All‐optical logic or gate using two cascaded semiconductor optical amplifiers

Abstract

AbstractA novel all‐optical logic OR gate based on cross‐gain modulation (XGM) using a two‐cascaded semiconductor optical amplifiers (SOAs) in a counterpropagating topology is presented. The attractive issue of the proposed method is that the logic OR gate can be obtained at a probe wavelength by taking advantage of the positive gain variation of one of the two used SOAs in the counterpropagating configuration. This reported feasibility study shows the all‐optical logic OR gate can be easily achieved with an extinction ratio higher than 7 dB.© 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1568–1570, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22560