基于级联微环辅助Mach-Zehnder干涉仪的带宽可调谐光滤波器的设计  

Optical Filter Design Based on Cascaded Double-Ring-Assisted MachZehnder Interferometers with Bandwidth Tuning Capability

作　　者：赖明彬 耿敏明[1,2,3,4] 谭伊璇 冯瑶 何万才 蒋佳 刘嫱 张振荣 Lai Mingbin;Geng Minming;Tan Yixuan;Feng Yao;He Wancai;Jiang Jia;Liu Qiang;Zhang Zhenrong(School of Computer,Electronics and Information,Guangxi University,Nanning 530004,Guangxi,China;Guangxi Key Laboratory of Multimedia Communications and Network Technology,Nanning 530004,Guangxi,China;Key Laboratory of Multimedia Communications and Information Processing of Guangxi Higher Education Institutes,Nanning 530004,Guangxi,China;Guangxi Experiment Center of Information Science,Guilin 541004,Guangxi,China)

机构地区：[1]广西大学计算机与电子信息学院,广西南宁530004 [2]广西多媒体通信与网络技术重点实验室,广西南宁530004 [3]广西高校多媒体通信与信息处理重点实验室,广西南宁530004 [4]广西信息科学实验中心,广西桂林541004

出　　处：《光学学报》2023年第11期119-128,共10页Acta Optica Sinica

基　　金：国家自然科学基金(61741504,61965003,61661004);广西自然科学基金(2018GXNSFAA294133)。

摘　　要：设计了一种基于绝缘体上硅的具有大带宽调谐范围的紧凑型可重构光学滤波器,该滤波器由两级双微环谐振器辅助对称马赫-曾德尔干涉仪结构级联构成,器件的尺寸为60μm×87μm。通过控制微环谐振器的相位,可以实现对滤波器输出带宽和中心波长的调谐。采用时域有限差分方法模拟该器件的性能,仿真结果表明,该滤波器的带宽调谐范围为1.5~5 nm,在调节带宽的过程中滤波器的阻带抑制度大于20 dB,通带损耗为0.73 dB~0.88 dB,同时该滤波器的中心波长调谐范围可以覆盖整个自由光谱范围,并保持3 dB带宽和形状因子基本不变。Objective As the revolution of newgeneration information technology continues to advance around the world,the data traffic of the Internet is growing exponentially,and the demand for network bandwidth in various fields is increasing.The optical communication system,the core of networks,should continuously improve the frequency spectrum efficiency and the transmission capacity to meet the demands of future development.Hence,it faces great challenges.Siliconbased photonic integration technology has been developing rapidly due to its advantages of high integration,low costs,large bandwidth,and compatibility with CMOS technology.It is widely applied in optical fiber communication,optical sensing,optical modulation,quantum communication,optical neural networks,and other fields.The tunable silicon photonic filter is one of the most important components and plays a vital role in the wavelength division multiplexing(WDM)system of optical fiber communication.Optical filters include the MachZenhnder interferometer(MZI),microring resonator(MRR),Bragggratings,arrayed waveguide grating(AWG),echelle diffraction grating(EDG),and MRRassisted MZI(MRRMZI).However,these filters have limitations in the size of devices,power consumption,flexibility,and adjustable range.Therefore,a tunable filter based on SOI material is proposed.The bandwidth and center wavelength of the filter can be tuned by the cascading of two filter units of the doubleringassisted MZI,which guarantees that the filter output has a good shape factor and a flat passband.Methods The tunable filter of the cascaded doubleringassisted MZI based on SOI material proposed in this paper is composed of two cascaded MRRMZI filters.The spectral response of the tunable filter is the intersection of the transmission spectrum response of two doubleringassisted MZI filters,and its bandwidth is determined by the overlapping region of the transmission spectrum response of the two units.Therefore,on the premise that the bandwidth and center wavelength of the filter can be adjusted,t

关 键 词：集成光学 光学滤波器 马赫-曾德尔干涉仪 带宽可调谐 微环谐振器 

分 类 号：TN256[电子电信—物理电子学]