  In this paper, an all-optical logic scheme which exploits the cross-phase
modulation (XPM) effect in semiconductor-optical-amplifier-assisted
Mach-Zehnder Interferometer (SOA-MZI), is proposed, performance analyzed and
parameters optimized. The proposal is validated and the system performance
under various parameters is examined through numerical simulations. With only
moderate parameters, high-speed all-optical AND gate based on SOA-MZI is
realized with fairly high performance. The results are helpful for designing of
SOA-based all-optical logic devices.
