The principle, how the Fabry-Pérot (F-P) cavity followed by amplitude equalizing system based on semiconductor optical amplifier (SOA) and cascade offset filter achieves all-optical clock recovery from the signal whose bit rate is a multiple of the free spectral range (FSR) of the F-P cavity, is explained. How the parameter of the filter in the amplitude equalizing system affects the amplitude fluctuation of the recovered clock is researched and the best parameter in theory is obtained. In the experiment, to solve the problem that is great fluctuation after F-P cavity because of the phase difference between the optical signals in different channels of the optical time division multiplexed (OTDM) system, a wavelength conversion system is utilized. Finally, by using the F-P cavity with 102 GHz FSR and amplitude equalizing system, 102 GHz optical clock recovery from 102 Gb/s return to zero code on-off Keying (RZ-OOK）signal and 204 GHz optical clock recovery from 204 Gb/s RZ-OOK signal are experimentally demonstrated. The 102 GHz recovered clock has an amplitude fluctuation of 8.5% and a timing jitter less than 236 fs, and the 204 GHz recovered clock has an amplitude fluctuation of 9.4% and a timing jitter less than 251 fs.