基于光子晶体和纳米线波导的马赫-曾德尔型调制器
投稿时间:2018-12-23  修订日期:2019-05-28  点此下载全文
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作者单位E-mail
胡宇宸 南京邮电大学 hundeduwu@126.com 
陈鹤鸣 南京邮电大学 chhm@njupt.edu.cn 
周昊天 南京邮电大学  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:提出了一种基于光子晶体和纳米线波导的马赫-曾德尔型调制器。该调制器由硅基光子晶体平板波导、纳米线波导和光子晶体多模干涉耦合器(MMI)构成。在光子晶体与纳米线波导连接处采用了锥型结构,用于减少模式失配造成的损耗。利用时域有限差分法(3D-FDTD)进行仿真分析,结果表明,该调制器在工作波长1550nm下的插入损耗为0.3dB,消光比为15.1dB,器件尺寸仅46μm×8μm×0.22μm,调制带宽可以达到68GHz,且工作区域覆盖了以1551nm为中心波长20nm的通信波段。该调制器结构紧凑,易于集成,可应用于高速光通信系统。
中文关键词:光子晶体,调制器,多模干涉耦合,马赫-曾德尔型
 
A novel M-Z modulator based on photonic crystal and nanowire waveguide
Abstract:A Mach-Zehnder modulator based on photonic crystal and nanowire waveguide is proposed. The modulator consists of silicon-based photonic crystal slab waveguides, nanowire waveguides, and two photonic crystal multimode interference couplers (MMI). Designed tapered structures are working at the junction of the photonic crystal and the nanowire waveguide to reduce the loss caused by the mode mismatch. The simulation analysis by time-domain finite difference method (3D-FDTD) shows that the insertion loss and extinction ratio of the modulator with a compact size of only 46μm × 8μm × 0.22μm at the operating wavelength of 1550 nm are 0.3dB,15.1dB,respectively. The operation with a wavelength range of 20 nm are obtained at a center wavelength of 1551 nm.The 3dB bandwidth can reach 68 GHz,which allows high speed optical communication systems.
keywords:Photonic crystal, modulator, multimode interference coupling, Mach-Zehnder type
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