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- All-optical XOR based on integrated MZI-SOA with Co and counter-propagation schemePublication . Reis, Cláudia; Dionísio, Rogério Pais; Neto, Berta; Teixeira, António; André, P.S.In this work we present a review of all-optical XOR gates based on Mach-Zehnder Interferometer with Semiconductor Optical Amplifiers (MZI-SOA), using NRZ modulated signals driven at 10 Gbit/s. The performance of two alternative schemes for logical XOR gates implementation is demonstrated through numerical simulations and experimentally. The extinction ratio shows high operation performance with low degradation.