硅基电光调制与模分复用集成器件  

Silicon-Based Integrated Device for Electro-Optic Modulation Assembly with Mode-Division Multiplexing

作　　者：项彤[1] 陈鹤鸣 胡宇宸 Xiang Tong;Chen Heming;Hu Yuchen(College of Electronic and Optical Engineering,Nanjing University of Posts and Telecommunications,Nanjing,Jiangsu 210023,China;Bell Honors School,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,江苏南京210023 [2]南京邮电大学贝尔英才学院,江苏南京210023

出　　处：《中国激光》2021年第11期131-142,共12页Chinese Journal of Lasers

基　　金：国家自然科学基金(61571237);江苏省自然科学基金(BK20151509)。

摘　　要：提出了一种硅基电光调制与模分复用的集成器件,该集成器件的电光调制模块由硅基光子晶体波导和宽度调制(WM)型谐振腔组成,模分复用模块由硅基非对称平行纳米线波导组成。光子晶体波导和纳米线波导的连接处采用锥形结构,用于减少两种波导之间的级联损耗。根据时域耦合模理论与等离子体色散效应,采用WM型谐振腔和PN掺杂结构实现了对TE0模式的调制。根据横向耦合模理论,采用非对称平行纳米线波导实现了TE0模向TE1模的转换。应用二维时域有限差分法(2D-FDTD)对其性能进行仿真分析,结果表明,该集成器件在调制电压为1.24V时,可以实现中心波长为1553.91nm的TE0模和TE1模的窄带通断调制及复用功能,插入损耗小于0.46 dB,消光比为19.73 dB,调制深度为0.9894,高品质因数Q值达1.5×10^(4),信道串扰小于-14.66 dB.该集成器件的结构紧凑,尺寸约为54μm×22μm,这对提高系统集成度、提升光通信网络容量具有重要意义。Objective As the package size of high-speed optical communication devices becomes smaller,and the performance requirements get higher,it is not easy for traditional electro-optic modules with separated components to meet the demands of modern communication.Currently,electro-optic devices are developing toward highly integrated miniaturization.There have been many studies on photonic-crystal-based electro-optic modulators and silicon-based mode division multiplexers.However,there are few studies on the integration of the two devices.During the evolution of optical communications in the future,the demands for small size,large-capacity,and high integra tion have become increasingly prominent.Thus,we propose a silicon based integrated device for electro-optic modulation assembly with mode division multiplexing,which has low insertion loss,low channel crosstalk,high extinction ratio,and large modula tion depth.The integrated device has a compact structure and excellent performance.It has broad application prospects in the field of high-speed and large-capacity optical communication and optoelectronic integration.Methods The proposed integrated device consists of electro-optic modulation and mode division multiplexing modules.The electro-optic modulation module consists of silicon-based photonic crystal waveguides and a width-modulated(WM)resonant cavity.The mode division multiplexing module consists of silicon-based asymmetric parallel nanowire waveguides.A tapered structure is used at the junction of photonic crystal and nanowire waveguides to reduce the cascade loss between the two waveguides.We used the finite-different time-domain(FDTD)and device methods in the commercial optical simulation software Lumerical for simulation analysis.According to the time-domain coupled-mode theory and plasma dispersion effect,WM-type resonant cavity and PN doping structure are used to achieve the on-off modulation of TE0 mode.According to the transverse coupled-mode theory,asymmetric parallel nanowire waveguides are used to achiev

关 键 词：光通信 硅基光子晶体 耦合模理论 电光调制 模分复用 集成器件 

分 类 号：TN256[电子电信—物理电子学]