面向稀疏波分复用系统的超大带宽硅基光子滤波器  

Ultra-High-Bandwidth Silicon-Based Photonic Filter for Coarse Wavelength Division Multiplexing Systems

作　　者：廖莎莎 黄琮 冯玉婷 张伍浩 赵帅 刘真伟 Liao Shasha;Huang Cong;Feng Yuting;Zhang Wuhao;Zhao Shuai;Liu Zhenwei(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]上海交通大学区域光纤通信网与新型光通信系统国家重点实验室,上海200240

出　　处：《光学学报》2023年第5期158-165,共8页Acta Optica Sinica

基　　金：重庆市自然科学基金面上项目(cstc2019jcyj-msxmX0597);上海交通大学区域光纤通信网与新型光通信系统国家重点实验室开放基金(2021GZKF005)。

摘　　要：大带宽光子滤波器被广泛应用于稀疏波分复用系统中,而在硅基芯片上实现结构紧凑、性能优良的超大带宽滤波器仍然是该领域研究的重点。提出一种基于光栅辅助反向耦合器的超大带宽硅基光子滤波器。利用窄波导更低有效折射率和更分散电场分布的性质,实现了带宽为92.9 nm、器件长度为250.6μm的超大带宽滤波器。该滤波器具有矩形度高、带宽大、损耗低等优势,能满足稀疏波分复用系统中解复用等需求。Objective With the continuous development of scientific and technological information,people's demand for communication system capacity and speed is increasing,and wavelength division multiplexing technology plays an important role in improving system capacity.As a key component of wavelength division multiplexing systems,the demultiplexer has become a research hotspot in this field.At present,a large-bandwidth filter with a high rectangular degree is mainly used to realize the function of demultiplexing.High-bandwidth and ultra-high-bandwidth filter schemes are frequently proposed and implemented,involving photonic crystals,Mach-Zehnder interferometers,and waveguide Bragg gratings.Although traditional schemes based on photonic crystals and waveguide Bragg gratings can achieve large bandwidths,additional magneto-optical devices such as optical circulators need to be added to separate the reflected signals due to their working in the reflection mode,which undoubtedly increases the complexity of the system.In addition,the difficulty in the large-scale integration of magneto-optical materials with silicon-based devices also affects the application range of the above schemes.The Mach-Zehnder interferometer scheme is also difficult to integrate on a large scale due to its large structure size.Therefore,to realize a compact ultra-high-bandwidth filter,this paper proposes a filtering scheme based on a grating-assisted contra-directional coupler structure.The filter has the advantages of a high rectangular degree,an ultra-high bandwidth,and a low loss and can meet the needs of demultiplexing in coarse wavelength division multiplexing systems.Methods To reduce the use of magneto-optical devices such as optical circulators and improve integration,this paper uses a grating-assisted contra-directional coupler structure to realize the filter function.According to the coupled mode theory,the bandwidth of the contra-directional coupler is inversely proportional to the sum of the effective refractive indices of the two waveguide

关 键 词：集成光学 稀疏波分复用 硅光子学 滤波器 光子集成电路 

分 类 号：TN256[电子电信—物理电子学]