An all-optical clock recovery scheme based on a high fitness Fabry-Perot(F-P) filter is proposed and experimentally demonstrated.In order to make the scheme insensitive to the signal wavelength,wavelength conversion based on the cross phase modulation(XPM) in the fiber is done,so that the wavelength of the converted signal is always set exactly to the peak wavelength of the F-P filter.An F-P filter with the finesse up to 1012 is used to extract the clock,and the low frequency noise is consequently suppresse...