Techwin L-band ASE light sources employ optimized Er-doped fiber laser and realize output laser which are featured by wide spectral, high output power and extremely high stability of the output power within the whole temperature range. Techwin L-band ASE sources have extremely high spectral flatness. Techwin L-band ASE light sources are highly integrated system sources. The benchtop sources uses high-definition LCD which displays the current and voltage synchronously and have continuously tunable output power; suitable for scientific research and manufacturing testing. In addition, Techwin can provide compact module package for system integration.