A compact electro-optical programmable logic device (PLD) which can provide any of 16 possible minterms of four Boolean variables on an optical signal is demonstrated in this paper. The presented structure is based on electro-optical graphene–silicon switches that consist of a Mach–Zehnder interferometer in which a few-layer graphene is embedded in silicon slot waveguide to construct phase shifters. A large effective index variation can be achieved by embedding few-layer graphene inside the slot waveguide which enables us to have a compact footprint. Our analysis shows that the presented PLD has a small footprint of 1.86 × 1.28 mm². Any combinational logic circuit can be implemented by programming the proposed PLD. Here, the presented structure is programmed to work under three different modes including logical operations, two-bit adder, and two-bit comparator with the advantage of very fast switching among operation modes. Comparison with previous works shows that our design has a compact footprint, high extinction ratio, and low insertion loss with broadband spectrum for wideband telecommunication.

中文翻译：

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基于石墨烯-硅开关的紧凑型电光可编程逻辑器件

本文演示了一种紧凑的电光可编程逻辑器件（PLD），它可以在光信号上提供四个布尔变量的16个可能的最小项。提出的结构基于电光石墨烯-硅开关，该开关由马赫-曾德尔干涉仪组成，其中几层石墨烯嵌入硅缝隙波导中以构成移相器。通过在缝隙波导中嵌入几层石墨烯，可以实现较大的有效折射率变化，这使我们能够获得紧凑的占位面积。我们的分析表明，提出的PLD的占地面积仅为1.86×1.28 mm ²。任何组合逻辑电路都可以通过对建议的PLD进行编程来实现。这里，所提出的结构被编程为在三种不同的模式下工作，包括逻辑运算，两位加法器和两位比较器，其优点是可以在运算模式之间快速切换。与以前的作品进行比较表明，我们的设计具有紧凑的占用空间，高的消光比和较低的宽带电信宽带频谱插入损耗。