Results 21 to 30 of about 19,076 (262)
Photonics, 2022 Ultraviolet (UV) communication is considered an effective complement to traditional wireless communication. However, the scattering models of existing non-line-of-sight (NLOS) UV, which are complex, are difficult to combine with the test.
Axin Du +5 more
doaj +1 more source
Free-space optical delay line using space-time wave packets
Nature Communications, 2020 Delay lines are a critical part of future optical communications. Here, the authors create a delay line in free space by tuning the group velocities of multiple inline space-time wavepackets to introduce different delays.
Murat Yessenov +3 more
doaj +1 more source
Modelling Investigation of Atmospheric Turbulence-Induced Beam Deviation for LEO/GEO FSO Communication Link [PDF]
EPJ Web of ConferencesThe uplink analytical simulation scenario of atmospheric turbulence-induced beam deviation can give the insight needed to understand and create the mitigation techniques that could support novel applications in the fields of free-space optical ...
Al-Juboori Haider
doaj +1 more source
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
Prospects and Challenges of Free Space Optical Communications
, 2018 Free space optical (FSO) transmission is a technology which uses a narrow laser beam to transmit the signal from the source to the destination through the free space. Although it has various advantages, a laser beam propagating through the atmosphere is subjected to different kind of disturbances causing the attenuation of the signal and, in some ...
Abir Touati +4 more
openaire +2 more sources
IEEE Photonics Journal, 2018 When an eavesdropper performs an optical beam-splitting attack in a free-space optical communications channel, it is referred to as an optical wiretap channel, which is an extension of Wyner's wiretap channel model.
Tyan-Lin Wang, Ivan B. Djordjevic
doaj +1 more source
An optically powered, free space optical communications receiver
2008 IEEE International Symposium on Circuits and Systems (ISCAS), 2008 Two of the key components of sensor motes are a power source and a communications receiver. One approach to creating very small motes is to use free space optical communication and to scavenge power from the optical downlink. In this paper photodiodes are described that were made on a standard CMOS process and generate electrical power from the ...
Liu, J +4 more
openaire +2 more sources
Applied Physics ExpressWe report a coherent laser transmitter for free space optical communications based on multiwavelength coherent beam combining. We performed 5.6 Gbps free-space optical communications using a two-element optical phased array with three wavelengths ...
Eisuke Haraguchi +6 more
doaj +1 more source
Frontiers in Physics, 2022 Being able to dynamically control the transmitted-beam divergence can bring important advantages in free-space optical communications. Specifically, this technique can help to optimize the overall communications performance when the optimum laser-beam ...
Alberto Carrasco-Casado +11 more
doaj +1 more source
Advanced Engineering Materials, EarlyView.During creep of a single‐crystal Ni‐based superalloy, the overall crystal orientation is observed to remain constant while the microstructure evolves. Despite the lack of macroscopic rotation, small (<1°) rotations are observed on the submicron size scale and are accommodated by counteracting rotations over the scale of several micrometers.
E. J. Payton +3 more
wiley +1 more source