Stable　high-power　operation　of　an　all-fiber　broadband　superfluorescent　source,　based　on　ytterbium-doped　double-cladding　fibers,　is　achieved　via　a　fiber　amplifier.　It　comprises　an　amplified　spontaneous　emission　(ASE)　seed　source　which　is　amplified　to　over　one　hundred　watts　in　the　next　stage　for　a　single　pass,　with　no　self-pulsing,　relaxation　oscillation　or　lasing　modes　being　observed.　The　center　wavelength　of　ASE　seed　source　is　1050　nm,　and　the　full　width　half　maximum　(FWHM)　is　21　nm.　The　maximum　superfluorescent　output　power　yielded　by　the　amplifier　is　102　W,　the　slope　efficiency　with　respect　to　the　pump　power　is　70%,　and　FWHM　of　the　emission　spectrum　is　20.5　nm.