A synchronization scheme for extraction of low-jitter rf signals from optical pulse trains, which is robust against photodetector nonlinearities, is described. The scheme is based on a transfer of timing information into an intensity imbalance of the two output beams from a Sagnac loop. Sub-100-fs timing jitter between the extracted 2-GHz rf signal and the 100-MHz optical pulse train from a mode-locked Ti:sapphire laser is demonstrated.
© 2004 Optical Society of America
J. Kim, F. X. Kärtner, and M. H. Perrott, "Femtosecond synchronization of radio frequency signals with optical pulse trains," Opt. Lett. 29, 2076-2078 (2004)