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Multifunctional mixed analog/digital signal processor based on integrated photonics

Opto-Electronic Science 2024年第8期3卷 1-12页

作者： Yichen Wu Qipeng Yang Bitao Shen Yuansheng Tao Xuguang Zhang Zihan Tao Luwen Xing Zhangfeng Ge Tiantian Li bowen bai Haowen Shu Xingjun Wang State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China College of Engineering Peking UniversityBeijing 100871China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China School of Electronic Engineering Xi’an University of Posts&TelecommunicationsXi’an 710121China Frontiers Science Center for Nano-optoelectronics Peking UniversityBeijing 100871China Peng Cheng Laboratory Shenzhen 518055China

Photonic signal processing offers a versatile and promising toolkit for contemporary scenarios ranging from digital optical communication to analog microwave *** to its electronic counterpart,it eliminates inherent bandwidth limitations and meanwhile exhibits the potential to provide unparalleled scalability and flexibility,particularly through integrated ***,by far the on-chip solutions for optical signal processing are often tailored to specific tasks,which lacks versatility across diverse ***,we propose a streamlined chip-level signal processing architecture that integrates different active and passive building blocks in silicon-on-insulator(SOI)platform with a compact and efficient *** and in-depth analyses for the architecture are conducted at levels of device,system,and *** by appropriate configuring schemes,the photonic circuitry supports loading and processing both analog and digital signals *** distinct tasks are facilitated with one single chip across several mainstream fields,spanning optical computing,microwave photonics,and optical ***,it has demonstrated competitive performance in functions like image processing,spectrum filtering,and electro-optical bandwidth *** high universality and a compact form factor,the proposed architecture is poised to be instrumental for next-generation functional fusion systems.

关键词： silicon photonics multifunctional signal process microwave photonics optical computing optical communica-tion equalization

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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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Towards silicon photonic neural networks for artificial intelligence

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Science China(Information Sciences) 2020年第6期63卷 105-118页

作者： bowen bai Haowen SHU Xingjun WANG Weiwen ZOU State Key Laboratory of Advanced Optical Communications System and Networks School of Electronics Engineering and Computer Science Peking University Frontiers Science Center for Nano-optoelectronics Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks Intelligent Microwave Lightwave Integration Innovation Center(iMLic) Department of Electronic Engineering Shanghai Jiao Tong University

Brain-inspired photonic neural networks for artificial intelligence have attracted renewed interest. For many computational tasks, such as image recognition, speech processing and deep learning, photonic neural networks have the potential to increase the computing speed and energy efficiency on the orders of magnitude compared with digital electronics. Silicon Photonics, which combines the advantages of electronics and photonics, brings hope for the large-scale photonic neural network integration. This paper walks through the basic concept of artificial neural networks and focuses on the key devices which construct the silicon photonic neuromorphic systems. We review some recent important progress in silicon photonic neural networks, which include multilayer artificial neural networks and brain-like neuromorphic systems, for artificial intelligence. A prototype of silicon photonic artificial intelligence processor for ultra-fast neural network computing is also proposed. We hope this paper gives a detailed overview and a deeper understanding of this emerging field.

关键词： photonic neural networks artificial intelligence deep learning photonic computing accelerator silicon photonics

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Grenvillian and early Paleozoic polyphase metamorphism recorded by eclogite and host garnet mica schist in the North Qaidam orogenic belt

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Geoscience Frontiers 2021年第4期12卷 244-259页

作者： Yunfei Ren Danling Chen Haijie Wang Xiaohui Zhu bowen bai State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi'an 710069China Xi'an Center of Geological Survey China Geological SurveyXi'an 710054China

The North Qaidam orogenic belt(NQOB) is generally considered to be an early Paleozoic ultrahigh pressure metamorphic belt,but increasing reports of the Neoproterozoic magmatic and metamorphic events indicate that the NQOB probably also experienced the assembly of the ***,the Neoproterozoic evolution of the NQOB is not well constrained due to the sparse records and ambiguous nature of the Neoproterozoic *** order to reveal the multi-orogenic history of the NQOB,an integrated study of petrology,phase equilibrium modelling and geochronology was conducted on an epidote eclogite and host garnet mica schist from the Yuka–Luofengpo *** zircon and monazite U–Pb ages show that the protolith of the garnet mica schist was deposited during 994–920 Ma and experienced Neoproterozoic(920–915 Ma) and early Paleozoic(451–447 Ma) polyphase metamorphism together with the enclosed *** omphacite inclusions were first identified in garnet and early Paleozoic zircon domains from the garnet mica schist,which provide solid evidence for the early Paleozoic eclogite facies metamorphism of the mica *** early Paleozoic peak P–T conditions of >27.4 kbar/613–670 ℃ and 30.2–30.8 kbar/646–655 ℃ were obtained for the garnet mica schist and enclosed eclogite,respectively,indicating that eclogites and their host paragneisses in this region underwent continental deep subduction as a coherent metamorphic terrane in early *** peak P–T conditions of the Neoproterozoic metamorphism were roughly constrained at 7.7–12.0 kbar and 634–680 ℃ for the garnet mica schist,based on stability field of mineral inclusions in Neoproterozoic zircons domains in P–T pseudosection,the relic garnet core composition and Ti-in-zircon *** high thermal gradients(16–37 ℃/km) defined by presently our and previously reported P–T conditions indicate that the Neoproterozoic metamorphism likely occurred in continental collision setting at >945–890 *** the

关键词： Grenvillian metamorphism Two orogenic cycles Pseudosection North Qaidam Rodinia

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Low-loss hybrid plasmonic TM-pass polarizer using polarization-dependent mode conversion

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Photonics Research 2020年第7期8卷 1197-1202页

作者： Ruixuan Chen bowen bai Zhiping Zhou State Key Laboratory of Advanced Optical Communication Systems and Networks Department of ElectronicsSchool of Electronics Engineering and Computer SciencePeking UniversityBeijing 100871China Peking University Shenzhen Research Institute Shenzhen 518057China Nano-optoelectronics Frontier Center of Ministry of Education Peking UniversityBeijing 100871China

A low-loss hybrid plasmonic transverse magnetic(TM)-pass polarizer has been demonstrated utilizing polarization-dependent mode *** advantage of the silicon hybrid plasmonic slot waveguide(HPSW),the unwanted transverse electric(TE)fundamental mode can be efficiently converted first to a TM higher-order mode and then suppressed by a power combiner,while the retained TM fundamental mode can pass through with negligible *** the HPSW feature both strong structural asymmetry and a small interaction area in the cross-section between the metal and optical field,the optimized insertion loss of the device is as low as 0.4 d *** the wavelength of 1550 nm,the extinction ratio is 28.3 d B with a moderate footprint of 2.38μm×10μ*** the entire C band,the average reflection of the TE mode is suppressed below-14 d B,and the extinction ratio is over 18.6 d *** work provides another more efficient and effective approach for better on-chip polarizers.

关键词： polarization polarizer pass

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Inverse synthetic aperture radar range profile compensation of plasma-sheath-enveloped reentry object

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Plasma Science and Technology 2022年第7期24卷 148-161页

作者： Yaocong XIE Xiaoping LI Fangfang SHEN bowen bai Lei SHI Xuyang CHEN School of Aerospace Science and Technology Xidian UniversityXi'an 710071People's Republic of China

The scattering points in a plasma sheath characterized with coupled velocities can cause pulse compression mismatching,which results in displacement and energy diffusion in the onedimension range *** solve this problem,we deduce the echo model of the plasma-sheathenveloped reentry *** estimating the coupled velocities,we propose a compensation method to correct the defocus of an inverse synthetic aperture radar(ISAR)image in range dimension to improve the quality of the ISAR *** simulation results suggest that the echoes from different regions of the surface of the reentry object have various coupling velocities,and the higher the coupled velocity,the more serious the displacement and energy diffusion in the range *** proposed method can correct the range dimension *** measurement metrics were used to evaluate the improvement of the compensation method.

关键词： plasma sheath inverse synthetic aperture radar imaging defocus coupled velocity reentry object

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Demonstration of an on-chip TE-pass polarizer using a silicon hybrid plasmonic grating

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Photonics Research 2019年第3期7卷 289-293页

作者： bowen bai FENGHE YANG ZHIPING ZHOU State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Peking University Shenzhen Research Institute

An on-chip, high extinction ratio transverse electric(TE)-pass polarizer using a silicon hybrid plasmonic grating is proposed and experimentally demonstrated. Utilizing plasmonics to manipulate the effective index and mode distribution, the transverse magnetic mode is reflected and absorbed, while the TE mode passes through with relatively low propagation loss. For a 6-μm-long device, the measurement result shows that the extinction ratio in the wavelength range of 1.52 to 1.58 μm varies from 24 to 33.7 dB and the insertion loss is 2.8–4.9 dB. Moreover,the structure exhibits large alignment tolerance and is compatible with silicon-on-insulator fabrication technology.

关键词： TE-pass polarizer using silicon hybrid plasmonic grating transverse magnetic mode

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基于改进YOLOv5s的绝缘子缺陷检测方法

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机电工程技术 2024年第8期53卷 197-200页

作者：王子玉陈佳星白博文徐爱婷辽宁工程技术大学电气与控制工程学院辽宁葫芦岛125105

绝缘子在高压和超高压架空输电线路中的安全运行至关重要,因此对绝缘子图像的准确识别显得尤为关键。为了提高绝缘子缺陷检测的精度,提出了一种基于改进YOLOv5s模型的绝缘子缺陷检测方法。通过引入scSE注意力机制,以实现通道和空间方面... 详细信息

绝缘子在高压和超高压架空输电线路中的安全运行至关重要,因此对绝缘子图像的准确识别显得尤为关键。为了提高绝缘子缺陷检测的精度,提出了一种基于改进YOLOv5s模型的绝缘子缺陷检测方法。通过引入scSE注意力机制,以实现通道和空间方面的校准,强化了该模型在对绝缘子缺陷的辨识能力,从而进一步提高对绝缘子图像识别的精度,特别是在遮挡和相似目标干扰的情况下表现更为出色;在此基础上增加了Mosaic数据增强处理,为模型的训练提供更多数据,使模型在多场景下表现优异。经实验证实,该算法准确率达到了92.8%,召回率达到97.5%,mAP达到了98.8%,其检测精度明显优于其他模型,并在复杂场景下展现了出色的鲁棒性,为绝缘子检修工作提供了新的思路。

关键词：绝缘子检测 YOLOv5s模型 scSE注意力机制图像处理

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High-Efficiency Rescue of Equine Infectious Anemia Virus from a CMV-Driven Infectious Clone

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Virologica Sinica 2019年第6期34卷 725-728页

作者： Xue-Feng Wang bowen bai Yuezhi Lin Ting Qi Cheng Du Mingxin Song Xiaojun Wang College of Veterinary Medicine Northeast Agricultural UniversityHarbin 150030China State Key Laboratory of Veterinary Biotechnology Harbin Veterinary Research Institute of the Chinese Academy of Agricultural SciencesHarbin 150069China

Dear Editor,Equine infectious anemia virus(EIAV)belongs to the macrophage-tropic lentiviruses family and infects mainly equines,including horses,donkeys and *** shares many similar characteristics in its viral biology and host-virus immune regulation with other lentiviruses,such as human immunodeficiency virus type 1(HIV-1)and simian immunodeficiency virus(SIV),and has been accepted as a model for the study of other lentiviruses,especially HTV-1(Craigo and Montelaro 2013).Specifically,in the 1970s,Chinese scientists developed an attenuated EIAV vaccine and by using this vaccine,China has successfully controlled EIAV *** vaccine provides a meaningful reference for lentivirus research(Wang et al.2016).

关键词： EIAV Infectious Rescue

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Study of a 560-mm-long stripline kicker for HIT 10 MeV electron accelerator

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Radiation Detection Technology and Methods 2021年第3期5卷 373-378页

作者： Jianbin Zhu Hua Shi bowen bai Shu Zhang Zhandong Zhang Bin Chen Yunlong Chi Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Purpose A stripline kicker is required for Harbin Institute of Technology(HIT)10 MeV electron accelerator to scan electrons horizontally in two directions,and the maximum deflecting angle is 65 *** this study,a 560-mm-long stripline kicker was designed to achieve good field uniformity and odd mode impedance *** In order to reduce power reflections and meet field uniformity requirement,we optimized the cross section of the kicker main *** and optimization of the stripline kicker were finished by *** The field uniformity is 2%in the 60 mm(x)×80 mm(y)region,as *** impedance matching and manufacturing,the transmission odd mode impedance was finally chosen to 45Ω,which indicated a reflecting loss of less than−50 dB below 1 *** maximum field is less than 7 MV/m with a maximum pulse voltage of±22 kV between the two electrodes when the electrons pass through the *** The physical design of the stripline kicker has been finished,and the simulation results satisfied the requirements.

关键词： Linac Stripline kicker Field uniformity

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