Novel self-synchronization scheme for high-speed packet TDM networks

We demonstrate a novel self-synchronization scheme for high-speed packet time-division-multiplexed (TDM) networks using a fast saturated, but slowly recovered gain (or loss) combined with intensity discrimination. The marker pulse used in this self-synchronization scheme is the same as other pulses in the packets. In particular, we use a semiconductor optical amplifier (SOA) as the fast saturated but slowly-recovered gain element, and an unbalanced nonlinear optical loop mirror or a dispersion-shifted fiber/optical filter combination as an intensity discriminator. The contrast ratio of the first pulse to the remaining pulses of a 100 Gb/s packet, "10111000" is >3 dB at the output of the SOA and >20 dB at the outputs of both intensity discriminators.