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| 1 | A novel two-layered optical satellite network of LEO/MEO with zero phase factor显示文摘Optical satellite communication has advantages over the RF satellite communication in capacity, speed, secrecy and anti-interference.Space information superhighway composed of GEO/MEO/LEO satellites which are linked by optical inter-satellite links(OISL) would play important roles in communication, navigation, martial recon, remote sensing and deep space exploration.A novel LEO/MEO two-layered optical satellite network with global coverage is designed with the street-of-coverage technique.The layer of LEO satellites is the walker-delta constellation with zero phase factor and has the quasi-stable logical structure of Mesh.Equatorial and polar orbit satellites constitute the layer of MEO satellite, which can cover LEO layer effectively.Rising satellites of the system can provide 99.9% of coverage for the whole globe and 100% for China averagely.The network can provide a minimum elevation angle at 21 ? with single-satellite visibility for China, and at 16 ? with the dual-satellite visibility.Simulation results of the inter-satellite links show LEO constellation of zero phase factor outperforms non-zero phase factor constellations in azimuth angle, elevation angle and distance, which is very fit for the OISL.Simulation results of the communication performance indicate a little difference between short wave band and long wave band at low communication speed(several Gbit/s);however, the wave band at 1550 nm is a better choice at high communication speed(100 Gbit/s). | LI YongJun , WU JiLi, ZHAO ShangHong, MENG Wen, MA LiHua, SHI Lei, CHU XingChun, HOU Rui & LI Tian Telecommunication Engineering Institute, Air Force Engineering University, Xi’an 710077, China | 2010 | Science China(Information Sciences)2010，53，6： | 8 |
| 2 | Integrating deep learning to achieve phase compensation for free-space orbital-angular-momentum-encoded quantum key distribution under atmospheric turbulence显示文摘A high-dimensional quantum key distribution(QKD), which adopts degrees of freedom of the orbital angular momentum(OAM) states, is beneficial to realize secure and high-speed QKD. However, the helical phase of a vortex beam that carries OAM is sensitive to the atmospheric turbulence and easily distorted. In this paper, an adaptive compensation method using deep learning technology is developed to improve the performance of OAM-encoded QKD schemes. A convolutional neural network model is first trained to learn the mapping relationship of intensity profiles of inputs and the turbulent phase, and such mapping is used as feedback to control a spatial light modulator to generate a phase screen to correct the distorted vortex beam. Then an OAM-encoded QKD scheme with the capability of real-time phase correction is designed, in which the compensation module only needs to extract the intensity distributions of the Gaussian probe beam and thus ensures that the information encoded on OAM states would not be eavesdropped. The results show that our method can efficiently improve the mode purity of the encoded OAM states and extend the secure distance for the involved QKD protocols in the free-space channel, which is not limited to any specific QKD protocol. | XINGYU WANG TIANYI WU CHEN DONG HAONAN ZHU ZHUODAN ZHU SHANGHONG ZHAO | 2021 | Photonics Research2021，9，2： | 5 |
| 3 | Barrier effect of SiO2 shell over hollow CeO2/CuO@SiO2 catalysts for broadening temperature window of total CO conversion显示文摘The hollow inverse CeO2/CuO@SiO2 catalysts with different Ce/Cu mass ratios were synthesized by the two-step hydrothermal and incipient wetness impregnation methods,and characterized by multitechnique characterizations,such as SEM,TEM,XRD,H2-TPR,XPS and N2 adsorption-desorption techniques.It is found that the hollow shell is composed of CuO and SiO2,and CeO2 nanoparticles are coated on the surface of CuO@SiO2 support.And the CeO2/CuO@SiO2 catalyst with the Ce/Cu mass ratios of 1:1 denoted as 1 CeO2/CuO@SiO2,which possesses a maximum amount of highly dispersed copper species and medium-sized CuO as well as the highest concentration of oxygen vacancies,exhibits the highest catalytic activity and widest full CO conversion window.The barrier effect of the SiO2 shell effectively prevents the reduction of CuO species,which broadens temperature window of CO total conversion and enhances CO2 selectivity above 155℃over the 1 CeO2/CuO@SiO2 catalyst in comparison with the CuO-CeO2 and CeO2-CuO catalysts. | Jinfang Wu Xiaozhou Zhao Lei Xue Haiquan Su Shanghong Zeng | 2020 | Journal of Rare Earths2020，38，1： | 2 |
| 4 | Laser jamming analysis of combined fiber lasers to imaging CCD显示文摘 | Xu Jie Zhao Shanghong Hou Rui | 2009 | Optics and Lasers in Engineering2009，47，： | 1 |
| 5 | Watershed Characteristics Extraction and Subsequent Terrain Analysis Based on Digital Elevation Model in Flat Region显示文摘 | Shanghong Zhang Bohua Zhao E. Erdun | 2014 | Journal of Hydrologic Engineering2014，，： | 1 |
| 6 | Spectral beam combining of fiber lasers based on a transmitting volume Bragg grat ing显示文摘 | Zhan Shengbao Zhao Shanghong Chu Xingchun | 2010 | Optics and Laser Technology2010，42，2： | 1 |
| 7 | Calculation and visualization of flood inundation based on a topographic triangle network显示文摘 | Shanghong Zhang Taiwei Wang Bohua Zhao | 2014 | Journal of Hydrology2014，，： | 1 |
| 8 | Analysis of coherent beams combining through superposed volume gratings by cou- pled wave theory显示文摘 | Chu Xingchun Zhan Shengbao Zhao Shanghong | 2008 | Optics and Laser Technology2008，40，3： | 1 |
| 9 | Optimization ofintersatellite microwave photonic links by utilizing an optical preamplifier under dual-tone modulation 显示文摘 | ZHU Zihang ZHAO Shanghong YAO Zhoushi etal | 2012 | Applied Opties(S1559-128X)2012，51，28： | 1 |
| 10 | Laser-jamming analysis of combined fiber lasers to imaging CCD显示文摘 | Xu Jie Zhao Shanghong Hou Rui | 2009 | Optics and Lasers in Engi neering2009，47，： | 1 |
| 11 | Broadband Er:Tm co-doped silica fiber amplifier for DWDM application 显示文摘 | Dong Shufu Zhao Shanghong Shi Lei | 2004 | Proc of SHE2004，，5623： | 1 |
| 12 | Spectral beam combining of fiber lasers based on a transmitting volume Bragg grat- ing显示文摘 | Zhan Shengbao Zhao Shanghong Chu Xingchun | 2010 | Optics and Laser Technology2010，42，： | 1 |
| 13 | Ultralow Ag-assisted carbon-carbon coupling mechanism on Cu-based catalysts for electrocatalytic CO_(2) reduction显示文摘Electrocatalytic CO_(2) reduction to C2H4supplies an economically viable route for CO_(2) fixation with the integration of intermittent renewable energy.Cu-based catalysts are capable of catalyzing CO_(2) to C_(2)H_(4),while suffering from the high overpotential and low Faradaic efficiency.In this joint experimentalcomputational work,an Ag-assisted carbon-carbon coupling is exploited on Cu-based catalysts.A systematic characterization analysis suggests that an ultralow quantity of Ag atoms in the Cu catalysts motivates electron transfer from Cu to Ag,regulating the electronic state of highly dispersed Ag.Meanwhile,the Ag incorporation provokes the formation of more oxygen defects on the catalyst surface,improving the adsorption and activation of CO_(2) molecules.Density functional theory studies prove the improvement effect of Ag for CO_(2)to COOH^(*).^(*)CO hydrogenation is energetically more favorable than^(*)CO dimerization pathway,and two^(*)CHO dimerization produces^(*)OCHCHO^(*) key intermediates,which greatly reduces the energy barrier for C_(2)H_(4) formation. | Lei Xue Qi-Yuan Fan Yuansong Zhao Yang Liu Heng Zhang Min Sun Yan Wang Shanghong Zeng | 2023 | Journal of Energy Chemistry2023，，7： | 0 |
| 14 | Multi-peak spectrum of KML Ti:sapphire pulse显示文摘The multi-peak spectrum of Ti: sapphire pulses observed experimentally under ultra-broad bandwidth conditions ( < 15 fs pulse length) has been explained theoretically. It is shown that the self-phase-modulation effect is equivalent to the process of degenerate four-wave frequency-mixing. Based on this theoretical underpinning, the presence or absence of a multipeak spectrum provides a practical measure of whether the intracavity group-velocity-dispersion is ideally compensated for or not. | Shanghong Zhao Yishan Wang Guofu Chen Xianhua Wang Xun Hou | 1999 | Chinese Science Bulletin1999，44，8： | 0 |
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