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All‐optical logic performance of quantum‐dot semiconductor amplifier‐based devices

The performances of all‐optical logic gates AND, OR, XOR, and NOT, based on quantum‐dot semiconductor optical amplifier (QD‐SOA) devices, are simulated. The saturation power, optical gain, and optical phase response of a QD‐SOA is analyzed numerically using a rate‐equation model of quantum dots embedded in a wetting layer. The calculated response is used to model the performance of the logic gates. The impact of the injection current and the input‐signal power on the system's quality factor are studied. For the parameters used in this paper, all‐optical logic gates using QD‐SOA are capable of operating at speeds of ∼250 Gb/s. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 29–35, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21252