基于石墨烯-硅混合集成光波导的电光半加器  

Design of a electro-optical half-adder based on silicon-graphene waveguides

作　　者：张杰[1] 李仕琪 丁健 汪鹏君[1,2] 陈伟伟 ZHANG Jie;LI Shi-qi;DING Jian;WANG Peng-jun;CHEN Wei-wei(Faculty of Information Science and Engineering,Ningbo University,Uingbo 315211,Chinas;College of Mathe matical,Physics and Electronic Information Engineering,Wenzhou University,Wenzhou 325035,China)

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211 [2]温州大学数理与电子信息工程学院,浙江温州325035

出　　处：《光电子．激光》2018年第8期805-810,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61675108;61474068;61307071);教育部高等学校博士学科点专项科研基金(20133305120004);集成光电子学国家重点联合实验室开放课题(IOSKL2015KF03)资助项目

摘　　要：设计了一种由基于马赫-曾德尔干涉结构的石墨烯-硅混合集成光开关级联而成的电光半加器。通过施加电压调节石墨烯化学势,改变石墨烯在平面方向上的介电常数,引起模式有效折射率发生变化,控制光波在基于马赫-曾德尔干涉结构的石墨烯-硅混合集成光开关不同端口输出,实现半加器逻辑功能。仿真结果表明:当石墨烯化学势在0.50eV与0.64eV两种状态切换下,在1 520nm到1 600nm波长范围内,基于马赫-曾德尔干涉结构的石墨烯-硅混合集成光开关的最差串扰为-21.57dB,插入损耗小于0.109dB。当数据传输速率为10Gbit/s时,基于石墨烯-硅混合集成光波导的电光半加器在1 550nm工作波长下,器件的消光比大于41.05dB。In this paper, a silicon-graphene electro-optical half-adder is presented, which is composed of three cascaded Mach-Zehnder interferometer（MZI）-based optical switches. For each phase shifter, a sili- con slot waveguide embedded with graphene flakes is adopted. The modal effective index of the silicon slot waveguide embedded with graphene flakes varies according to the carrier density in graphene. To a- chieve switching function,an electrical signal is applied to tune the Fermi levels of graphene flakes lead- ing to the variation of modal effective index. Simulation results show that the worst crosstalk of the Mach-Zehnder-based optical switch is -21.57 dB and the insertion loss is lower than 0.109 dB within a bandwidth from 1520 nm to 1600 nm when the chemical potential of graphene swiches between 0.50 eV and 0. 64 eV. The designed silicon-graphene electro-optical half-adder with the operation speed of 10 Gbit/s has an extinction ratio larger than 41.05 dB at an operating wavelength of 1550nm.

关 键 词：硅基光子学 电光半加器 马赫一曾德尔干涉型光开关 石墨烯 波导 

分 类 号：TN256[电子电信—物理电子学]