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Versatile photonic molecule switch in multimode microresonators

Light(Science & Applications) 2024年第3期13卷 498-509页

作者： zihan tao Bitao Shen Wencan Li Luwen Xing Haoyu Wang Yichen Wu Yuansheng tao Yan Zhou Yandong He Chao Peng Haowen Shu Xingjun Wang State Key Laboratory of Advanced Optical Communications System and Networks School of ElectronicsPeking UniversityBeijing 100871China College of Engineering Peking UniversityBeijing 100871China School of Integrated Circuits Peking University100871 BejingChina Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Frontiers Science Center for Nano-optoelectronics Peking UniversityBeijing 100871China Peng Cheng Laboratory Shenzhen 518055China

Harnessing optical supermode interaction to construct artificial photonic molecules has uncovered a series of fundamental optical phenomena analogous to atomic ***,the distinct energy levels and interactions in such two-level systems were provided by coupled *** reconfigurability is limited,as they often require delicate external field stimuli or mechanically altering the geometric *** highly specific approaches also limit potential ***,we propose a versatile on-chip photonic molecule in a multimode microring,utilizing a flexible regulation methodology to dynamically control the existence and interaction strength of spatial *** transition between single/multi-mode states enables the“switched-off/on”functionality of the photonic molecule,supporting wider generalized applications *** particular,“switched-on”state shows flexible and multidimensional mode splitting control in aspects of both coupling strength and phase difference,equivalent to the *** *** effect.“Switched-off”state allows for perfect low-loss single-mode transition(Qi~10 million)under an ultra-compact bend size(FSR~115 GHz)in a foundry-based silicon *** breaks the stereotyped image of the FSR-Q factor trade-off,enabling ultra-wideband and high-resolution millimeter-wave photonic *** demonstration provides a flexible and portable solution for the integrated photonic molecule system,extending its research scope from fundamental physics to real-world applications such as nonlinear optical signal processing and sixth-generation wireless communication.

关键词： switched multimode millimeter

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Reliable intracavity reflection for self-injection locking lasers and microcomb generation

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Photonics Research 2024年第5期12卷 I0001-I0010页

作者： BItao SHEN XUGUANG ZHANG YIMENG WANG zihan tao HAOWEN SHU HUAJIN CHANG WENCAN LI YAN ZHOU Zhangfeng Ge RUIXUAN CHEN BOWEN BAI LIN CHANG XINGJUN WANG State Key Laboratory of Advanced Optical Communications System and Networks School of ElectronicsPeking UniversityBeijing 100871China Peng Cheng Laboratory Shenzhen 518055China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Frontiers Science Center for Nano-optoelectronics Peking UniversityBeijing 100871China

Self-injection locking has emerged as a crucial technique for coherent optical sources,spanning from narrow linewidth lasers to the generation of localized *** technique involves key components,namely a laser diode and a high-quality cavity that induces narrow-band reflection back into the laser ***,in prior studies,the reflection mainly relied on the random intracavity Rayleigh backscattering,rendering it unpredictable and unsuitable for large-scale production and wide-band *** this work,we present a simple approach to achieve reliable intracavity reflection for self-injection locking to address this challenge by introducing a Sagnac loop into the *** method guarantees robust reflection for every resonance within a wide operational band without compromising the quality factor or adding complexity to the fabrication *** a proof of concept,we showcase the robust generation of narrow linewidth lasers and localized microcombs locked to different resonances within a normal-dispersion ***,the existence and generation of localized patterns in a normal-dispersion cavity with broadband forward–backward field coupling is first proved,as far as we know,both in simulation and in *** research offers a transformative approach to self-injection locking and holds great potential for large-scale production.

关键词： intracavity injection locking

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电力终端安装选址及网络运营商选择的研究

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电力系统装备 2024年第4期 139-141页

作者：董军钟宝坤陶梓涵广东电网公司广州供电局广东广州510000

文章基于一款自研的无线公网信号测试仪,通过全面测试各种制式的公网信号强度和通信效果,为电力终端选择最佳地理位置和网络运营商提供参考,同时提高通信可靠性,降低运维工作量,实现电力系统的高效运行。

关键词：智能电网智能寻址信号检测

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Highly reconfigurable silicon integrated microwave photonic filter towards next-generation wireless communication

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Photonics Research 2023年第5期11卷 682-694页

作者： zihan tao YUANSHENG tao MING JIN JUN QIN RUIXUAN CHEN BItao SHEN YICHEN WU HAOWEN SHU SHAOHUA YU XINGJUN WANG State Key Laboratory of Advanced Optical Communications System and Networks School of ElectronicsPeking UniversityBeijing 100871China Key Laboratory of Information and Communication Systems Ministry of Information IndustryBeijing Information Science and Technology UniversityBeijing 100192China Peng Cheng Laboratory Shenzhen 518055China Frontiers Science Center for Nano-optoelectronics Peking UniversityBeijing 100871China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China

Integrated microwave photonic filters(IMPFs)are capable of offering unparalleled performances in terms of superb spectral fineness,broadband,and more importantly,the reconfigurability,which encounter the trend of the next-generation wireless ***,to achieve high reconfigurability,previous works should adopt complicated system structures and modulation formats,which put great pressure on power consumption and controlment,and,therefore,impede the massive deployment of ***,we propose a streamlined architecture for a wideband and highly reconfigurable IMPF on the silicon photonics *** various practical filter responses,to avoid complex auxiliary devices and bias drift problems,a phase-modulated flexible sideband cancellation method is employed based on the intensity-consistent single-stage-adjustable cascadedmicroring(ICSSA-CM).The IMPF exhibits an operation band extending to millimeter-wave(≥30 GHz),and other extraordinary performances including high spectral resolution of 220 MHz and large rejection ratio of 60 d B are ***,Gb/s-level RF wireless communications are demonstrated for the first time towards real-world *** proposed IMPF provides broadband flexible spectrum control capabilities,showing great potential in the next-generation wireless communication.

关键词： reconfigurable filter millimeter

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贸易环境不确定性对新能源企业成本的影响

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财政科学 2024年第3期 69-79页

作者：陈少强覃凤琴戴琳赵若琪陶子晗中国财政科学研究院

受贸易保护主义及地缘政治等因素影响,全球产业链供应链格局持续动荡,本文从外部环境不确定性对新能源企业成本的影响入手,研究发现以下问题:各类贸易壁垒显著增加企业制度交易成本、规则话语权缺失成为产业链供应链重塑的痛点、新能源... 详细信息

受贸易保护主义及地缘政治等因素影响,全球产业链供应链格局持续动荡,本文从外部环境不确定性对新能源企业成本的影响入手,研究发现以下问题:各类贸易壁垒显著增加企业制度交易成本、规则话语权缺失成为产业链供应链重塑的痛点、新能源产业发展的相关体制机制不健全、新能源产业发展政策红利存在减损,并基于此提出看法和建议:应系统应对新能源产业发展贸易壁垒、重视新能源产业规则和制度开放、完善新能源产业发展的体制机制、稳定新能源企业发展的政策预期。

关键词：供应链产业链重构贸易环境不确定性新能源企业成本

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An ultra-compact polarization-insensitive slot-strip mode converter

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Frontiers of Optoelectronics 2022年第1期15卷 53-59页

作者： zihan tao Bo Wang Bowen Bai Ruixuan Chen Haowen Shu Xuguang Zhang Xingjun Wang State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China Frontier Science Center for Nano-Optoelectronics Peking UniversityBeijing 100871China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Peng Cheng Laboratory Shenzhen 518055China

Integrated waveguides with slot structures have attracted increasing attention due to their advantages of tight mode confinement and strong light-matter *** extensively studied,the issue of mode mismatch with other strip waveguide-based optical devices is a huge challenge that prevents integrated waveguides from being widely utilized in large-scale photonic-based *** this paper,we demonstrate an ultra-compact low-loss slot-strip converter with polarization insensitivity based on the multimode interference(MMI)*** sinusoidal profiles are adopted to allow for smooth connection between the slot and strip waveguide,resulting reflection *** manipulating the MMI effect with structure optimization,the self-imaging positions of the TE0 and TM0 modes are aligned with minimized footprint,leading to low-loss transmission for both *** measurement results show that high coupling efficiencies of−0.40 and−0.64 dB are achieved for TE_(0) and TM_(0) polarizations,*** device has dimensions as small as 1.1μm×1.2μm and composed of factory-available *** above characteristics of our proposed compact slot-strip converter makes it a promising device for future deployment in multi-functional integrated photonics systems.

关键词： Silicon photonics Slot-strip convertor Multimode interference(MMI) Polarization-insensitive

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Submilliwatt, widely tunable coherent microcomb generation with feedback-free operation

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Advanced Photonics 2023年第3期5卷 144-154页

作者： Haowen Shu Lin Chang Chenghao Lao Bitao Shen Weiqiang Xie Xuguang Zhang Ming Jin Yuansheng tao Ruixuan Chen zihan tao Huajin Chang Shaohua Yu Qifan Yang Xingjun Wang John E.Bowers Peking University School of ElectronicsState Key Laboratory of Advanced Optical Communication Systems and NetworksBeijingChina University of California Santa BarbaraDepartment of Electrical and Computer EngineeringSanta BarbaraCaliforniaUnited States Peking University School of PhysicsState Key Laboratory for Artificial Microstructure and Mesoscopic PhysicsBeijingChina Peng Cheng Laboratory ShenzhenChina Peking University Frontiers Science Center for Nano-OptoelectronicsBeijingChina

Microcombs are revolutionizing optoelectronics by providing parallel, mutually coherent wavelengthchannels for time-frequency metrology and information processing. To implement this essential function inintegrated photonic systems, it is desirable to drive microcombs directly with an on-chip laser in a simpleand flexible way. However, two major difficulties have prevented this goal: (1) generating mode-lockedcomb states usually requires a significant amount of pump power and (2) the requirement to align laser andresonator frequency significantly complicates operation and limits the tunability of the comb lines. Here, weaddress these problems by using microresonators on an AlGaAs on-insulator platform to generate dark-pulsemicrocombs. This highly nonlinear platform dramatically relaxes fabrication requirements and leads to arecord-low pump power of <1 mW for coherent comb generation. Dark-pulse microcombs facilitated bythermally controlled avoided mode crossings are accessed by direct distributed feedback laser *** any feedback or control circuitries, the comb shows good coherence and stability. With around150 mW on-chip power, this approach also leads to an unprecedentedly wide tuning range of over one freespectral range (97.5 GHz). Our work provides a route to realize power-efficient, simple, and reconfigurablemicrocombs that can be seamlessly integrated with a wide range of photonic systems.

关键词： dark-pulse microcomb direct pumping scheme widely tunable source

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Exploiting viral vectors to deliver genome editing reagents in plants

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aBIOTECH 2024年第2期5卷 247-261页

作者： Yilin Shen tao Ye zihan Li Torotwa Herman Kimutai Hao Song Xiaoou Dong Jianmin Wan State Key Laboratory of Crop Genetics and Germplasm Enhancement and Utilization Jiangsu Collaborative Innovation Centre for Modern Crop ProductionJiangsu Engineering Research Center for Plant Genome EditingNanjing Agricultural UniversityNanjing 210095China Zhongshan Biological Breeding Laboratory Nanjing 210014China Hainan Seed Industry Laboratory Sanya 572025China State Key Laboratory of Crop Gene Resources and Breeding Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China

Genome editing holds great promise for the molecular breeding of plants,yet its application is hindered by the shortage of simple and effective means of delivering genome editing reagents into *** plant transformation-based methods for delivery of genome editing reagents into plants often involve prolonged tissue culture,a labor-intensive and technically challenging process for many elite crop *** this review,we describe various virus-based methods that have been employed to deliver genome editing reagents,including components of the CRISPR/Cas machinery and donor DNA for precision editing in *** update the progress in these methods with recent successful examples of genome editing achieved through virus-based delivery in different plant species,highlight the advantages and limitations of these delivery approaches,and discuss the remaining challenges.

关键词： Plant genome engineering Genome editing CRISPR/Cas Virus-based delivery

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Correction to:An ultra‑compact polarization‑insensitive slot‑strip mode converter

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Frontiers of Optoelectronics 2022年第3期15卷 73-74页

作者： zihan tao Bo Wang Bowen Bai Ruixuan Chen Haowen Shu Xuguang Zhang Xingjun Wang State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing 100871 China Frontier Science Center for Nano-Optoelectronics Peking University Beijing 100871 China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010 China Peng Cheng Laboratory Shenzhen 518055 China

Correction to:Frontiers of Optoelectronics(2022)15:5 https://***/10.1007/s12200-022-00008-5 Following publication of the original article[1],the authors identifed an error in *** correct Fig.3 is in this correction,and the original article has been *** Access This article is licensed under a Creative Commons Attribution 4.0 International License,which permits use,sharing,adaptation,distribution and reproduction in any medium or format,as long as you give appropriate credit to the original author(s)and the source,provide a link to the Creative Commons licence,and indicate if changes were made.

关键词： Open app strip

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Hybrid-integrated high-performance microwave photonic filter with switchable response

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Photonics Research 2021年第8期9卷 1569-1580页

作者： YUANSHENG tao HAOWEN SHU XINGJUN WANG MING JIN zihan tao FENGHE YANG JINGBO SHI JUN QIN State Key Laboratory of Advanced Optical Communication Systems and Networks Department of ElectronicsSchool of Electronics Engineering and Computer SciencePeking UniversityBeijing 100871China Frontier Science Center for Nano-optoelectronics Peking UniversityBeijing 100871China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Peng Cheng Laboratory Shenzhen 518055China

The integrated microwave photonic filter(MPF),as a compelling candidate for next-generation radio-frequency(RF)applications,has been widely investigated for ***,most integrated MPFs reported thus far have merely incorporated passive photonic components onto a chip-scale platform,while all necessary active devices are still bulk and *** few attempts to higher photonic integration of MPFs have been executed,the achieved filtering performances are fairly limited,which impedes the pathway to practical ***,we demonstrate,for the first time to our knowledge,an all-integrated MPF combined with high filtering performances,through hybrid integration of an In P chip-based laser and a monolithic silicon photonic circuit consisting of a dual-drive Mach–Zehnder modulator,a high-Q ring resonator,and a *** integrated MPF exhibits a high spectral resolution as narrow as 360 MHz,a wide-frequency tunable range covering the S-band to K-band(3 to 25 GHz),and a large rejection ratio of>40 d ***,the filtering response can be agilely switched between the bandpass and band-stop function with a transient respond time(48μs).Compared with previous MPFs in a similar integration level,the obtained spectral resolution in this work is dramatically improved by nearly one order of magnitude,while the valid frequency tunable range is broadened more than twice,which can satisfy the essential filtering requirements in actual RF *** a paradigm demonstration oriented to real-world scenarios,high-resolution RF filtering of realistic microwave signals aiming for interference rejection and channel selection is *** work points out a feasible route to a miniaturized,high-performance,and cost-effective MPF leveraging hybrid integration approach,thus enabling a range of RF applications from wireless communication to radar toward the higher-frequency region,more compact size,and lower power consumption.

关键词： filter modulator switched

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