High-Capacity Free-Space Optical Communications Between a Ground Transmitter and a Ground Receiver via a UAV Using Multiplexing of Multiple Orbital-Angular-Momentum Beams

Li, Long; Zhang, Runzhou; Zhao, Zhe; Xie, Guodong; Liao, Peicheng; Pang, Kai; Song, Haoqian; Liu, Cong; Ren, Yongxiong; Labroille, Guillaume; Jian, Pu; Starodubov, D.S.; Lynn, Brittany; Bock, Robert; Tur, Moshe

doi:10.1038/s41598-017-17580-y

Cited by 93 publications

(59 citation statements)

References 51 publications

(63 reference statements)

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“…This is due to the factor 2 cos(ψ r ) = 1.782 in (14) and (18) which enhances the variance of the corresponding building sway. 2 Scenario 2 yields the same results as scenario (σs, σp, σr) = (10, 5, 5) cm due to the symmetry of the problem, see (14) and (18). Prop.…”

Section: Simulation Resultsmentioning

confidence: 65%

Intelligent Reflecting Surfaces for Free Space Optical Communications

Najafi

Schober

2019

2019 IEEE Global Communications Conference (GLOBECOM)

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In this paper, we investigate the use of intelligent reflecting surfaces (IRSs) (i.e., smart mirrors) to relax the lineof-sight requirement of free space optical (FSO) systems. We characterize the impact of the physical parameters of the IRS, such as its size, position, and orientation, on the quality of the end-to-end FSO channel. In addition, we develop a statistical channel model for the geometric and the misalignment losses which accounts for the random movements of the IRS, transmitter, and receiver due to building sway. This model can be used for performance analysis of IRS-based FSO systems. Our analytical results shows that depending on the angle between the beam direction and the IRS plane, building sway for the IRS has either a smaller or larger impact on the quality of the end-to-end FSO channel than building sway for the transmitter and receiver. Furthermore, our simulation results validate the accuracy of the developed channel model and offer insight for system design.

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Section: Simulation Resultsmentioning

confidence: 65%

Intelligent Reflecting Surfaces for Free Space Optical Communications

Najafi

Schober

2019

2019 IEEE Global Communications Conference (GLOBECOM)

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“…Beam tracking techniques have been widely used for Gaussian modes and have been found to be convenient for increasing system performance [307]. Recently, beam tracking has been introduced to OAM wireless optical communication [308], [309]. OAM beam tracking operations have first been successfully applied to free space communication between two ground terminals relayed by an unmanned aerial vehicle (UAV) carrying a retroreflector achieving a transmission bit rate of 80 Gbit/s with two OAM channels [308].…”

Section: Beam Trackingmentioning

confidence: 99%

“…1) Free space optics: Maintaining the alignment between the laser and the external mode generation tool (a spatial light modulator for example) is crucial in FSO OAM links but can be sometimes complicated and not suitable for out- Excepting the use of mirrors to connect NLoS terminals [139], [308], using relays has not yet been investigated in communication involving spatial modes. A potential relaying scheme with a correct and forward capability could be explored.…”

Section: Open Problems and Future Research Directionsmentioning

confidence: 99%

Communicating Using Spatial Mode Multiplexing: Potentials, Challenges, and Perspectives

Trichili

Park

Zghal

et al. 2019

IEEE Commun. Surv. Tutorials

182

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Time, polarization, and wavelength multiplexing schemes have been used to satisfy the growing need of transmission capacity. Using space as a new dimension for communication systems has been recently suggested as a versatile technique to address future bandwidth issues. We review the potentials of harnessing the space as an additional degree of freedom for communication applications including free space optics, optical fiber installation, underwater wireless optical links, on-chip interconnects, data center indoor connections, radio frequency and acoustic communications. We focus on the orbital angular momentum (OAM) modes and equally identify the challenges related to each of the applications of spatial modes and the particular OAM modes in communication. We further discuss the perspectives of this emerging technology. Finally, we provide the open research directions and we discuss the practical deployment of OAM communication links for different applications. ). 4 in the future. We also summarize the open problems and the future research directions. A discussion of the practicability and cost of multi-OAM communication is also included. II. OAM POTENTIALS A. Free Space Optical CommunicationFSO is a license free wireless communication configuration that has recently received much interest for a variety of applications. FSO is an attractive solution for last mile connectivity problems, particularly for communication networks, when the installation of fiber optics is costly or not possible [66]. FSO can be also used to establish inter-building secure communication, and can be deployed as a backup to optical fibers. Wireless optical communication can guarantee a line-of-sight (LoS) high bit rate wireless transmission over long distances, up to several kilometers. Furthermore, FSO communication is considered as a promising technique to scale down bandwidth challenges in future 5G networks [67].Multiple wavelength FSO provides better transmission, as demonstrated in [68], [69]. Data can be mapped on advanced modulation formats to achieve high bit rates and high spectral efficiency levels [70]- [72]. Another option is multiple-input and multiple-output (MIMO) FSO communication in which multiple lasers are positioned to transmit Gaussian beams to multiple receiving apertures [73]. Over the last few years, it has been proven that it is possible to transmit information over spatially structured light beams [21], [74], [75] including OAM beams and plane waves. Our focus is on the OAM modes of light.The first PoC communication experiment incorporating OAMs in free space was carried out in 2004 by Gibson and co-workers [21]. Over a 15-meter long link, 8 -spaced values were chosen along the Gaussian beam as an alphabet for the communication. OAM beams were generated and detected using two light modulators. Since then, much progress has been made and free space transmission capacity of over 1 Tbit/s is, today, possible [76]- [78]. By performing three dimensional multiplexing, Huang and co-workers were able to attain a 100 Tbi...

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“…Many advances have been reported in recent years from terrestrial stationary links of a few kilometres [3][4][5], to satellite to ground links [6][7][8][9]. Tests on mobile terrestrial links using drones and UAVs are also being developed [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Optimising the interconnection of free-space to fibre quantum networks

2019

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Optimising the interconnection between free-space and fibre links will be necessary for future quantum communication networks. In daylight free-space quantum communication based on direct detection, the required Field Of View (FoV) of the receiver system needs to be minimised to reduce solar background noise coupling into the detectors. Reducing the FoV requires minimising beam wander effects caused by atmospheric turbulence through active optics. We implement a fine tracking system designed to correct tip and tilt wavefront aberrations, using two feedback loops; each of them consisting of a quadrant detector and a fast steering mirror for stabilising the beam in the whole optical axis of the receiver. We test the performance of the tracking system with different optical fibres in order to evaluate the reduction in the quantum bit error rate (QBER) caused by solar background noise. A reduction of 75% for single mode fibre was obtained, and 45% reduction for a 25 µm core diameter fibre, both cases for strong turbulence (Cn2~10-12 – 10-13 m-2/3) and 100 m propagating channel. These results look promising for enabling free-space Quantum Key Distribution (QKD) in wireless networks for realistic/adverse conditions such as daylight and strong turbulent regimes.

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High-Capacity Free-Space Optical Communications Between a Ground Transmitter and a Ground Receiver via a UAV Using Multiplexing of Multiple Orbital-Angular-Momentum Beams

Cited by 93 publications

References 51 publications

Intelligent Reflecting Surfaces for Free Space Optical Communications

Intelligent Reflecting Surfaces for Free Space Optical Communications

Communicating Using Spatial Mode Multiplexing: Potentials, Challenges, and Perspectives

Optimising the interconnection of free-space to fibre quantum networks

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