Results 81 to 90 of about 10,845 (304)

Super‐Resolution and High‐Data‐Density Acoustic Meta‐Hologram via Amplitude and Phase Coupling

Advanced Science, EarlyView.
A super‐resolution acoustic meta‐hologram utilizes amplitude‐phase coupling under energy conservation constraints to overcome the traditional diffraction limit. This conceptually advanced approach achieves high‐fidelity acoustic field reconstruction and dense information transmission, unlocking new potentials for high‐resolution acoustic imaging and ...
Xiao Guo, Xinzong Wang, Guoshen Tang, Haohan Zeng, Siqi Fan, Xinghao Hu, Youyu Mo, Zhenyu He, Tingting Li, Hui Xu, Jiao Shen, Haiyan Fan, Xiaoxiang Gao, Yifan Zhu, Hui Zhang, Badreddine Assouar   +15 more
wiley   +1 more source

Investigation of turbulence effect on the free space optical link for ground-to-train communications

, 2011
There is a growing demand for high mobility and ultrafast internet/data services which drives the motivation for free space optical (FSO) communications for high speed trains.
Ghassemlooy, Zabih, Paudel, Rupak, Livingstone, Bryan, Rajbhandari, Sujan, Le Minh, Hoa   +4 more
core  

Coherent Modulation for Free-Space Optical Communications: Impact of Turbulence and Link Optimization

The performance of coherent free-space optical (FSO) communications systems is degraded by the adverse effects of atmospheric turbulence. We review the impact of atmospheric turbulence on coherent FSO through simulation and experiment, as well as discuss
Gladysz, Szymon, McDonald, Douglas, Bellossi, Raphael   +2 more
core   +1 more source

Integrated demultiplexing and amplification of coherent optical combs [PDF]

, 2019
The explosive growth of the internet during the last few decades has been enabled by two complementary innovations in optical communications: the use of multiple optical channels within a single optical fibre, and the increase in the bandwidth of ...
Corbett, Brian M., O'Callaghan, James, Roycroft, Brendan, Peters, Frank H., Yang, Hua, O\u27Callaghan, James, Cotter, William E., Morrissey, Padraic. E.   +7 more
core   +1 more source

Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems

Advanced Electronic Materials, EarlyView.
Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang, Weipeng Wang, Xuan Cong, Shiyu Wang, Gao Li, Sen Gong, Lin Huang, Hongxin Zeng, Yaxin Zhang, Ziqiang Yang   +9 more
wiley   +1 more source

Experimental verification of the limits of optical channel intensity reciprocity

, 2012
Optical data links through the atmosphere suffer from turbulence-induced signal scintillation. In a coaxially-symmetric bidirectional link scenario, the variations of the axial intensities at both ends are correlated.
Cowley, William, Perlot, Nicolas, Grant, Ken, Giggenbach, D., Giggenbach, Dirk, Perlot, N., Cowley, W.G., Grant, K.   +7 more
core   +1 more source

Integratable optical comb source for coherent communications systems [PDF]

, 2017
A coherent optical comb source is monolithically integrated.
Morrissey, Padraic E., Kelly, Niall P., Dernaika, Mohamad, L. Caro, Alexander, Justin K., Caro, Ludovic, Peters, Frank H., F. H. Peters, J. K. Alexander, M. Dernaika, N. P. Kelly, P. E. Morrissey   +11 more
core   +1 more source

Phase-coherent lightwave communications with frequency combs [PDF]

, 2020
Fiber-optical networks are a crucial telecommunication infrastructure in society. Wavelength division multiplexing allows for transmitting parallel data streams over the fiber bandwidth, and coherent detection enables the use of sophisticated modulation ...
Lundberg, Lars, Foo, Benjamin, Karlsson, Magnus, Mazur, Mikael, Torres Company, Victor,, Schr\uf6der, Jochen, Mirani, Ali,, Mirani, Ali, Andrekson, Peter, Karlsson, Magnus,, Foo, Benjamin,, Schröder, Jochen,, Torres Company, Victor, Mazur, Mikael,, Lundberg, Lars,, Andrekson, Peter,   +15 more
core   +1 more source

Functional-Link Neural Network for Nonlinear Equalizer in Coherent Optical Fiber Communications

IEEE Access, 2019
We propose and experimentally demonstrate a simple nonlinear equalizer based on functional-link neural network (FLNN). The nonlinear stochastic mapping enables FLNN to serve as a nonlinear network, so we construct an FLNN with the signals from the two ...
Jing Zhang, Pingping Lei, Shaohua Hu, Mingyue Zhu, Zhenming Yu, Bo Xu, Kun Qiu   +6 more
doaj   +1 more source

Fundamental Challenges, Physical Implementations, and Integration Strategies for Ising Machines in Large‐Scale Optimization Tasks

Advanced Electronic Materials, EarlyView.
Ising machines are emerging as specialized hardware solvers for computationally hard optimization problems. This review examines five major platforms—digital CMOS, analog CMOS, emerging devices, coherent optics, and quantum systems—highlighting physics‐rooted advantages and shared bottlenecks in scalability and connectivity.
Hyunjun Lee, Joon Pyo Kim, Sanghyeon Kim
wiley   +1 more source