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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Gengming Lin Yixiao Zhu Zijun Yan Yimin Hu Xi Chen Qunbi Zhuge Weisheng Hu State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

We optimize and experimentally demonstrate joint GPS scheme under level-dependent PD noise for 200G flexible coherent PON. GPS-16-QAM scheme achieves >1-dB and 0.6-dB receiver sensitivity improvement compared with ...

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Optically Pumped Cesium Beam Clock Using Monochromatic Light

Optically Pumped Cesium Beam Clock Using Monochromatic Light

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IEEE International Frequency Control Symposium

作者： Chen Liu Yuanhao Li Sifei Chen Lifeng Fan Yanhui Wang State Key Laboratory of Advanced Optical Communication System and Network School of Electronics Peking University Beijing China

We propose a new method about optically pumped cesium beam clock. Due to the magnetic field of selecting magnet, the pumping light and detection light use the same frequency laser which makes system structure simpler....

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Multilevel Polar-Coded PAM-8 with MSB Shaping over Turbulent FSO Communication Link

Multilevel Polar-Coded PAM-8 with MSB Shaping over Turbulent...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Weiying Yang Xiaoyu Liu Zhiyang Liu Shilin Xiao The State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

Thanks to the flexibility and adaptability of polar codes, a Free-space Optical (FSO) communication scheme combining it with probabilistic shaping (PS) and pulse amplitude modulation (PAM) is proposed to achieve capacity improvement in atmospheric turbulence (AT) channels. The proposed scheme generates a non-uniform probability distribution PAM-8 transmission symbol by a multilevel polar-coded modulation (MLPC) method equipped with the most significant bit (MSB) level shaping precoder. Under the selected turbulence conditions, it provides up to 1.09dB theoretical shaping gain of capacity at the specified information rate (AIR) of 1.859 bit/channel use and 0.82dB performance gain in block error rate.

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Flexible and High-Fidelity Concurrent Dual-Band Delta-Sigma Modulator for Diverse Applications Convergence

Flexible and High-Fidelity Concurrent Dual-Band Delta-Sigma ...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Zijun Yan Yixiao Zhu Yikun Zhang Yimin Hu Gengming Lin Qi Wu Ziyu Cheng Weisheng Hu State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

We propose and experimentally demonstrate a concurrent dual-band delta-sigma modulation for fronthaul. The proposed modulator can flexibly adjust the center frequency of each passband with ~3.0-dB SNR improvement, sup...

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

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Photonics Research 2024年第S1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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Reconfigurable silicon integrated RF photonic filter toward wireless communication

Reconfigurable silicon integrated RF photonic filter toward ...

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International Topical Meeting on Microwave Photonics (MWP)

作者： Zihan Tao Yuansheng Tao Ming Jin Ruixuan Chen Haowen Shu Xingjun Wang State Key Laboratory of Advanced Optical Communications System and Networks School of Electronics Peking University Beijing China

Integrated microwave photonic filters (IMPFs) are capable of offering unparalleled reconfigurability. However, to achieve high reconfigurability, complicated system structures and modulation formats are always required, which put great pressure on power consumption and controlment. Here, we propose a streamlined architecture for a wideband and highly reconfigurable IMPF on the silicon photonics platform. For various practical filter responses and avoiding complex auxiliary devices and bias drift problems, a phase-modulated flexible sideband cancellation method is employed based on the intensity-consistent single-stage-adjustable cascaded-microring (ICSSA-CM). The IMPF exhibits an operation band extends to mm-wave (≥ 30 GHz) and other extraordinary performances including high spectral resolution of 220 MHz and large rejection ratio of 60 dB are obtained. Moreover, Gbps-level RF wireless communications are demonstrated for the first time towards real-world scenarios.

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Get Rid of Isolation: A Continuous Multi-task Spatio-Temporal Learning Framework

arXiv

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arXiv 2024年

作者： Yi, Zhongchao Zhou, Zhengyang Huang, Qihe Chen, Yanjiang Yu, Liheng Wang, Xu Wang, Yang Hefei China Suzhou Institute for Advanced Research USTC Suzhou China State Key Laboratory of Resources and Environmental Information System Beijing China

Spatiotemporal learning has become a pivotal technique to enable urban intelligence. Traditional spatiotemporal models mostly focus on a specific task by assuming a same distribution between training and testing sets. However, given that urban systems are usually dynamic, multi-sourced with imbalanced data distributions, current specific task-specific models fail to generalize to new urban conditions and adapt to new domains without explicitly modeling interdependencies across various dimensions and types of urban data. To this end, we argue that there is an essential to propose a Continuous Multi-task Spatio-Temporal learning framework (CMuST) to empower collective urban intelligence, which reforms the urban spatiotemporal learning from single-domain to cooperatively multi-dimensional and multi-task learning. Specifically, CMuST proposes a new multi-dimensional spatiotemporal interaction network (MSTI) to allow cross-interactions between context and main observations as well as self-interactions within spatial and temporal aspects to be exposed, which is also the core for capturing task-level commonality and personalization. To ensure continuous task learning, a novel Rolling Adaptation training scheme (RoAda) is devised, which not only preserves task uniqueness by constructing data summarization-driven task prompts, but also harnesses correlated patterns among tasks by iterative model behavior modeling. We further establish a benchmark of three cities for multi-task spatiotemporal learning, and empirically demonstrate the superiority of CMuST via extensive evaluations on these datasets. The impressive improvements on both few-shot streaming data and new domain tasks against existing SOAT methods are achieved. Code is available at https://***/DILab-USTCSZ/CMuST. © 2024, CC BY.

关键词： Spatio-temporal data

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Pt thin-film resistance thermo detectors with stable interfaces for potential integration in SiC hightemperature pressure sensors

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Microsystems & Nanoengineering 2024年第5期10卷 231-242页

作者： Ziyan Fang Xiaoyu Wu Hu Zhao Xudong Fang Chen Wu Dong Zhang Zhongkai Zhang Bian Tian Libo Zhao Tiefu Li Prateek Verma Ryutaro Maeda Zhuangde Jiang State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesXi'an Jiaotong UniversityXi'an 710049China School of Mechanical Engineering Xi'an Jiaotong UniversityXi'an 710049China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing at Yantai Yantai 264000China Xi'an Jiaotong University(Yantai)Research Institute for Intelligent Sensing Technology and System Xi'anChina School of Instrument Science and Technology Xi'an Jiaotong UniversityXi'an 710049China School of Integrated Circuits Tsinghua UniversityBeijing 100084China Department of Chemical Engineering University of ArkansasFayettevilleAR72701USA

Due to the excellent mechanical,chemical,and electrical properties of third-generation semiconductor silicon carbide(SiC),pressure sensors utilizing this material might be able to operate in extreme environments with temperatures exceeding 300℃.However,the significant output drift at elevated temperatures challenges the precision and stability of ***-time in situ temperature monitoring of the pressure sensor chip is highly important for the accurate compensation of the pressure *** this study,we fabricate platinum(Pt)thin-film resistance temperature detectors(RTDs)on a SiC substrate by incorporating aluminum oxide(Al_(2)O_(3))as the transition layer and utilizing aluminum nitride(AIN)grooves for alignment through microfabrication *** composite layers strongly adhere to the substrate at temperatures reaching 950℃,and the interface of the Al2O3/Pt bilayer remains stable at elevated temperatures of approximately 950 *** stability contributes to the excellent high-temperature electrical performance of the Pt RTD,enabling it to endure temperatures exceeding 850℃ with good *** characteristics establish a basis for the future integration of Pt RTD in SiC pressure ***,tests and analyses are conducted on the interfacial diffusion,surface morphological,microstructural,and electrical properties of the Pt flms at various annealing *** can be inferred that the tensile stress and self-diffusion of Pt films lead to the formation of hillocks,ultimately reducing the electrical performance of the Pt thin-flm *** increase the upper temperature threshold,steps should be taken to prevent the agglomeration of Pt films.

关键词： resistance carbide film

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SecMVX:Analysis on the Vulnerability of Multi-Variant Execution

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China Communications 2021年第8期18卷 85-95页

作者： Bingzheng Li Zheng Zhang Xiaomei Wang Sheng Qu Jiangxing Wu State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou 450001China China National Digital Switching System Engineering and Technological R&D Center Zhengzhou 450002China

As an active defenses technique,multivariant execution(MVX)can detect attacks by monitoring the consistency of heterogeneous variants with parallel *** with patch-style passive defense,MVX can defend against known and even unknown vulnerability-based attacks without relying on attack feature ***,variants generated with software diversity technologies will introduce new vulnerabilities when they execute in ***,we analyze the security of MVX theory from the perspective of formal *** we summarize the general forms and techniques for attacks against MVX,and analyze the new vulnerabilities arising from the combination of variant generation *** propose SecMVX,a secure MVX architecture and variant generation *** evaluations based on CVEs and SPEC 2006 benchmark show that SecMVX introduces 11.29%of the average time overhead,and avoids vulnerabilities caused by the improper combination of variant generation technologies while keeping the defensive ability of MVX.

关键词： multi-variant execution software diversity cyberspace security

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Dynamic Analysis and Testing of a Double-layer Isolator with an Electromagnetic Negative Stiffness Mechanism

Dynamic Analysis and Testing of a Double-layer Isolator with...

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International Conference on advanced robotics and Mechatronics (ICARM)

作者： Qimin Li Anpeng Sun Huayan Pu Jun Luo Lisheng Mou Jiahao Zhu Jinglei Zhao Xueping Li Ruqing Bai Jin Yi Zhe Li Shujin Yuan State Key Laboratory of Mechanical Transmission for Advanced Equipment Chongqing University Chongqing China CSSC System Engineering Research Institute Beijing China

ISBN: (数字)9798350385724

ISBN: (纸本)9798350385731

Electromagnetic negative stiffness mechanism (NSM) has attracted considerable attention because it can expand the vibration isolation frequency band. However, existing electromagnetic NSMs are limited by a small adjustable range. To improve the generation efficiency and adjustable range of negative stiffness, the influence of the magnet size and the position relationship with the wire turns on the stiffness characteristics was analyzed, and an electromagnetic negative stiffness mechanism (ENSM) with an optimized configuration of the coils and magnets was proposed. The stiffness adjustable range of the ENSM is $\pm \mathbf{6 3 5 0} \mathbf{N m}^{-1}$, and the stiffness generation efficiency of the ENSM reaches 4.65 $\mathbf{N m}^{-1} \mathbf{A}^{-1}$. A double-layer vibration isolator with the ENSM connected in parallel is designed and manufactured, and its nonlinear dynamics are analyzed. The vibration isolation performance was experimentally tested and proved that the ENSM effectively expanded the vibration isolation frequency bandwidth.

关键词： Vibrations Isolators Magnetic resonance Real-time systems Magnetic analysis Nonlinear dynamical systems Wire Electromagnetics robots Testing

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