We　report　high-power　all-fiber　superfluorescent　source　based　on　ytterbium-doped　double-cladding　fibers　(DCFs).　This　was　achieved　via　an　all-fiber　master　oscillator　power　amplifier　(MOPA)　configuration　which　consisted　of　a　broadband　amplified　spontaneous　emission　(ASE)　seed　source　and　a　stage　of　fiber　power　amplifier.　A　considerable　single-pass　gain　up　to　29.4dB　was　achieved　in　the　amplification　stage　without　self-pulsing,　relaxation　oscillation　or　longitudinal　mode　competition.　The　emission　spectrum　was　centered　at　1043nm　with　the　full　width　half　maximum　(FWHM)　bandwidth　20.5nm.　The　maximum　output　power　yielded　by　the　amplifier　was　102W　with　slope　efficiency　70%.　Further　improvements　in　power　scaling　are　attainable　by　use　of　additional　cascaded　fiber　amplifiers.　Various　applications　of　high-power　superfluoresecent　fiber　source　(SFS)　are　to　be　explored.