Results 101 to 110 of about 10,131,834 (310)

Evaluation of the Scintillation Loss for Optical Communication Systems with Direct Detection [PDF]

, 2006
In optical communications through the atmosphere, the evaluation of a link feasibility often requires the quantification of the scintillation penalty in terms of power loss. To find how much additional optical power is needed to reach the bit-error-rate (
Perlot, Nicolas
core  

FSO Detection using differential signaling in outdoor correlated-channels condition [PDF]

, 2016
In this letter, we introduce a detection technique based on differential signaling scheme for outdoor free space optical communications. This method requires no channel state information (CSI) and does not suffer from the computational load compared with
Ghassemlooy, Zabih, Bhatnagar, Manav R., Zvanovec, Stanislav, Bhatnagar, Manav, Khalighi, Mohammad-Ali, Khalighi, Mohammad Ali, Mansour Abadi, Mojtaba   +6 more
core   +1 more source

On‐Chip Photonic Neural Network Architectures

Advanced Optical Materials, EarlyView.
This review presents a comprehensive overview of on‐chip photonic neural network architectures, covering key photonic building blocks, representative network types, and emerging applications. Recent advances, implementation challenges, and future directions are examined, highlighting the potential of integrated photonics to enable ultrafast, energy ...
Seokjin Hong, Berkay Neseli, Seungyeon Cho, Seungsoo Lee, Yeonjun Kim, Seungyoon Choi, Hyo‐Hoon Park, Hamza Kurt   +7 more
wiley   +1 more source

Compact optical transmitters for CubeSat free-space optical communications [PDF]

, 2018
We present the results of an architectural trade study and prototype implementation of an optical transmitter suitable for resource-constrained CubeSats.
Cahoy, Kerri, Caplan, David O., Kingsbury, Ryan W   +2 more
core   +1 more source

Revealing Mechanofluorochromism and Intricate Long‐lived Decay Pathways in Keto‐Coumarin‐Based Molecular Crystals

Advanced Optical Materials, EarlyView.
Donor–acceptor organic emissive materials show great promise in cutting‐edge optical applications. Herein, the photophysical properties of two keto‐coumarin organic materials are studied in detail. Both show mechanofluorochromism, but a diphenylamine donor derivative exhibits intricate decay pathways in the crystal form, including decays ranging from ...
Peter W. McDonald, Subhadeep Das, Arnab Mandal, Gilles Clavier, Clémence Allain, Abhijit Patra, Rémi Métivier   +6 more
wiley   +1 more source

On the Performance of Coherent OFDM Systems in Free-Space Optical Communications

IEEE Photonics Journal, 2015
This paper presents a new model of a coherent orthogonal frequency division multiplexing free space optical communication (OFDM-FSO) system that can be tuned with the virtual local oscillator, under the Gamma-Gamma atmospheric turbulence channel, not ...
Yi Wang, Deli Wang, Jing Ma
doaj   +1 more source

Free-space optical communication employing subcarrier modulation and spatial diversity in atmospheric turbulence channel [PDF]

, 2008
An expression for the bit error rate of a multiple subcarrier intensity-modulated atmospheric optical communication system employing spatial diversity is derived. Spatial diversity is used to mitigate scintillation caused by atmospheric turbulence, which
Ghassemlooy, Zabih, Popoola, Wasiu Oyewole, Allen, John, Popoola, W, Popoola, Wasiu O., Leitgeb, Erich, Gao, S, Gao, Steven, Allen, Joe, Ghassemlooy , Zabih   +9 more
core   +1 more source

A Layered Two‐Dimensional Hydrogen‐Bonded Organic Framework Based on 2,5,8,11‐Tetrakis(4‐Carboxyphenyl)Perylene Diimide: Structural Nature, Optical and Photophysical Properties

Advanced Optical Materials, EarlyView.
A novel hydrogen‐bonded organic framework (HOF) based on perylene diimide (PDI) is synthesized, structurally and spectroscopically characterized. Its photophysical behavior highlights how supramolecular organizations govern the optical properties, including emission from monomers, aggregates, and excimer‐like species. Structural transformations induced
Mario de la Hoz Tomás, Taito Hashimoto, Boiko Cohen, Yuzuki Murata, Kazuki Shiga, Ryota Hanyu, Ryusei Oketani, Norimitsu Tohnai, Ichiro Hisaki, Abderrazzak Douhal   +9 more
wiley   +1 more source

Turbulence-resistant high speed free-space optical communications using MUTC photodiodes

Results in Optics
In free-space optical (FSO) communication systems, atmospheric turbulence induces scintillation of received optical power. Higher transmission optical power can compensate turbulence-induced scintillation and other channel attenuation.
Beibei Cui, Shanyong Cai, Liqian Wang, Zhiguo Zhang   +3 more
doaj   +1 more source

All-optical retro-modulation for free-space optical communication

Optics Express, 2018
This work presents device and system architectures for free-space optical and optical wireless communication at high data rates over multidirectional links. This is particularly important for all-optical networks, with high data rates, low latencies, and network protocol transparency, and for asymmetrical networks, with multidirectional links from one ...
Brandon, Born, Ilija R, Hristovski, Simon, Geoffroy-Gagnon, Jonathan F, Holzman   +3 more
openaire   +2 more sources