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We report on experimental jitter results of a 10-GHz mode-locked laser. The laser is an actively harmonically mode-locked fiber laser using an erbium-doped glass waveguide as the gain medium. Amplitude noise and corresponding phase noise effects are greatly reduced by the inclusion of an intracavity high-finesse fiber Fabry-Pe´rot etalon. Typical results show timing jitter of 21-fs root mean square, integrated from 10 Hz to 100 MHz.