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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.The dependencies of the slope efficiencies and pump threshold of the laser versus the length of active fiber and reflectivity of the output mirror(FBG)were investigated in detail.It is indisputable that the development of 1.7μm silicate fiber lasers with Wattlevel output power open up a number of heart-stirring and tempting application windows.