Stimulated Brillouin scattering (SBS) management in kilowatt level, high brightness, narrow spectral width, and allpolarization-maintained amplifiers by using laser gain competition is demonstrated. This method can increase the SBSthreshold of the fiber amplifier by more than twice without changing the linewidth. By further incorporating phasemodulation technique, the SBS threshold is scaled to be as high as 32.4 times compared with single frequencyamplification. Output power of 1082 W is achieved with polarization extinction ratio (PER) of ～ 14 dB, linewidth of<7.6 GHz and beam quality (M~2 factor) of ～M~2=1.14 in a preliminary validation experiment. This kind of fiber sourcehas great potential in the applications of high power coherent beam combining (CBC) or spectral beam combining (SBC)systems.
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