Fourier domain mode locking (FDML) technology can improve the scanning speed to achieve the designed limit of a tunable filter while the swept laser source maintains superior performance of the various parameters. To further improve the sweep frequency of the FDML swept laser source, an optical buffer device is introduced into the optical cavity of the laser to back up the swept light. In our experiment, the center wavelength of the swept laser source based on the optical buffer device within the ring cavity is 1310 nm, the sweep frequency range is 95 nm, the instantaneous line width is 0.1 nm, the scanning speed is raised to 202 kHz, and the average output optical power is 7.5 mW. In this paper, the optical buffer device is used to markedly increase the scanning speed of the traditional FDML high-speed swept laser source. It is important to improve the comprehensive imaging performance of swept source optical coherence tomography (SS-OCT) systems.