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An ultra-short wavelength operation of Tm-doped all fiber laser based on fiber Bragg gratings(FBGs)was developed and the laser yielded 3.15W of continuous-wave output at 1706.75nm with a narrow-linewidth of~47pm and a maximum slope efficiency of 42.1%.A bi-directional pump configuration for the ultra-short wavelength operation was designed and investigated for the first time.