荧光光纤光源的实验系统。研究了在正向泵浦情况下, 单程双向输出超荧光光源的特性, 并讨论了不同长度掺镱光纤对超荧光光源性能的影响。实验结果表明, 反向输出超荧光光源具有更高的效率和更宽的带宽。当增益光纤长度较短时, 其激光振荡阈值更高, 可产生更高的输出功率; 而当增益光纤长度增加后, 虽然最大输出功率下降, 但其能产生更宽的输出光谱。

Based on a segment of Ytterbium-doped dual-cladding fiber (YDF), an all-fiber superfluorescent fiber source (SFS) experimental system is demonstrated. The characteristics of double-ended output SFS is researched under forward pump condition. And the effects of YDF with different length on the performances of SFS are discussed. Experimental result shows that backward output SFS has higher conversion efficiency and broader bandwidth. When the length of gain fiber becomes shorter, the laser oscillation threshold is higher and thus higher output power can be obtained. With the increasing of gain fiber length, the maximum output power decreases, but the bandwidth of the output spectrum increases at the same time.