基于下山单纯形算法的宽带光子晶体1×3分束器研究  

Broadband Photonic Crystal 1×3 Beam Splitter Designed by Downhill⁃Simplex Algorithm

作　　者：许健[1] 施鹏程 施伟华[1] 李培丽[1] Xu Jian;Shi Pengcheng;Shi Weihua;Li Peili(College of Electronic and Optical Engineering&College of Flexible Electronics(Futrue Technology),Nanjing University of Posts and Telecommunications,Nanjing 210023,Jiangsu,China)

机构地区：[1]南京邮电大学电子与光学工程学院、柔性电子(未来科技)学院,江苏南京210023

出　　处：《中国激光》2024年第2期45-53,共9页Chinese Journal of Lasers

摘　　要：提出了一种基于二维光子晶体的波导型宽带光子晶体1×3分束器,通过在波导分支处引入一个调控介质柱并优化其半径和偏移量,可以调控分束器各输出端口的透过率;通过在两分支波导内侧引入三组带宽优化介质柱并优化其半径,可以实现分束器的宽带特性。为了提高优化效率,获得性能优良的宽带分光比可设计的分束器,利用下山单纯形算法,根据特定的分光比目标,对提出的1×3分束器进行逆向设计和研究。结果表明,不仅提高了光子晶体分束器的优化效率,而且获得了性能优良的宽带分束器。设计的1×3等比分束器在1525~1565 nm带宽范围内的附加损耗低于0.199 dB,均匀性小于0.119 dB,响应时间在0.5 ps以内;设计的1×3不等比分束器在1525~1565 nm带宽范围内的附加损耗不大于0.177 dB,分束方差不大于6.88×10^(-4),响应时间在0.5 ps以内。该分束器在未来全光通信网、光子高密度集成等领域具有很好的应用前景。Objective An optical beam splitter is an important device for optical communication.It is mainly used to split optical signals and realize optical signal splitting and combination in transmission networks.Compared with traditional beam splitters,photonic crystalbased beam splitters have low transmission loss,large-angle beam splitting,small size,and easy integration,making them suitable for large-scale and high-density integration in modern communication.In recent years,research on photonic crystal-based optical beam splitters has mainly focused on enhancing the beam-splitting capacity of single-wavelength optical beam splitters,which has limited their application.Broadband photonic crystal beam splitters have become a current focus of research.In addition,few structures can achieve broadband beam splitting and flexible beam-splitting ratios simultaneously.A photonic crystal beam splitter that can achieve a flexible and designable splitting ratio within a wide bandwidth range is of great significance for the optical communication system.In this article,a broadband 1×3 photonic crystal beam splitter is proposed based on a 2D photonic crystal waveguide.By introducing a regulating dielectric column at the waveguide branch and optimizing its radius and offset,we can adjust the transmittance of each output port of the beam splitter.By introducing three sets of bandwidth-optimized dielectric columns on the inner side of the two branch waveguides and optimizing their radii,the broadband characteristics of the beam splitter can be achieved.Methods Currently,optimization of the structural parameters of broadband photonic crystal beam splitters mainly uses the control variable method,which is time consuming,inefficient,and only suitable for optimizing a small number of variables.To improve the performance of broadband photonic crystal beam splitters,multiple parameters must be adjusted simultaneously.Therefore,it is difficult to realize a broadband photonic crystal beam splitter with a flexible beam-splitting ratio and ex

关 键 词：光学器件 光子晶体 分束器 宽带 下山单纯形算法 

分 类 号：TN256[电子电信—物理电子学]