中文摘要：

掺铒光纤ASE源是一种优良的宽带光源，受到人们广泛关注。实验研究了掺铒光纤ASE宽带光源单、双程结构后向ASE输出光谱特性，当泵浦光中心波长为1480nm时，分别考察了掺铒光纤长度、泵浦光功率对后向ASE输出平坦区间宽度和平坦度的影响。通过对两种结构下后向ASE输出光谱的分析比较发现，双程结构在L波段长波长处，尤其是1570～1620nm波长范围，功率显著提升，从而使得ASE光谱的平坦区间宽度增大，平坦度提高。所得实验结果将为掺铒光纤ASE宽带光源的研制提供依据。

英文摘要：

ASE broadband light source based on erbium-doped fiber （EDF）, as an excellent broadband light source, has attracted much attention. The output spectral characteristics of ASE broadband light source based on EDF with single- and double-pass configurations are respectively investigated experimentally. With the central pump wavelength of 1480 nm, the influences of EDF length and pump power on output spectral width and flatness are studied for both the single- and double-pass configuration ASE sources. It is found that the power of ASE source located in the L-band, especially in the wavelength range of 1570～1620 nm, for the double-pass configuration may be enhanced, giving a wider and flatter spectrum in whole C- and L.bands by comparing to the output spectra for the single-pass configuration. All the experimental results will be helpful for the developments of ASE broadband light source.