document: All-optical logic NOR gate using two-cascaded semiconductor optical amplifiers The authors present a novel all-optical logic NOR gate using two-cascaded semiconductor optical . amplifiers -LRB- SOAs -RRB- in a counterpropagating feedback configuration . This configuration accentuates the gain nonlinearity due to the mutual gain modulation of the two SOAs . The all-optical NOR gate feasibility has been demonstrated delivering an extinction ratio higher than 12 dB over a wide range of wavelength
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