The ASE-FL7701 is an ultra-wideband ASE light source covering all of the S-, C- and L-bands. Tm-doped fluoride fibers, Er-doped fluoride fibers, and Er-doped silica fibers are combined to achieve spectral power density of -20 dBm/nm over a wide wavelength range between 1460 and 1605 nm. The ultra-wideband light source can be used as a light source for characterization of optical devices for WDM and transmission systems and optical component for CWDM. The gain-flattened model, option -032, is available with 5 pcs MOQ.