Fang Yanfeng, Tang Xiaoping
Appl Opt. 2022 Mar 20;61(9):2306-2312. doi: 10.1364/AO.451212.
In this paper, we aim to design a compact structure that can work both as an optical adder and subtractor. Also, as far as we know, one of the main disadvantages of previous optical adders or subtractors is that, inside a single structure, the levels of optical intensity for logic 1 at different output ports are different. In this work, we aim to solve this issue, too. For this purpose, two separate structures were designed for the half-adder and half-subtractor. The final structure was realized by combining these structures and adding an extra control port. When the control port is 0, the structure can work as an optical half-adder; however, when the control port is 1, the proposed structure can work as an all optical half-subtractor. The simulation results show that the rise time and ON/OFF contrast ratio are about 1.5 ps and 18.3 dB, respectively. Also the simulation results prove that the output levels for logic at all the output ports are at similar levels.
在本文中，我们旨在设计一种紧凑的结构，使其既能作为光加法器又能作为光减法器。此外，据我们所知，先前光加法器或光减法器的主要缺点之一是，在单个结构内部，不同输出端口处逻辑1的光强度水平不同。在这项工作中，我们也旨在解决这个问题。为此，为半加器和半减法器设计了两个独立的结构。最终结构是通过将这些结构组合并添加一个额外的控制端口来实现的。当控制端口为0时，该结构可作为光半加器工作；然而，当控制端口为1时，所提出的结构可作为全光半减法器工作。仿真结果表明，上升时间和开/关对比度分别约为1.5 ps和18.3 dB。此外，仿真结果证明所有输出端口处逻辑的输出电平处于相似水平。
