Results 11 to 20 of about 246,836 (290)
Survey on Free Space Optical Communication: A Communication Theory Perspective
IEEE Communications Surveys & Tutorials, 2014 Optical wireless communication (OWC) refers to transmission in unguided propagation media through the use of optical carriers, i.e., visible, infrared (IR), and ultraviolet (UV) bands. In this survey, we focus on outdoor terrestrial OWC links which operate in near IR band.
Khalighi, Mohammad Ali, Uysal, Murat
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Scientific Reports, 2021 Recently, new physics for unconditional security in a classical key distribution (USCKD) has been proposed and demonstrated in a frame of a double Mach–Zehnder interferometer (MZI) as a proof of principle, where the unconditional security is rooted in ...
Byoung S. Ham
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Relay-assisted free-space optical communication [PDF]
IEEE Transactions on Wireless Communications, 2007 In this paper, we present relay-assisted transmission as a powerful fading mitigation tool for free-space optical systems operating in atmospheric turbulence channels. We study both serial (i.e., multi-hop transmission) and parallel (i.e., cooperative diversity) relaying encoupled with amplify-and-forward and decode-and-forward modes.
Majid Safari, Murat Uysal
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Point-to-point stabilized optical frequency transfer with active optics
Nature Communications, 2021 Atomic clocks and their networks are useful tools for optical communications and frequency metrology. Here the authors use phase stabilization and active tip-tilt to suppress atmospheric effects and enable optical frequency transfer through free-space.
Benjamin P. Dix-Matthews +10 more
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RESTORE: Low-Energy Drone-Assisted NLoS-FSO Emergency Communications
IEEE Access, 2022 Drones are becoming an alternative for the rapid but temporary deployment of data-communication infrastructure in disaster-struck areas. A drone may be equipped with communications equipment to provide network connectivity for stranded users and first ...
Paa Kwesi Esubonteng +1 more
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A Review of Semiconductor-Based Monolithic Optical Phased Array Architectures
IEEE Open Journal of the Solid-State Circuits Society, 2021 Semiconductor-based monolithic optical phased arrays (OPA) enable optical beam-steering for lidar and 3D imaging, free-space optical communications, projection and 3D holographical displays, and neural probes among many other possible applications.
Hossein Hashemi
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Free Space Optical Communication Systems [PDF]
, 2009 The main advantage of using optical frequencies in free-space communication systems is the high directivity of the propagating optical beam. (In the context of this chapter, the term “free space” refers to unguided optical communications; exoatmospheric environments are referred to as “space.”) When transmitted from an antenna, electromagnetic waves ...
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Free-Space Optical MISO Communications With an Array of Detectors
IEEE Open Journal of the Communications Society, 2020 Multiple-input multiple-output (MIMO) and multiple-input single-output (MISO) schemes have yielded promising results in free space optical (FSO) communications by providing diversity against fading of the received signal intensity.
Muhammad Salman Bashir +1 more
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Physical-Layer Security in Free-Space Optical Communications
IEEE Photonics Journal, 2015 The communication between two legitimate peers in the presence of an external eavesdropper is studied from a physical-layer security perspective in the context of free-space optical (FSO) communications.
F. Javier Lopez-Martinez +2 more
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Sensors, 2023 Free-space optical (FSO) communication has been studied for next-generation network systems. Because an FSO system establishes point-to-point communication links, maintaining alignment among the transceivers is a critical challenge.
Hye-Min Park +2 more
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