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All-optical NOR and XNOR logic gates at 2 Tb/s based on two-photon absorption in quantum-dot semiconductor optical amplifiers

机译：量子点半导体光放大器中基于双光子吸收的2 Tb / s的全光NOR和XNOR逻辑门

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摘要

Two-photon absorption (TPA) is a nonlinear absorption process in semiconductors, creating a fast phase change in a low-intensity probe beam. Placing quantum-dots (QDs), on the other hand, in the active region of semiconductor optical amplifiers (SOAs) results in SOAs shorter carrier recovery time and lower gain saturation. Thus, in this article, the physical advantages of both TPA and QDs have been combined to numerically investigate the performance of all-optical NOT-OR (NOR) and exclusive-NOR (XNOR) logic gates, incorporating in Mach-Zehnder interferometers at a data rate of 2 Tb/s. The output quality factor (QF) of the considered Boolean functions against the key operational parameters is assessed and examined, including the impact of amplified spontaneous emission in order to obtain more realistic results. The overall QF in the presence of TPA is always higher than that without TPA.
机译：双光子吸收（TPA）是半导体中的非线性吸收过程，在低强度探测光束中产生快速的相变。另一方面，将量子点（QD）放置在半导体光放大器（SOA）的有源区域中会导致SOA缩短载波恢复时间并降低增益饱和度。因此，在本文中，将TPA和QD的物理优势结合起来，以数字方式研究了全光NOT-OR（NOR）和Exclusive-NOR（XNOR）逻辑门的性能，并将其结合在Mach-Zehnder干涉仪中。数据速率为2 Tb / s。评估和检查了考虑的布尔函数相对于关键操作参数的输出质量因子（QF），包括放大的自发辐射的影响，以便获得更实际的结果。有TPA的情况下的总体QF总是高于没有TPA的情况。

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