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orbital angular momentum multiplexing communication system over atmospheric turbulence with K-best detection

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Science China(Information Sciences) 2021年第9期64卷 175-186页

作者： Yingmeng GE Liang WU Chuan ZHANG Zaichen ZHANG Laboratory of Efficient Architectures for Digital-communication and Signal-processing (LEADS) Southeast University National Mobile Communications Research Laboratory Southeast University Purple Mountain Laboratories

As the optical communication technology advances, vortex beam with orbital angular momentum(OAM) has gained wide attention due to its potential to significantly increase the channel capacity. Under the influence of atmospheric turbulence, there are still challenging problems in the OAM multiplexing system. To the best of our knowledge, in this paper one multiple-input-multiple-output(MIMO) detection technology named K-best detection, is first applied to the OAM multiplexing system. Numerical simulation results indicate the proposed solution enhances the performance of the optical communication system compared with data-aided least mean square(DA-LMS) and minimum mean squared error(MMSE) detection. Furthermore,with MMSE sorted QR decomposition(MMSE-SQRD) preprocessing, the performance of K-best detection can be further improved. When Cn~2= 1×10.14, about 4.4 dB signal-to-noise ratio(SNR) gain can be obtained by preprocessing at k = 2 while the complexity is not significantly increased. Computational complexity is also analyzed in this paper, results show that K-best detection with winner path extension(WPE) algorithm can achieve 43% system complexity reduction, achieving a compromise between performance and complexity in K-best detection.

关键词： orbital angular momentum atmospheric turbulence K-best detection MMSE-SQRD preprocessing WPE algorithm

orbital angular momentum photonic quantum interface

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Light(Science & Applications) 2016年第1期5卷 723-729页

作者： Zhi-Yuan Zhou Yan Li Dong-Sheng Ding Wei Zhang Shuai Shi Bao-Sen Shi Guang-Can Guo Key Laboratory of Quantum Information University of Science and Technology of ChinaHefeiAnhui 230026China Synergetic Innovation Center of Quantum Information&Quantum Physics University of Science and Technology of ChinaHefeiAnhui 230026China

Light-carrying orbital angular momentum(OAM)has great potential in enhancing the information channel capacity in both classical and quantum optical *** distance optical communication requires the wavelengths of light are situated in the low-loss communication windows,but most quantum memories currently being developed for use in a quantum repeater work at different wavelengths,so a quantum interface to bridge the wavelength gap is *** far,such an interface for OAM-carried light has not been realized ***,we report the first experimental realization of a quantum interface for a heralded single photon carrying OAM using a nonlinear crystal in an optical *** spatial structures of input and output photons exhibit strong *** importantly,single-photon coherence is preserved during up-conversion as demonstrated.

关键词： frequency conversion spontaneous parametric down conversion sum frequency generation orbital angular momentum

Diffraction deep neural network based orbital angular momentum mode recognition scheme in oceanic turbulence

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Chinese Physics B 2023年第4期32卷 364-369页

作者：詹海潮陈兵彭怡翔王乐王文鼐赵生妹 Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications(NUPT)Nanjing 210003China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology(Ministry of Education) Nanjing University of Posts and TelecommunicationsNanjing 210003China

orbital angular momentum(OAM)has the characteristics of mutual orthogonality between modes,and has been applied to underwater wireless optical communication(UWOC)systems to increase the channel *** this work,we propose a diffractive deep neural network(DDNN)based OAM mode recognition scheme,where the DDNN is trained to capture the features of the intensity distribution of the OAM modes and output the corresponding azimuthal indices and radial *** results show that the proposed scheme can recognize the azimuthal indices and radial indices of the OAM modes accurately and *** addition,the proposed scheme can resist weak oceanic turbulence(OT),and exhibit excellent ability to recognize OAM modes in a strong OT *** DDNN-based OAM mode recognition scheme has potential applications in UWOC systems.

关键词： orbital angular momentum diffractive deep neural network mode recognition oceanic turbulence

Design of cylindrical conformal transmitted metasurface for orbital angular momentum vortex wave generation

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Chinese Physics B 2022年第4期31卷 234-238页

作者：付犇余世星寇娜丁召张正平 Key Laboratory of Micro-Nano-Electronics and Software Technology of Guizhou Province College of Big Data and Information EngineeringGuizhou UniversityGuiyang 550025China

We propose a cylindrical conformal transmitted metasurface for orbital angular momentum vortex wave *** for calculating the phase distributions of cylindrical conformal transmitted metasurface is presented.A prototype of the proposed conformal transmitted metasurface is designed,fabricated and *** results shows that the proposed conformal transmitted metasurface can effectively generate vortex waves,which verifies the effectiveness of our *** proposed method may pave the way of vortex wave generation with cylindrical conformal devices.

关键词： orbital angular momentum cylindrical conformal transmitted metasurface

Asymmetrical spiral spectra and orbital angular momentum density of non-uniformly polarized vortex beams in uniaxial crystals

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Chinese Physics B 2023年第2期32卷 323-331页

作者：舒凌云程科廖赛梁梦婷杨嶒浩 College of Optoelectronic Technology Chengdu University of Information TechnologyChengdu 610225China

To explore the effect of non-uniform polarization on orbital angular momentum(OAM) in anisotropic medium, in this work investigated are the evolution of the spiral spectra and OAM densities of non-uniformly polarized vortex(NUPV)beams in uniaxial crystals propagating orthogonal to the optical axis, and also the case of uniformly polarized vortex(UPV)beams with left-handed elliptical polarization. In the input plane, the NUPV beams present their spiral spectra of m-mode concentrated at m = l ± 1 modes rather than m = l mode, and reveal the relation among topological charge l, mode of spiral spectra m and the power weight value Rmexpressed by l=∑^(∞)_(m)=-∞Rm. is still satisfied for UPV beams in uniaxially anisotropic crystals, whereas for NUPV beams their relations are no longer valid owing to non-uniform polarization. Furthermore, the analysis indicates that the asymmetrical distribution of power weight of spiral spectra and the non-zero value in the sum of longitudinal OAM densities originate from the initial non-uniform polarization and anisotropy in uniaxial crystals rather than topological charges. In addition, the relation between spiral spectrum and longitudinal OAM density is numerically discussed. This work may provide an avenue for OAM-based communications,optical metrology, and imaging by varying the initial non-uniform polarization.

关键词： non-uniformly polarized beams spiral spectrum spin angular momentum orbital angular momentum vortex

Free-space measurement-device-independent quantum-key-distribution protocol using decoy states with orbital angular momentum

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Chinese Physics B 2015年第12期24卷 238-245页

作者：王乐赵生妹巩龙延程维文 Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Information Physics Research Center and Department of Applied Physics Nanjing University of Posts and Telecommunications

In this paper, we propose a measurement-device-independent quantum-key-distribution（MDI-QKD） protocol using orbital angular momentum（OAM） in free space links, named the OAM-MDI-QKD protocol. In the proposed protocol,the OAM states of photons, instead of polarization states, are used as the information carriers to avoid the reference frame alignment, the decoy-state is adopted to overcome the security loophole caused by the weak coherent pulse source, and the high efficient OAM-sorter is adopted as the measurement tool for Charlie to obtain the output OAM state. Here, Charlie may be an untrusted third party. The results show that the authorized users, Alice and Bob, could distill a secret key with Charlie＇s successful measurements, and the key generation performance is slightly better than that of the polarization-based MDI-QKD protocol in the two-dimensional OAM cases. Simultaneously, Alice and Bob can reduce the number of flipping the bits in the secure key distillation. It is indicated that a higher key generation rate performance could be obtained by a high dimensional OAM-MDI-QKD protocol because of the unlimited degree of freedom on OAM states. Moreover,the results show that the key generation rate and the transmission distance will decrease as the growth of the strength of atmospheric turbulence（AT） and the link attenuation. In addition, the decoy states used in the proposed protocol can get a considerable good performance without the need for an ideal source.

关键词： measurement-device-independent quantum key distribution orbital angular momentum atmospheric turbulence decoy states

Geometric transformations of optical orbital angular momentum spatial modes

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Science China(Physics,Mechanics & Astronomy) 2018年第2期61卷 35-40页

作者： Rui He Xin An College of Electrical and Photoelectronic Engineering West Anhui University Reseach Center of Atmos Molecules and Optical Applications West Anhui University Institute of Quantum Control and Automation West Anhui University School of Computer and Information Hefei University of Technology

orbital angular momentum;;entangled state representation;;Laguerre-Gaussian

关键词： orbital angular momentum entangled state representation Laguerre-Gaussian mode

Reconstitution of optical orbital angular momentum through strongly scattering media via feedback-based wavefront shaping method

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Chinese Optics Letters 2021年第10期19卷 1-6页

作者：李兰婷郑远林刘海港陈险峰 State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China Jinan Institute of Quantum Technology Jinan 250101China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

orbital angular momentum(OAM)is a fundamental physical characteristic to describe laser fields with a spiral phase *** beams carrying OAMs have attracted more and more attention in recent ***,the wavefront of OAM light would be destroyed when it passes through scattering ***,based on the feedback-based wavefront shaping method,we reconstitute OAM wavefronts behind strongly scattering *** intensity of light with desired OAM states is enhanced to 150 *** study provides a method to manipulate OAMs of scattered light and is of great significance for OAM optical communication and imaging to overcome complex environment interference.

关键词： orbital angular momentum scattering wavefront shaping

Integrated photonic orbital angular momentum devices and systems:Potentials and challenges

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Science China Technological Sciences 2013年第3期56卷 579-585页

作者： CAI XinLun CHEN YuJie YU SiYuan Photonics Group and Institute of Quantum Information University of BristolBristolBS 8 1TRUnited Kingdom State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and EngineeringSun Yat-sen University

Emerging applications based on optical beams carrying orbital angular momentum will likely require photonic integrated devices and circuits for miniaturization,improved performance and enhanced *** paper reviews the state-of-the-art in the field of orbital angular momentum of light,reports recent developments in silicon integrated orbital angular momentum emitters,and discusses the applications potentials and challenges in applying orbital angular momentum of light in optical communications,quantum information systems,and optical sensing,imaging,and manipulation systems.

关键词： orbital angular momentum optical vortex optical communications quantum optics optical tweezers photonic integration