The silica based Tm3+ doped fiber preform with high Ge concentration in preform core area was manufactured by solution doping method. It was made into an optic fiber preform with cross section of a hexagon by side polishing process, and drawn in to cladding pumping Tm3+ doped fiber with inner coverage layer of lower refraction index polymer. The absorption spectrum was measured, and the technical parameters were optimized. The uniform fiber Bragg gratings with reflectivity of 90% and 40% were written in both ends of the fiber by UV light respectively, and the linear optic cavity was constructed. The laser with wavelength of 1947.1031nm and power of 2.05W was emitted by pump laser excited with wavelength of 793nm and power of 5.6W. It shows that the fiber have excellent optical characteristics.