Article
Optics
Xiaohui Wang, Yang Wang, Shuai Mao, Yongze Yu, Haoyu Gu, Dongdong Deng, Yingxiong Song, Fufei Pang, Liyun Zhuang, Song Yang, Xiaofeng He, Dandan Wei, Yudong Yang
Summary: To address the upcoming famine of channel capacity, optical orbital angular momentum (OAM) has been proposed for space-division multiplexing (SDM). However, atmospheric turbulence (AT) severely impacts the performance of OAM-based free-space optical communication (FSOC) due to crosstalk induced by distorted helical phase. A synthesizing-crosstalk method is proposed to mitigate AT by using an OAM-probe beam (OPB) that has the same mode as the propagated OAM-data beam (ODB). Experimental results show that the proposed scheme improves the bit error rate (BER) and constellation plot (CP) of the OAM channels under different AT conditions, making it feasible for future OAM-based FSOC.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Pauline Boucher, Hugo Defienne, Sylvain Gigan
Summary: This study demonstrates tunable control of spatial correlations between photon pairs in order to engineer the properties of quantum optical states, measured using an EMCCD camera. By shaping the spatial pump beam profile, the spatial structure of entangled photon pairs in high dimensions was tailored without affecting intensity, holding potential for quantum technologies based on high-dimensional spatial entanglement.
Article
Engineering, Marine
Donghui Yang, Zhou Yu, Zhengda Hu, Wenhai Wang, Yun Zhu
Summary: This study theoretically investigates the orbital angular momentum (OAM) carried by bi-photon entangled Airy beams in unstable oceanic turbulence. The results show a significant enhancement in the relative detection probability of OAM carried by bi-photon entangled Airy beams compared to single photon systems, with some beams being less affected by turbulence.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Optics
Hengfei Zhang, Jinpeng Yuan, Shichao Dong, Chaohua Wu, Lirong Wang, Liantuan Xiao, Suotang Jia
Summary: The study introduces a novel all-optical tunable multi-port high-order Gaussian beam splitter, which increases channel capacity and improves processing speed. An experiment shows a distinguishable five-port output beam, beneficial for high-speed optical communications. By tuning the optical properties of the dielectric structure, the spatial position and intensity distribution of each output port can be precisely controlled.
Article
Physics, Multidisciplinary
Xiang Yan, Peng-Fei Zhang, Cheng-Yu Fan, Jing-Hui Zhang
Summary: This paper investigates the propagation of entangled orbital angular momentum (OAM) photons in a weakly turbulent atmosphere. It focuses on the influence of backward scattering on the evolution of OAM. The results show that backward scattering is important in the analysis of OAM entanglement evolution, especially for higher-order OAM modes. Moreover, entangled photon pairs composed of higher OAM modes are not more robust in turbulence within the weak scintillation regime when the OAM mode is greater than 4. These findings will be valuable for future studies on OAM-based optical wave propagation through turbulent atmospheres.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2022)
Article
Optics
Xiang Yan, Pengfei Zhang, Boying Wu, Jinghui Zhang
Summary: In this study, the decay of OAM entanglement in non-Kolmogorov turbulence was numerically evaluated. Results show that OAM entanglement with higher azimuthal mode and larger radial quantum number can survive longer distances in weak scintillation regime, with significant influences from beam and turbulence parameters. The turbulence effect on OAM entanglement is most severe around a generalized exponent of 3.07.
Article
Chemistry, Analytical
Haiyang Yu, Chunyi Chen, Xiaojuan Hu, Huamin Yang
Summary: In this study, an efficient deep learning framework based on a derived ELM is proposed for orbital angular momentum (OAM) recognition in atmospheric turbulence. The model, different from traditional neural network approaches, can automatically match different OAM modes and is suitable for time-varying atmospheric environments.
Article
Optics
Huicong Zhang, Tao Zhou, Chaoqing Dai
Summary: In this study, we report the experimental observation of the instability suppression of higher-order vortex solitons in cylindrical lead glass with thermal nonlocal nonlinearity. By using a coaxially propagating, mutually incoherent Gaussian beam, the vulnerable higher-order vortex soliton can be stabilized, forming a new type of soliton called Gauss-vortex vector soliton. The experimental results are in close agreement with the numerical simulations.
Article
Chemistry, Multidisciplinary
Da-Jie Yang, Ji-Cai Liu
Summary: In this study, efficient and selective high-order resonances were demonstrated in symmetric and asymmetric plasmonic nanoparticles using vortex beams. A pure high-order resonance was observed in symmetric nanoparticles configured with a complete nanoring lying on the focal center. Asymmetric nanoparticles configured with a complete ring off the beam center or a splitting nanoring showed multiple resonances influenced by the ring's geometry, position, orientation, and photon OAM. These findings contribute to the understanding and control of OAM-involved light-material interactions in asymmetric nanosystems.
Article
Optics
Donghui Wang, Chengcheng Feng, Lingzhi Meng, Hongye Wang, Libo Yuan
Summary: A mixed multi-order vortex beam generator based on a Reuleaux triangle core fiber chiral grating is proposed, with the simultaneous coupling of the core mode and 1st- and 3rd-order vortex modes. The phase matching conditions and a cladding shrinkage method for flexible wavelength adjustment are analyzed. This new approach offers potential applications in fiber OAM communications, optical tweezers, and super-resolution imaging.
Article
Optics
Yonglei LIu, Zhen Dong, Fei Wang, Yahong Chen, Yangjian Cai
Summary: We propose a protocol to synthesize a class of vector beam array in the far field with periodic higher-order Poincare sphere (HOPS) polarization states by engineering the second-order spatial coherence structure of a partially coherent light source. The polarization state of a single HOPS beam at the source plane can be mapped into a beam array in the far field by engineering the spatial coherence of the beam source to have a lattice-like distribution. The degree of polarization of the generated HOPS beam array can be conveniently controlled by modulating the transverse spatial coherence width of the source. Our method provides an additional way to construct the structured beam array and may find applications, e.g., in multiparticle manipulations.
Article
Multidisciplinary Sciences
Gaurav Nirala, Siva T. Pradyumna, Ashok Kumar, Alberto M. Marino
Summary: The ability to encode and transmit information using the temporal and spatial degrees of freedom of quantum states of light is crucial for an efficient quantum network. However, there is still a lack of control required to fully utilize the high dimensionality of the spatial degree of freedom. In this study, we encode information in the spatial correlations of entangled twin beams, taking advantage of their dependence on the angular spectrum of the pump for four-wave mixing. We demonstrate that the encoded information can only be extracted through joint spatial measurements of the twin beams, without modifying the temporal quantum correlations.
Article
Physics, Applied
Xue Guo, Zhe Meng, Jian Li, Jia-Zhi Yang, Mairikena Aili, An-Ning Zhang
Summary: This paper studies the interference phenomenon of vortex beams carrying orbital angular momentum (OAM) in a Mach-Zehnder interferometer using a stable and adjustable setup. Different initial states in the interferometer evolve and the interferograms change with the phase of the interferometer. The research not only helps to understand the special phenomenon of OAM in the interferometer but also provides theoretical and experimental support for OAM as a quantum information carrier.
APPLIED PHYSICS LETTERS
(2021)
Article
Optics
Yuhang Wu, Andong Wang, Long Zhu
Summary: This paper proposes a novel network architecture that integrates convolutional layers and residual structures to compensate for the adverse effects of atmospheric turbulence on OAM beam transmission. By harnessing the local feature learning capability of convolutional layers and the information-preserving function of residual structures, the proposed network can mitigate power fluctuations and reduce mode crosstalk. Experimental results show significant improvements in received optical power and reduction in mode crosstalk using the proposed network under varying turbulence conditions.
Article
Physics, Multidisciplinary
Zheng-Da Hu, Jicheng Wang, Yun Zhu, Mengmeng Li, Sergei Khakhomov, Igor Semchenko
Summary: We investigate the impact of non-Kolmogorov atmospheric turbulence on the Holevo channel capacity of a quantum communication scheme using the Hypergeometric Gaussian-II (HyGG-II) modes. By modulating the hollowness parameter, the HyGG-II modes exhibit higher capacity compared to the Laguerre-Gaussian modes. We explore the effects of low-order turbulence aberrations and find that tilt aberration dominates and defocus and astigmatism aberrations are negligible, while coma aberration becomes non-negligible under enhanced turbulence strength or channel zenith angle. Our results show that only total and tilt aberrations are sensitive to the non-Kolmogorov power-law exponent. This research has implications for quantum optical communication and aberration compensation in turbulent channels utilizing vortex beams.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2023)
Article
Optics
Yun Zhu, Licheng Zhang, Yixin Zhang
CHINESE OPTICS LETTERS
(2016)
Article
Optics
Yuqian Wu, Yixin Zhang, Yun Zhu
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2016)
Article
Optics
Yuqian Wu, Yixin Zhang, Yun Zhu, Zhengda Hu
Article
Optics
Yun Zhu, Yixin Zhang, Guofeng Yang
OPTICS COMMUNICATIONS
(2017)
Article
Optics
Qiu Wang, Yun Zhu, Yixin Zhang
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Optics
Ying Xu, Yun Zhu, Yixin Zhang
OPTICS COMMUNICATIONS
(2018)
Article
Optics
Ye Li, Yixin Zhang, Yun Zhu
OPTICS COMMUNICATIONS
(2018)
Article
Optics
Beibei Hu, Yixin Zhang, Yun Zhu
Article
Optics
Ye Li, Yixin Zhang, Yun Zhu
Article
Optics
Ye Li, Yixin Zhang, Yun Zhu, Lin Yu
Article
Physics, Applied
Mei-Song Wei, Yun Zhu, Jicheng Wang, Yixin Zhang, Zheng-Da Hu
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2019)
Article
Optics
Ye Li, Yixin Zhang, Yun Zhu
OPTICS COMMUNICATIONS
(2019)
Article
Materials Science, Multidisciplinary
Qiyong Liang, Yun Zhu, Yixin Zhang
RESULTS IN PHYSICS
(2019)
Article
Engineering, Marine
Shuang Zhai, Yun Zhu, Yixin Zhang, Zhengda Hu
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2020)
Article
Engineering, Marine
Shibao Deng, Yun Zhu, Yixin Zhang
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2019)
