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Improved optical coupling based on a concave cavity lens fabricated by optical fiber facet etching

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Chinese Optics Letters 2021年第5期19卷 12-18页

作者： Kanglin Li jiangbing du Weihong Shen Jiacheng Liu Zuyuan He State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China

We report a low-fabrication-complexity and wideband fiber lens,which is formed by fiber facet etching and filling high refractive index UV *** optical field can be significantly shrunk by the facet lens so as to obtain improved optical *** simulations were carried out for different coupling conditions,on both fundamental mode and highorder mode,for a nine-mode *** fundamental mode area can be reduced from 152.17 to 12.57μm^(~2),and the coupling loss between the fiber lens and a photonic waveguide can be reduced to-2.9 d B with over 1000 nm 3 d B bandwidth.

关键词： fiber lens optical coupling

High-speed silicon photonic Mach–Zehnder modulator at 2 μm

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Photonics Research 2021年第4期9卷 535-540页

作者： Xi Wang Weihong Shen Wenxiang Li Yingjie Liu Yong Yao jiangbing du Qinghai Song Ke Xu Department of Electronic&Information Engineering Harbin Institute of TechnologyShenzhen 518055China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China

Recently,2-μm wave band has gained increasing interest due to its potential application for next-generation optical *** the development of 2-μm optical communications is substantially hampered by the modulation speed due to the device bandwidth ***,a high-speed modulator is highly demanded at 2μ*** by this prospect,we demonstrate a high-speed silicon Mach–Zehnder modulator for a 2-μm wave *** device is configured as a single-ended push–pull structure with waveguide electrorefraction via the free carrier plasma *** modulator was fabricated via a multiproject wafer shuttle run at a commercial silicon photonic *** modulation efficiency of a single arm is measured to be 1.6 V·*** high-speed characterization is also performed,and the modulation speed can reach 80 Gbit/s with 4-level pulse amplitude modulation(PAM-4)formats.

关键词： modulator waveguide gained

Adaptive and Intelligent Digital Signal Processing for Improved Optical Interconnection

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ZTE Communications 2020年第2期18卷 57-73页

作者： SUN Lin du jiangbing HUA Feng TANG Ningfeng HE Zuyuan State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Mobile Network and Mobile Multimedia Technology ZTE CorporationShenzhenGuangdong 518055China

In recent years, explosively increasing data traffic has been boosting the con?tinuous demand of high speed optical interconnection inside or among data centers, high performance computers and even consumer electronics. To pursue the improved intercon?nection performance of capacity, energy efficiency and simplicity, effective approaches are demonstrated including particularly advanced digital signal processing (DSP) meth?ods. In this paper, we present a review about the enabling adaptive DSP methods for opti?cal interconnection applications, and a detailed summary of our recent and ongoing works in this field. In brief, our works focus on dealing with the specific issues for short-reach interconnection scenarios with adaptive operation, including signal-to-noise-ratio (SNR) limitation, level nonlinearity distortion, energy efficiency consideration and the de?cision precision.

关键词： optical interconnection digital signal processing advanced modulation formats

Chalcogenide glass photonic integration for improved 2μm optical interconnection

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Photonics Research 2020年第9期8卷 1484-1490页

作者： WEIHONG SHEN PINGYANG ZENG ZELIN YANG DI XIA jiangbing du BIN ZHANG KE XU ZUYUAN HE AND ZHAOHUI LI State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China Department of Electronic and Information Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China

In this work,on-chip chalcogenide glass photonic integrations with several fundamental photonic building blocks are designed and fabricated based on the As2 S3 platform for improved 2μm optical interconnection,achieving a broadened wavelength bandwidth and improved fabrication tolerance.A 600 nm thick As2 S3 strip waveguide has low propagation loss of 1.447 dB/cm at 2μ*** vertical coupling is realized by a grating coupler with 4.3 dB coupling loss.A Bragg grating filter,power splitter,Mach–Zander interferometer,and mode converter for on-chip mode division multiplexing(MDM)are also reported at 2μm with reliable ***,a record high MDM optical interconnection capacity of 3×80 Gbps at 2μm is experimentally demonstrated based on the proposed As2 S3 chip,drawing promising prospects for future photonic integration and high-speed interconnection at the 2μm waveband.

关键词： 2μm interconnection optical

Mode division multiplexing:from photonic integration to optical fiber transmission[Invited]

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Chinese Optics Letters 2021年第9期19卷 29-52页

作者： jiangbing du Weihong Shen jiacheng Liu Yufeng Chen Xinyi Chen Zuyuan He State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China

To overcome the capacity crunch of optical communications based on the traditional single-mode fiber(SMF), different modes in a few-mode fiber(FMF) can be employed for mode division multiplexing(MDM). MDM can also be extended to photonic integration for obtaining improved density and efficiency, as well as interconnection capacity. Therefore, MDM becomes the most promising method for maintaining the trend of "Moore’s law" in photonic integration and optical fiber transmission. In this tutorial, we provide a review of MDM works and cutting-edge progresses from photonic integration to optical fiber transmission, including our recent works of MDM low-noise amplification, FMF fiber design, MDM Si photonic devices, and so on. Research and application challenges of MDM for optical communications regarding long-haul transmission and short reach interconnection are discussed as well. The content is expected to be of important value for both academic researchers and industrial engineers during the development of next-generation optical communication systems,from photonic chips to fiber links.

关键词： mode division multiplexing photonic integration few-mode fiber optical transmission optical interconnection

面向光印刷电路板的聚合物光波导制备及性能研究

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光学学报 2016年第6期36卷 167-172页

作者：徐晓马麟张文甲杜江兵何祖源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

选用紫外固化型环氧树脂,采用光刻技术在FR-4基板上制备了平行排布的多模聚合物光波导。波导具有阶跃折射率分布,相邻波导间隔为250μm,可与并带后的50μm芯径多模光纤实现多通道低损耗耦合。通过搭建测试平台,对波导的插入损耗、串扰... 详细信息

选用紫外固化型环氧树脂,采用光刻技术在FR-4基板上制备了平行排布的多模聚合物光波导。波导具有阶跃折射率分布,相邻波导间隔为250μm,可与并带后的50μm芯径多模光纤实现多通道低损耗耦合。通过搭建测试平台,对波导的插入损耗、串扰及错位容限进行了测量与分析。实验结果表明,所制备光波导的损耗小于0.05dB/cm,串扰小于-60dB。波导在错位容限方面性能良好,当输入端错位±5μm时,系统增加的插入损耗小于0.2dB。同时根据实际波导建立仿真模型,采用光束传播法分析了不同入射条件下的模式能量分布、差分模式延时及耦合效率。计算结果表明,使用与波导具有相近纤芯尺寸的入射光纤不仅可以减小耦合损耗和串扰,还能减少激发起的高阶模式数,提高波导的距离带宽积,优化光波导的综合传输性能。所制备的聚合物光波导作为组成光印刷电路板的核心光器件具有良好的应用前景。

关键词：集成光学聚合物光波导光刻技术传输损耗错位容限串扰

基于质子交换和刻蚀工艺的体铌酸锂阵列波导光栅

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光学学报 2023年第13期43卷 20-26页

作者：袁佳茜刘嘉程杜江兵何祖源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

提出一种将质子交换技术和刻蚀技术结合的体铌酸锂波导和器件加工方案,基于质子交换的铌酸锂晶体相变特性改变,降低了质子交换区直接刻蚀难度,结合质子交换的纵向折射率改变和刻蚀波导的横向结构改变,波导尺寸显著降低,采用粒子群算法... 详细信息

提出一种将质子交换技术和刻蚀技术结合的体铌酸锂波导和器件加工方案,基于质子交换的铌酸锂晶体相变特性改变,降低了质子交换区直接刻蚀难度,结合质子交换的纵向折射率改变和刻蚀波导的横向结构改变,波导尺寸显著降低,采用粒子群算法优化波导尺寸,最小可达2.5μm。基于该工艺方案设计了中心波长为1550 nm、四通道且通道间隔为400 GHz的阵列波导光栅,该阵列波导光栅的传输损耗约为6 dB,相邻通道间串扰均低于22 dB,整体尺寸仅为850μm×620μm,在高密度铌酸锂光子集成互连等场景具有较大的应用潜力。

关键词：光栅铌酸锂质子交换粗波分复用阵列波导光栅

High-speed silicon microring modulator at the 2μm waveband with analysis and observation of optical bistability

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Photonics Research 2022年第3期10卷 I0001-I0008页

作者： Weihong Shen Gangqiang Zhou jiangbing du Linjie Zhou Ke Xu Zuyuan He Peng Cheng Laboratory Shenzhen 518055China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China Department of Electronic and Information Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

Recently,significantly raised interests have emerged for the 2μm waveband as an extended new window for fiber optic *** research progress has been made on the photonic integrated circuits for the 2μm waveband,especially on the CMOS-compatible silicon-on-insulator *** this work,a silicon integrated microring modulator(MRM)with record high-speed performances at the 2μm waveband was *** L-shaped PN junction was specially designed for 2μm to achieve a high modulation efficiency with V_(π)L of 0.85V·*** measured 3 dB bandwidth is 18 GHz,supporting up to 50 Gbps signaling at 2μ***,optical bistability induced by the thermo-optical effect and nonlinear effects was analyzed theoretically and observed experimentally in the 2μm MRM for the first time to our *** coupled mode theory and the Runge-Kutta method were used to simulate the behaviors of bistability in the 2μm *** simulation and experimental results indicate that,when the MRM is launched by a high optical power,the distorted resonant spectrum under an optical bistable state deteriorates the modulation efficiency and signal *** work breaks the record of high-speed silicon MRM at 2μm,drawing a promising prospect for the silicon photonic integration and high-speed interconnection at the 2μm waveband,and it provides the referenceable analysis of optical bistability,which guides the design and experimental investigation of 2μm MRM.

关键词： wave resonant distorted

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基于移频环路扩频的新型宽带扫频光源

中国激光 2016年第5期43卷 130-135页

作者：李露杜江兵徐长鑫孙林李佳熊何祖源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 万马科技股份有限公司浙江临安311306

扫频光源(FSOS)在光通信、光传感和光成像等领域得到广泛应用,其扫频宽度和扫频速度直接影响了这些应用的性能。提出了一种明显改善扫频激光光源扫频范围和扫频速度的新方法,在移频环路中引入单边带调制,增强扫频电光调制,产生高阶稳定... 详细信息

扫频光源(FSOS)在光通信、光传感和光成像等领域得到广泛应用,其扫频宽度和扫频速度直接影响了这些应用的性能。提出了一种明显改善扫频激光光源扫频范围和扫频速度的新方法,在移频环路中引入单边带调制,增强扫频电光调制,产生高阶稳定的光梳,从而在保证相同线性度和窄线宽条件下,利用窄带的扫频电信号获得宽的光扫频范围。利用200 MHz的射频扫频宽度得到约11.44GHz的光扫频宽度,扩频约57倍,由于每次扫频时间相同,扫频速度也提高约57倍。

关键词：光纤光学扫频范围单边带调制移频环路光梳