Results 101 to 110 of about 10,131,863 (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

Near‐Field Nanoimaging of Programmable Phase Transitions in Ga+‐Irradiated VO2

Advanced Optical Materials, EarlyView.
Focused Ga+ ion irradiation locally reprograms the insulator‐to‐metal transition in VO2 thin films. Infrared and terahertz near‐field nanoimaging reveals that low irradiation doses localize the resistive‐switching filament within the defect region, while high doses suppress switching there and redirect the filament into pristine VO2.
Sarabpreet Singh, Nareg Ghazikhanian, Muhammad Asjad, Erbin Qiu, Ivan K. Schuller, Yohannes Abate   +5 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

Facile, Scalable, and High‐Yield Synthesis of a Near‐Unity Quantum Yield Zero‐Dimensional Copper Halide Cs3Cu2Cl5 Scintillator for X‐Ray Imaging

Advanced Optical Materials, EarlyView.
A dioxolane‐mediated reaction synthesis provides a simple and scalable route to phase‐pure Cs3Cu2Cl5 scintillator powders with near‐complete conversion, near‐unity photoluminescence quantum yield, and long‐term stability. The resulting green‐emitting composite films exhibit strong radioluminescence, high light yield, and practical compatibility with ...
Young Seung Choi, Jaeyoung Im, Hyunjun Kim, Chaeyoun Kim, Min Kyu Kim, Kang Heo, Dooho Kim, SangHoon Kim, Hyunmin Yang, Jinu Lee, Sung Oh Cho, Bo Kyung Cha, Byungha Shin   +12 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

Dielectric Permittivity Tensor of Muscovite for Next Generation All Van Der Waals Broadband Photonic Components

Advanced Optical Materials, EarlyView.
Low‐index and low‐loss vdW muscovite represents an emerging robust dielectric platform for the creation of next‐generation all‐vdW nanophotonic architectures. Its utilization as a low‐index building‐block in all‐vdW multilayers enables extreme optical contrast when paired with MoS2, paving the way to the realization of few‐layer ultrathin DBS ...
Meri H. Hayrapetyan, Maksim L. Sargsyan, Davit A. Karakhanyan, Ani P. Khachatryan, Maria A. Levonyan, Dmitrii Litvinov, Maciej Koperski, Artsruni V. Margaryan, Makars Šiškins, Konstantin S. Novoselov, Davit A. Ghazaryan   +10 more
wiley   +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

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