A new pha~e lock loop (PLL) IS proposed and demonstrated fat clock recovery from 40 Gblt/s time-dIvision-multiplexed (TDM) optical pulse tri.lin, The proposed clock lecovery scheme lmproves the Jitter effecl cOlmng from the clock. pulse laser of harmonically-mode locked flber laser The cross-corrdation frequency component between the optical Signa] and an optical clock pulse tram is deteCled as a fonr-wave-mixing (FWM) SIgnal generated in SOA. The lock-in freqnency range of the clod. recovery IS found to be within 10 KHz. 0 KHz.