Results 31 to 40 of about 313,418 (192)
Fading testbed for free-space optical communications [PDF]
SPIE Proceedings, 2016 Free-space optical (FSO) communication is a very attractive technology offering very high throughput without spectral regulation constraints, yet allowing small antennas (telescopes) and tap-proof communication. However, the transmitted signal has to travel through the atmosphere where it gets influenced by atmospheric turbulence, causing scintillation
Amita Shrestha +5 more
openaire +2 more sources
High Speed Visible Light Communication Using Blue GaN Laser Diodes [PDF]
, 2016 GaN-based laser diodes have been developed over the last 20 years making them desirable for many security and defence applications, in particular, free space laser communications.
Czernecki, R. +15 more
core +2 more sources
Enhanced Neural Architecture for Real-Time Deep Learning Wavefront Sensing
SensorsTo achieve real-time deep learning wavefront sensing (DLWFS) of dynamic random wavefront distortions induced by atmospheric turbulence, this study proposes an enhanced wavefront sensing neural network (WFSNet) based on convolutional neural networks (CNN).
Jianyi Li +4 more
doaj +1 more source
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 +7 more
doaj +1 more source
Quantum Relay-Assisted Free-Space Optical Communication
IEEE Photonics JournalRelay-based quantum communication utilizes intermediate nodes to extend the transmission distanceof quantum signals and mitigate the masking effect caused by obstacles or turbulence in free-space optical (FSO) channels.
Manav R. Bhatnagar +2 more
doaj +1 more source
Hybrid SPAD/PD Receiver for Reliable Free-Space Optical Communication
IEEE Open Journal of the Communications Society, 2020 Free-space optical (FSO) communication provides wireless optical connectivity with high data rates and low-cost implementation; however, its performance is strongly influenced by the power attenuation due to the infrequent adverse weather conditions ...
Shenjie Huang, Majid Safari
doaj +1 more source
Free-Space Quantum Key Distribution
, 2016 Based on the firm laws of physics rather than unproven foundations of mathematical complexity, quantum cryptography provides a radically different solution for encryption and promises unconditional security.
Carrasco-Casado, Alberto +2 more
core +1 more source
RZ-DPSK Optical Modulation For free Space Optical Communication Satellites [PDF]
, 2017 We demonstrate up to 4 dB improvement in optical receiver sensitivity using Return-to-Zero Differential Phase Shift Keying (RZ-DPSK) modulation compared with Non-Return-to-Zero On Off Keying (NRZ-OOK) in free space optical communication from satellite to
Elayoubi, Karim +5 more
core +1 more source
MIMO free-space optical communication employing subcarrier intensity modulation in atmospheric turbulence channels [PDF]
, 2009 In this paper, we analyse the error performance of transmitter/receiver array free-space optical (FSO) communication system employing binary phase shift keying (BPSK) subcarrier intensity modulation (SIM) in clear but turbulent atmospheric channel ...
E. Leitgeb +12 more
core +1 more source
V-Shape Liquid Crystal-Based Retromodulator Air to Ground Optical Communications [PDF]
, 2008 This paper describes the use of a 2D liquid crystal retro-modulator as a free space, wireless, optical link. The retro-modulator is made up of a retro-reflecting cornercube onto which 2 cascaded V-shape smectics liquid crystal modulators are mounted. The
A. Carrasco +7 more
core +3 more sources