In this paper, photonic crystal structures are proposed to design configurable all-optical logic gates. These structures offer XOR/AND and XNOR/NAND logic operations which provide two logic functions in an output port by means of a control signal that provides more flexibility in circuit design procedure. Also, the proposed structures offer a half adder (AND/XOR) and its inverted logic (NAND/ XNOR). The proposed structures include a nonlinear directional coupler and Y-junctions. In the proposed structures, the nonlinear directional coupler, which consists of nonlinear rods made of silicon nano-crystals, is used to provide a phase shifter for different input powers. Finite difference time domain and plane wave expansion methods are used to evaluate the proposed structures. Effects of variations in wavelength, refractive index and radius of rods on the performance of the proposed structures are studied which indicate the robustness of the proposed structures against process variation. Simulation results show that the switching power and bit rateof the proposed structures are 3 W and 1 Tbits/s respectively.

中文翻译：

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可配置的全光光子晶体 XOR/AND 和 XNOR/NAND 逻辑门

在本文中，提出了光子晶体结构来设计可配置的全光逻辑门。这些结构提供 XOR/AND 和 XNOR/NAND 逻辑运算，它们通过控制信号在输出端口中提供两种逻辑功能，从而在电路设计过程中提供更大的灵活性。此外，所提出的结构提供了一个半加器 (AND/XOR) 及其反相逻辑 (NAND/XNOR)。建议的结构包括非线性定向耦合器和 Y 结。在所提出的结构中，非线性定向耦合器由硅纳米晶体制成的非线性棒组成，用于为不同的输入功率提供移相器。有限差分时域和平面波扩展方法用于评估所提出的结构。波长变化的影响，研究了杆的折射率和半径对所提出结构的性能的影响，这表明所提出的结构对过程变化的鲁棒性。仿真结果表明，所提出结构的开关功率和比特率分别为3 W和1 Tbits/s。