Optical sources at 1.7 μm region of optical coherent tomography (OCT) can reduce scattering and absorption in tissue, and enhance the imaging depth. A 300 m long high nonlinear optical fiber and a 10 km long dispersion shifted fiber are pumped by amplified spontaneous emission (ASE) beam to generate continuous spectrum. The continuous light source at peak wavelength of 1675 nm and 10 dB linewidth of 75 nm can be achieved after erbium-doped fiber absorption, by adjusting the peak wavelength and power of the tunable filter after ASE source. In order to improve OCT signal sensitivity without increasing the optical illumination power, a multi-wavelength broadband light source with 14 nm period is obtained by adding a Sagnac filter. The optical sources at the 1.7 μm region is achieved by the proposed method. Experimental results can provide reference for OCT new light source and 1.7 μm region fiber laser.