基于二维光子晶体波导的1×5等比分束器  

1×5 equal-score beam splitter based on two-dimensional photonic crystal waveguide

作　　者：厉梦瑶 徐光跃 郑加金[1] 李培丽[1] LI Mengyao;XU Guangyue;ZHENG Jiajin;LI Peili(College of Electronic and Optical Engineering&College of Microelectronics,Nanjing University of Posts 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：《光电子．激光》2021年第8期799-805,共7页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61275067)资助项目。

摘　　要：在完整的二维正方晶格硅光子晶体中引入点缺陷和线缺陷,利用点缺陷和线缺陷的耦合效应,提出一种基于二维光子晶体的1×5等比分束器。利用平面波展开法和时域有限差分法,对提出的1×5等比分束器进行了研究。研究结果表明,通过合理设置耦合区域的介质柱半径,可使1.55μm入射光实现等比传输到5个输出端口;为提高总透过率,在1×5等比分束器的弯曲波导处增加散射介质柱,并对相关参数进行优化,最终实现99.65%的透过率,附加损耗0.015 dB。该分束器体积较小,结构简单,附加损耗低,在未来的集成光路中具有很好的应用前景。In this study, point defects and line defects are introduced in a completely two-dimensional square lattice silicon, using the feature of coupling with point defects and line defects, a 1×5 equal-score beam splitter based on the two-dimensional photonic crystal is proposed.The performance of beam splitter is studied by plane-wave-expansion method and finite-difference time-domain method.The research results show that 1.55 μm incident light is transmitted to five port equally can be realized by changing the radius of dielectric column in the coupling region;in order to improve the total transmittance, scattering medium columns were added in the curved waveguide of the 1×5 equal-score beam, and the relevant parameters were optimized.At the same time, the transmittance reaches 99.65% and the insertion loss is 0.015 dB.The beam splitter is characterized by a smaller size, simple structure, low additional loss, which has important application prospect in future integrated optical circuit.

关 键 词：分束器 光子晶体 点缺陷 线缺陷 

分 类 号：TN256[电子电信—物理电子学]