Results 91 to 100 of about 3,957 (187)

Measurement of the Structure Constant of Refractivity at Optical Wavelengths Using a Scintillometer [PDF]

, 2012
The structure constant of the atmospheric refractive index is used for characterizing the turbulence strength and for predicting the scintillation of electromagnetic waves in atmosphere.
Grabner, M., Kvicera, V.
core   +1 more source

Performance of free space optical communication using M-array receivers at atmospheric conditions [PDF]

, 2009
: In free space optical (FSO) communication links, atmospheric parameters including absorption, scattering and turbulence have significant impacts on the quality of laser beams propagating through the atmosphere.
Ahmadi, Vahid, Chaman Motlagh, Abolfazl, Ghassemlooy, Zabih   +2 more
core   +1 more source

Performance of SIMO FSO Links over Mixture Composite Irradiance Channels

Applied Sciences, 2019
Free space optics (FSO) technology has demonstrated an increasingly scientific and commercial interest over the past few years. However, due to signal propagation in the atmosphere, the operation depends strongly on the atmospheric conditions and some ...
Nikolaos A. Androutsos, Hector E. Nistazakis, Argyris N. Stassinakis, Harilaos G. Sandalidis, George S. Tombras   +4 more
doaj   +1 more source

RIS-aided free-space optics communications in A2G networks over inverted Gamma–Gamma turbulent channels

ICT Express
Reconfigurable intelligent surfaces (RISs) have revolutionized free-space optics (FSO) communication by dynamically optimizing the propagation environment.
Md. Abdur Rakib, Md. Ibrahim, A.S.M. Badrudduza, Imran Shafique Ansari, Md. Shahid Uz Zaman, Heejung Yu   +5 more
doaj   +1 more source

Optical power allocation for adaptive transmissions in wavelength-division multiplexing free space optical networks

Digital Communications and Networks, 2015
Attracting increasing attention in recent years, the Free Space Optics (FSO) technology has been recognized as a cost-effective wireless access technology for multi-Gigabit rate wireless networks.
Hui Zhou, Shiwen Mao, Prathima Agrawal
doaj   +1 more source

Design and Security Analysis of Quantum Key Distribution Protocol Over Free-Space Optics Using Dual-Threshold Direct-Detection Receiver

IEEE Access, 2018
This paper proposes a novel design and analyzes security performance of quantum key distribution (QKD) protocol over free-space optics (FSO). Unlike conventional QKD protocols based on physical characteristics of quantum mechanics, the proposed QKD ...
Phuc V. Trinh, Thanh V. Pham, Ngoc T. Dang, Hung Viet Nguyen, Soon Xin Ng, Anh T. Pham   +5 more
doaj   +1 more source

Joint Divergence Angle of Free Space Optics (FSO) Link and UAV Trajectory Design in FSO-Based UAV-Enabled Wireless Power Transfer Relay Systems

Photonics
Free Space Optics (FSO)-based UAV-enabled wireless power transfer (WPT) relay systems have emerged as a key technology for 6G networks, efficiently providing continuous power to Internet of Things (IoT) devices even in remote areas such as disaster ...
Jinho Kang
doaj   +1 more source

Experimental Demonstration of OAF Fiber-FSO Relaying for 60 GBd Transmission in Urban Environment

Photonics
We present an experimental demonstration of a daylight-capable Optical Amplify-and-Forward (OAF) relaying system designed to support flexible and high-capacity network topologies.
Evrydiki Kyriazi, Panagiotis Toumasis, Panagiotis Kourelias, Argiris Ntanos, Aristeidis Stathis, Dimitris Apostolopoulos, Nikolaos Lyras, Hercules Avramopoulos, Giannis Giannoulis   +8 more
doaj   +1 more source

Duplex Baseband Signal Transmission Over Free Space Optical (FSO) Link Employing Carrier Reuse

, 2023
Abstract With increasing IoT and a plethora of multimedia applications being used, there is an ever-increasing demand for bandwidth-intensive applications coupled with cost-effectiveness. Communication networks employing optical fiber had been de facto standard for such communication systems.
openaire   +1 more source