Results 1 to 10 of about 19,076 (262)

Orbital angular momentum and beyond in free-space optical communications [PDF]

Nanophotonics, 2021
Orbital angular momentum (OAM), which describes tailoring the spatial physical dimension of light waves into a helical phase structure, has given rise to many applications in optical manipulation, microscopy, imaging, metrology, sensing, quantum science,
Wang Jian, Liu Jun, Li Shuhui, Zhao Yifan, Du Jing, Zhu Long   +5 more
doaj   +2 more sources

Bidirectional wavelength-division-multiplexing fibre-free-space optical communications using polarisation multiplexing technique and tunable optical vestigial sideband filter [PDF]

Communications Engineering
To address the growing demand from emerging applications, high transmission capacity is essential for both fibre backbones and last-mile communications.
Hsiao-Mei Lin, Chia-Peng Wang, Hai-Han Lu, Stotaw Talbachew Hayle, Xu-Hong Huang, Wei-Wen Hsu, Yu-Chen Chung, Yu-Yao Bai, Kelper Okram, Jia-Ming Lu   +9 more
doaj   +2 more sources

Structuring light with flows [PDF]

Nature Communications
Structured light has profoundly advanced optical manipulation, processing and imaging. However, its practical deployment in free space is limited by the constrained solutions of Helmholtz equation, which are bound to fixed propagation laws.
Wenxiang Yan, Zheng Yuan, Yuan Gao, Zhaozhong Chen, Zhi-Cheng Ren, Xi-Lin Wang, Jianping Ding, Hui-Tian Wang   +7 more
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High-performance 100 Gbps free-space optical communication via optical pin beam receiver [PDF]

Communications Engineering
Free-space optical communication with high transmission bandwidth and small antenna size has been progressively deployed for ground-air-space communications in recent years.
Meiling Guan, Yang Liu, Huahua Wang, Hongyue Xiao, Hongpeng Lu, Hongman Zhang, Hongwei Jiang, Chengming Sun, Huijian Liang, Changzhi Xu, Lu Gao, Haiping Mei, Yan Li, Jian Wu, Zhigang Chen, Ze Zhang   +15 more
doaj   +2 more sources

An Introduction to Free-space Optical Communications

Radioengineering, 2010
Over the last two decades free-space optical communication (FSO) has become more and more interesting as an adjunct or alternative to radio frequency communication.
H. Henniger, O. Wilfert
doaj   +3 more sources

LDPC Decoding Techniques for Free-Space Optical Communications

IEEE Access, 2021
There has been significant interest in free-space optical (FSO) communication by the research community in recent years. This is due to its high data rate, unlicensed spectrum, low cost, and immense security for FSO systems.
Albashir Adel Youssef, Mohamed Abaza, Ayshah S. Alatawi   +2 more
doaj   +1 more source

Ground-to-Drone Optical Pulse Position Modulation Demonstration as a Testbed for Lunar Communications

Drones, 2023
Free-space optical (FSO) communication promises to bring fibre-like speeds to data transmissions between ground, sky and space. This is becoming more important in light of the increasing volume of data collected by aircraft and spacecraft. The University
Skevos F. E. Karpathakis, Benjamin P. Dix-Matthews, Shane M. Walsh, Ayden S. McCann, David R. Gozzard, Alex M. Frost, Charles T. Gravestock, Sascha W. Schediwy   +7 more
doaj   +1 more source

Deep learning for enhanced free-space optical communications

Machine Learning: Science and Technology, 2023
Atmospheric effects, such as turbulence and background thermal noise, inhibit the propagation of light used in ON–OFF keying (OOK) free-space optical (FSO) communication. Here we present and experimentally validate a convolutional neural network (CNN) to
M P Bart, N J Savino, P Regmi, L Cohen, H Safavi, H C Shaw, S Lohani, T A Searles, B T Kirby, H Lee, R T Glasser   +10 more
doaj   +1 more source

Relay-assisted free-space optical communication [PDF]

IEEE Transactions on Wireless Communications, 2007
In this paper, we present relay-assisted transmission as a powerful fading mitigation tool for free-space optical systems operating in atmospheric turbulence channels. We study both serial (i.e., multi-hop transmission) and parallel (i.e., cooperative diversity) relaying encoupled with amplify-and-forward and decode-and-forward modes.
Majid Safari, Murat Uysal
openaire   +1 more source

Analysis of phase noise effects in a coupled Mach–Zehnder interferometer for a much stabilized free-space optical link

Scientific Reports, 2021
Recently, new physics for unconditional security in a classical key distribution (USCKD) has been proposed and demonstrated in a frame of a double Mach–Zehnder interferometer (MZI) as a proof of principle, where the unconditional security is rooted in ...
Byoung S. Ham
doaj   +1 more source