A light source system includes: a plurality of gain mediums configured to output a corresponding plurality of lights having different center wavelengths from each other; a first light source part configured to connect the plurality of gain mediums to each other in parallel and emit the plurality of lights; a wavelength-swept filter unit configured to sweep wavelengths of the plurality of lights output by the plurality of gain mediums and compensate for spectroscopic optical paths of the plurality of lights; a second light source part configured to connect the first light source part to the wavelength-swept filter unit in series and feed the wavelength-swept lights back to the plurality of gain mediums; a combiner configured to combine the wavelength-swept lights and output a combined wavelength-swept; and a controller configured to control an output magnitude and a wavelength region of the wavelength-swept lights.