Abstract: A scheme for all-optical clock recovery from non-return-to-zero(NRZ) coded data by combining a novel clock enhancement component with a two section distributed feed back(DFB) laser has been proposed, and its' function and performances under 64 Gb/s NRZ data streams have been demonstrated and investigated by numerical simulation. It is shown that this system can achieve clock recovery from high-speed NRZ data with a satisfying performance.