ASE light source adopts optimized erbium-doped fiber laser optical path coupled with 980nm single-mode pump laser to achieve high performance output. This ASE light source is a highly integrated system sources with high stability, can be offered in small module, standard module or 2U-A benchtop enclosure to meet different needs of users. The 2U-A benchtop enclosure is equipped with LCD display to show real-time current and voltage, and continuous tuning of output power can be achieved.