基于二维光子晶体的半加器设计与优化  

Design and Optimization of Half-Adder Based on Two-Dimensional Photonic Crystal

作　　者：张岩 李梦凡 陈德媛 Zhang Yan;Li Mengfan;Chen Deyuan(College of Electronic and Optical Engineering&College of Microelectronics,Nanjing University of Posts and Telecommunications,Nanjing,Jiangsu 210023,China)

机构地区：[1]南京邮电大学电子与光学工程学院、微电子学院,江苏南京210023

出　　处：《激光与光电子学进展》2022年第1期310-315,共6页Laser & Optoelectronics Progress

摘　　要：在完整的二维三角晶格硅中引入线缺陷和点缺陷,利用波导耦合和线性干涉,提出了一种基于光子晶体的全光半加器结构。半加器由波导分束器、全光逻辑与门和全光逻辑异或门组成。利用Rsoft软件,结合平面波展开法和时域有限差分法对所提半加器进行仿真研究。结果表明,所提半加器在波长为1530 nm时"进位"和"和位"端口的对比度分别为4.67 dB和10.77 dB,响应时间约为2.67 ps。为了提高"进位"端口的对比度,文中对半加器的结构进行了优化。优化后的半加器"进位"和"和位"端口的对比度分别为8.26 dB和15.34 dB,响应时间为3.67 ps,理论上可以达到0.273 Tbps的数据传输速率。所提出优化后的半加器具有较高的对比度,在全光信号处理系统和集成光路中具有重要作用。In this study,line defects and point defects are introduced in a complete two-dimensional triangular lattice silicon.Using waveguide coupling and linear interference,an all-optical half-adder structure based on photonic crystal is proposed.The half-adder consists of waveguide beam splitters,an all-optical logic AND gate and an all-optical logic XOR gate.Using Rsoft software,combined with the plane-wave-expansion method and the finite-difference time-domain method,the proposed half-adder is simulated.Results show that the contrast ratios of the“carry”and“sum”ports of the proposed half-adder are 4.67 dB and 10.77 dB when the input-light wavelength is 1530 nm,and the response time is about 2.67 ps.In order to improve the contrast ratio of the“carry”port,the structure of the half-adder is optimized.The contrast ratios of the“carry”and“sum”ports of the optimized half-adder are 8.26 dB and 15.34 dB,respectively,and the response time is 3.67 ps.Theoretically,it can reach a data transmission rate of 0.273 Tbps.The proposed half-adder with optimized structure has the characteristic of high contrast ratio,and plays an important role in all-optical signal processing systems and integrated optical circuits.

关 键 词：光学器件 光逻辑器件 半加器 光子晶体 

分 类 号：TN256[电子电信—物理电子学]