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Conference on Lasers and Electro-Optics (CLEO)

作者： Yuyao Guo Xinhang Li Minhui Jin Chuxin Liu Weihan Xu Liangjun Lu Jingya Xie Jianping Chen Linjie Zhou Department of Electronic Engineering State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu China Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation Center Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology Shanghai China

We present a III-V/Si 3 N 4 O-band hybrid laser, which shows a high output power of 42 mW, wide tuning range of 62 nm with side-mode suppression ratio >50 dB, and narrow intrinsic linewidth of ~600 Hz.

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Power lasers Lasers and electrooptics Hybrid power systems Laser tuning Electrooptical waveguides Power generation

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Cryptanalysis of a quantum key distribution and authentication protocol through once quantum communication

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Shanghai Jiaotong Daxue Xuebao/Journal of Shanghai Jiaotong University 2005年第9期39卷 1509-1513页

作者： Zhou, Nan-Run Zeng, Gui-Hua Zhu, Fu-Chen State Key Lab. on Local Fiber-Optic Communication Network and Advanced Optical Communication Systems Shanghai Jiaotong Univ. Shanghai 200030 China National Lab. for Modern Communications Chengdu 610041 China

This paper analyzed the security hole of a quantum key distribution and quantum authentication protocol through once quantum communication, which can withstand interception/resend attack strategy and entanglement attack strategy but can not resist the entanglement/interception attack strategy. Strictly speaking, only through once quantum communication, could not the QKD and QA protocol be achieved in the context of jammable channel. According to the conditions of the original protocol, two new protocols were proposed: one measures the shared GHZ states directly and the other adds a check process to resist the entanglement/interception attack strategy.

关键词： Quantum cryptography

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Frequency-Aware Physics-Inspired Degradation Model for Real-World Image Super-Resolution

arXiv

引用

arXiv 2021年

作者： Dong, Zhenxing Cao, Hong Shen, Wang Gan, Yu Ling, Yuye Zhai, Guangtao Su, Yikai John Hopcroft Center for Computer Science Shanghai Jiao Tong University China Institute of Image Communication and Network Engineering Shanghai Jiao Tong University China Department of Electrical and Computer Engineering University of Alabama TuscaloosaAL35401 United States State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University China

Current learning-based single image super-resolution (SISR) algorithms underperform on real data due to the deviation in the assumed degradation process from that in the real-world scenario. Conventional degradation processes consider applying blur, noise, and downsampling (typically bicubic downsampling) on high-resolution (HR) images to synthesize low-resolution (LR) counterparts. However, few works on degradation modelling have taken the physical aspects of the optical imaging system into consideration. In this paper, we analyze the imaging system optically and exploit the characteristics of the real-world LR-HR pairs in the spatial frequency domain. We formulate a real-world physics-inspired degradation model by considering both optics and sensor degradation;The physical degradation of an imaging system is modelled as a low-pass filter, whose cut-off frequency is dictated by the object distance, the focal length of the lens, and the pixel size of the image sensor. In particular, we propose to use a convolutional neural network (CNN) to learn the cutoff frequency of real-world degradation process. The learned network is then applied to synthesize LR images from unpaired HR images. The synthetic HR-LR image pairs are later used to train an SISR network. We evaluate the effectiveness and generalization capability of the proposed degradation model on real-world images captured by different imaging systems. Experimental results showcase that the SISR network trained by using our synthetic data performs favorably against the network using the traditional degradation model. Moreover, our results are comparable to that obtained by the same network trained by using real-world LR-HR pairs, which are challenging to obtain in real scenes. © 2021, CC BY.

关键词： Cutoff frequency

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Reliability and real-time assurance of fly-by-light network for flight control system

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Guangxue Xuebao/Acta Optica Sinica 2008年第SUPPL. 2期28卷 196-200页

作者： Luo, Jiarong Luo, Xuan He, Hao Jin, Yaohui Huang, Haoyi Wu, Jianmin State Key Laboratory on Fiber-Optic Local Area Network and Advanced Optical Communication Systems Shanghai Jiaotong University Shanghai 200240 China National Defense Science and Technology Key Laboratory for Avionics System Integration Technology Shanghai 200233 China

A survey is made on several traditional topologies of fly-by-light(FBL) network. Based on the comparison of their reliability and real-time performance, a mesh optical switching network topology with 256 nodes is chosen. The redundancy topology gives the ability to sustain 3 link faults, which assures the reliability of network. The seriousness of the network failure can be measured by the number of link faults. And when several link faults occur at the same time, it must also be measured by the contiguity degree among the faults. A simulation is taken to test the end-to-end latency under all network failure situations. The simulation results show that even when some serious fault occurs, the number of hops of the end-to-end route increases slightly. So it still meets the real-time communication requirements.

关键词： Flight control systems

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Different ways to active optical frequency standards

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Journal of Physics: Conference Series 2016年第1期723卷

作者： Duo Pan Xiaobo Xue Xiaogang Zhang Jingbiao Chen State Key Laboratory of Advanced Optical Communication System and Network School of Electronics Engineering and Computer Science Peking University Beijing 100871 China

Active optical frequency standard, or active optical clock, is a new concept of optical frequency standard, where a weak feedback with phase coherence information in optical bad-cavity limitation is formed, and the continuous self-sustained coherent stimulated emission between two atomic transition levels with population inversion is realized. Through ten years of both theoretical and experimental exploration, the narrow linewidth and suppression of cavity pulling effect of active optical frequency standard have been initially proved. In this paper, after a simple review, we will mainly present the most recent experimental progresses of active optical frequency standards in Peking University, including 4-level cesium active optical frequency standards and active Faraday optical frequency standards. The future development of active optical frequency standards is also discussed.

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Deterministic bulk-boundary correspondences for skin and edge modes in a general two-band non-Hermitian system

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Physical Review Research 2022年第4期4卷 043222-043222页

作者： Chong Hou Lingfang Li Shihua Chen Yi Liu Luqi Yuan Yiqi Zhang Zhenhua Ni School of Physics and Frontiers Science Center for Mobile Information Communication and Security Southeast University Nanjing 211189 China Purple Mountain Laboratories Nanjing 211111 China Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology Shanghai 200093 China CAS Center for Excellence in Ultra-Intense Laser Science Shanghai 201800 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique School of Electronic Science and Engineering Faculty of Electronic and Information Engineering Xi'an Jiaotong University Xi'an 710049 China

In isolated Hermitian systems, the bulk-boundary correspondence is generally thought of as a compelling principle guiding the occurrence of robust edge states through the topological invariants of the bulk. However, in open non-Hermitian systems that support non-Hermitian skin effects, the universality of the bulk-boundary correspondence has so far remained disputable in spite of being subjected to intensive studies. Here we provide analytical and numerical evidence of bulk-boundary correspondences for both skin and edge modes in 1D two-band non-Hermitian systems within the framework of a prototypical non-Hermitian Su-Schrieffer-Heeger model. Two different topological winding numbers, one on a Brillouin zone and the other on a generalized Brillouin zone, are defined to fully characterize the topological phases of matter and to understand such deterministic correspondences. In addition to the exact solutions for bulk states, we also obtain explicit solution forms for edge modes along with analytical conditions for their existence and localization, all exhibiting remarkable agreement with numerical results. Our results solve the elusive non-Hermitian topology and may facilitate experimental investigations of bulk-boundary correspondence in a wide range of non-Hermitian systems.

关键词： Edge states Skin effect Topological phases of matter Non-Hermitean systems Topological materials

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Quantum precision measurement of two-dimensional forces with 10−28-Newton stability

arXiv

引用

arXiv 2022年

作者： Guo, Xinxin Yu, Zhongcheng Wei, Fansu Jin, Shengjie Chen, Xuzong Li, Xiaopeng Zhang, Xibo Zhou, Xiaoji State Key Laboratory of Advanced Optical Communication System and Network School of Electronics Peking University Beijing100871 China State Key Laboratory of Surface Physics Institute of Nanoelectronics and Quantum Computing Department of Physics Fudan University Shanghai200433 China Shanghai Qi Zhi Institute AI Tower Xuhui District Shanghai200232 China Shanghai Research Center for Quantum Sciences Shanghai201315 China International Center for Quantum Materials School of Physics Peking University Beijing100871 China

High-precision sensing of vectorial forces has broad impact on both fundamental research and technological applications such as the examination of vacuum fluctuations [1] and the detection of surface roughness of nanostructures [2]. Recent years have witnessed much progress on sensing alternating electromagnetic forces for the rapidly advancing quantum technology-orders-of-magnitude improvement has been accomplished on the detection sensitivity with atomic sensors [3, 4, 5], whereas precision measurement of static electromagnetic forces lags far behind with the corresponding long-term stability rarely demonstrated. Here, based on quantum atomic matter waves confined by an optical lattice, we perform precision measurement of static electromagnetic forces by imaging coherent wave mechanics in the reciprocal space. We achieve a state-of-the-art measurement sensitivity of 2.30(8) × 10−26 N/√Hz. Long-term stabilities on the order of 10−28 N are observed in the two spatial components of a force, which allows probing atomic Van der Waals forces at a millimeter distance [6]. As a further illustrative application, we use our atomic sensor to calibrate the control precision of an alternating electromagnetic force applied in the experiment. Future developments of our method hold promise for delivering unprecedented atom-based quantum force sensing technologies. © 2022, CC BY-SA.

关键词： optical lattices

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Glass Forming Region and Er3+ 2.7 Μm Emission Properties of Al2o3-Cao-Sro Infrared Glass

SSRN

引用

SSRN 2024年

作者： Liu, Yin Wan, Jie Xiao, Yongbao Yu, Dechao College of Metallurgy and Materials Engineering Chongqing University of Science and Technology Chongqing401331 China Laboratory of Infrared Materials and Devices Advanced Technology Research Institute Ningbo University Ningbo315211 China State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques Institute of Optical Communication Materials South China University of Technology Guangzhou510641 China College of Materials Science and Engineering Chongqing University Chongqing400045 China Engineering Research Center of Optical Instrument and System Ministry of Education Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology Shanghai200093 China

Glass forming regions of Al2O3-CaO-SrO (AlCaSr) system were systematically studied and clearly depicted by a combination of thermodynamic calculation method and traditional melt-quenching experiments. The glass forming region was first found with a composition range of Al2O3: 12-32 mol%, CaO: 43-68 mol%, and SrO: 20-36 mol%. Moreover, two representative glass compositions, 26.6Al2O3-49.4CaO-24SrO (AlCaSr-1) and 17.48Al2O3-58.52CaO-24SrO (AlCaSr-2), in central part of the experimental glass forming region and the corresponding glass doped with 1 mol% Er2O3, i.e., AlCaSr-1-Er and AlCaSr-2-Er, were selected and carefully prepared in our lab. Detailed investigations proved that the AlCaSr glasses had excellent comprehensive properties with high Tg temperature (~ 800 °C), wide transparency wavelength range (0.3-6 μm), and low maximum phonon energy (~ 770 cm-1), and good 2.7 μm mid-infrared emitting properties via doping Er3+ activators. These results highlight the potential application of AlCaSr glasses as infrared materials, and could benefit the development of high-performance infrared glasses. © 2024, The Authors. All rights reserved.

关键词： Aluminum oxide

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Spin-induced orbital frustration in a hexagonal optical lattice

arXiv

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arXiv 2021年

作者： Li, Yongqiang Yuan, Jianmin Zhou, Xiaoji Li, Xiaopeng Department of Physics National University of Defense Technology Changsha410073 China Department of Physics Graduate School of China Academy of Engineering Physics Beijing100193 China State Key Laboratory of Advanced Optical Communication System and Network Department of Electronics Peking University Beijing100871 China State Key Laboratory of Surface Physics Institute of Nanoelectronics and Quantum Computing Department of Physics Fudan University Shanghai200438 China Shanghai Qi Zhi Institute AI Tower Xuhui District Shanghai200232 China

Complex lattices provide a versatile ground for fascinating quantum many-body physics. Here, we propose an exotic mechanics for generating orbital frustration in hexagonal lattices. We study two-component (pseudospin-1/2) Bose gases in p-orbital bands of two-dimensional hexagonal lattices, and find that the system exhibits previously untouched orbital frustration as a result of the interplay of spin and orbital degrees of freedom, in contrast to normal Ising-type orbital ordering of spinless porbital band bosons in two-dimensional hexagonal lattices. Based on the classification by symmetry analysis, we find the interplay of orbital frustration and strong interaction leads to exotic Mott and superfluid phases with spin-orbital intertwined orders, in spite of the complete absence of spin-orbital interaction in the Hamiltonian. Our study implies many-body correlations in a multi-orbital setting could induce rich spin-orbital intertwined physics in complex lattice structures. Copyright © 2021, The Authors. All rights reserved.

关键词： Bosons

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Large Scale Video Delivery Using Hybrid Packet/Circuit Multicasting: Experiences from Chinese Broadband network Testbed (3TNet)

Large Scale Video Delivery Using Hybrid Packet/Circuit Multi...

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33rd European Conference and Exhibition of optical communication

作者： Yaohui Jin Weisheng Hu Weiqiang Sun Wei Guo Jiangxing Wu Hongbing Li Jinlin Wang Minwei Xu Yi Li Liang Wei Guoying Zhang Yunbin Xu Huandong Zhao Ran An Fang Yin Jun Wang Xueqing Wei State Key Laboratory on Advanced Optical Communication System and Network Shanghai Jiao Tong University Shanghai 200240 China Task Force of 3TNet the 863 Program China Research Institute of Telecomm. Transmission Ministry of Information Industry China Shanghai Telecomm. Technology Research Institute China Telecom China Shanghai Interactive Television Shanghai Media Group China Huawei Technologies China Fiberhome Telecomm. Technologies China

To support large scale video delivery, we carried out a hybrid packet/circuit multicasting field trial with 26000 users. Each end user has 40 Mb/s guaranteed bandwidth. The results of 1040 concurrent users testing war... 详细信息

关键词： Logic gates Europe Streaming media

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