Techwin C+L-band ASE light sources of 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 C+L-band ASE sources have extremely high spectral flatness,less than 5dB. Techwin C+L-band ASE light sources are a highly integrated system sources. The benchtop sources use high-definition LCD which displays the current and voltage synchronously and has continuously tunable output power; suitable for scientific research and manufacturing testing. In addition, Techwin can provide compact module package for system integration.