20,330 Hits in 6.5 sec

Reduction of the Beam Pointing Error for Improved Free-Space Optical Communication Link Performance [article]

I. N'Doye and W. Cai and A. Alalwan and X. Sun and W. G. Headary and M.-S. Alouini and B.-S. Ooi and T.-M. Laleg-Kirati
2021 arXiv   pre-print
This paper proposes a robust control law for free-space optical (FSO) beam pointing error systems under controlled weak turbulence conditions.  ...  Furthermore, we evaluate the closed-loop outage probability error and bit error rate (BER) that quantify the free-space optical communication performance in fading channels.  ...  To the best of the authors' knowledge, designing a beam pointing error control for improved FSO link performance has not been thoroughly investigated.  ... 
arXiv:2102.04926v1 fatcat:mhjmpvbyczdjtcpmdtaihrdbti

Effects of aperture averaging and beam width on Gaussian free space optical links in the presence of atmospheric turbulence and pointing error

It Ee Lee, Zabih Ghassemlooy, Wai Pang Ng
2012 2012 14th International Conference on Transparent Optical Networks (ICTON)  
This paper investigates the performance of free-space optical (FSO) communication systems under the influence of atmospheric loss, turbulence and pointing error.  ...  The bit-error rate (BER) and average channel capacity are evaluated, taking into account the effects of aperture averaging and beam width.  ...  INTRODUCTION Free-space optical (FSO) communications is an emerging broadband wireless access candidate, which has attracted significant attention for a variety of applications, such as horizontal-path  ... 
doi:10.1109/icton.2012.6253851 fatcat:qj4wcldxnbe7rjjs7ik2imnwhe

Adaptive optics pre-correction for optical feeder links: breadboard performance

Rudolf Saathof, Remco den Breeje, Wimar Klop, Niek Doelman, Thijs Moens, Michael Gruber, Tjeerd Russchenberg, Federico Pettazzi, Jet Human, Ramon Mata Calvo, Juraj Poliak, Ricardo Barrios (+5 others)
2019 International Conference on Space Optics — ICSO 2018  
For the next generation of very high throughput communication satellites, TNO and DLR envision optical free-space communication between ground stations and geostationary telecommunication satellites to  ...  The paper shows that AO is clearly beneficial for the downlink performance. In addition the first preliminary experimental results of the pre-correction show it is also beneficial for the uplink.  ...  In order to overcome this limit for bi-directional links between ground stations and very high throughput satellites at geostationary orbits, TNO and DLR envision optical free-space communication [2]  ... 
doi:10.1117/12.2536004 fatcat:xv6jhdri7fc5tg4ydaaab5g2jm

Optimising the interconnection of free-space to fibre quantum networks

Alejandro Ocampos-Guillén, Natalia Denisenko, Verónica Fernández-Mármol, D. Mogilevtsev
2019 EPJ Web of Conferences  
the whole optical axis of the receiver, which performs better than using one stabilisation point.  ...  MOTIVATION Future quantum communication networks will include both fibre and free-space links.  ... 
doi:10.1051/epjconf/201919800007 fatcat:3xmikjmqf5dtjfhc7s4hwbcxlm

Front Matter: Volume 7091

Proceedings of SPIE, Arun K. Majumdar, Christopher C. Davis
2008 Free-Space Laser Communications VIII  
G. de Oliveira, Univ. of Karlsruhe (Germany) SESSION 5 EXPERIMENTAL MEASUREMENTS, CONCEPTS, AND PERFORMANCE I 0J Large area adaptive avalanche photodetector arrays for free-space optical communication  ...  Publication of record for individual papers is online in the SPIE Digital Library.  ...  The performance of free space links can also be improved by forward error Author Index vi Introduction This volume contains the papers submitted and accepted as full manuscripts following presentation  ... 
doi:10.1117/12.806330 fatcat:e2aave5buzdnjgotwsme5aes24

Rate-adaptive selective relaying using time diversity for relay-assisted FSO communications

Ruben Boluda-Ruiz, Antonio Garcia-Zambrana, Beatriz Castillo-Vazquez, Carmen Castillo-Vazquez
2015 2015 IEEE Global Conference on Signal and Information Processing (GlobalSIP)  
Rubén Boluda-Ruiz Free-space optics (FSO) Global SIP 2015 5 / 22 Error-rate performance analysis for a 3-way cooperative FSO system J The motivation is to analyze the error-rate performance for a 3-way  ...  J . . . can significantly improve the performance by creating diversity using transceivers available at the other nodes of the network.  ...  Concluding remarks Cooperative communications can improve the error-rate performance without much increase in hardware.  ... 
doi:10.1109/globalsip.2015.7418416 dblp:conf/globalsip/Boluda-RuizGCC15 fatcat:hjp3nbrmx5h6dilbxe3zbfaduu

Optical transfer in space communication

Andrea Farkasvölgyi, István Frigyes
2018 Infocommunications journal  
This paper presents the possibilities of Free-space optical connection (FSO) in space communication in case of satellite-to-spacecraft or satellite-to-satellite link.  ...  of multichannel or more precise diversity systems, which we recommend for space communication.  ...  The International Telecommunication Union (ITU) defines deep space as a distance that is larger than 2 million km, so  ... 
doi:10.36244/icj.2018.3.2 fatcat:6csfaczdwnfzdlaqi25hq5skvy

Challenges to Inter-Satellite Communication System: A Review

Abdallah Ahmad, Mohd Nazri
2016 International Journal of Computer Applications  
Inter-Satellite communication link is the valuable technique to establish the link between satellites. It is revolutionary technique in which laser is used to transmit data from one side to another.  ...  This paper briefly explains overview of this technology. Furthermore, various challenges to this technology are also reported.  ...  Indoor optical remote communication is known as remote infrared communication whereas outdoor optical remote communication is known as free space optical (FSO) communication.  ... 
doi:10.5120/ijca2016911150 fatcat:2zudh74znbcg5mmdln2rf4jx7m

Performance of OFDM based FSO Communication Systems using M-ary PSK Modulation

M. Selvi, K. Murugesan
2012 International Journal of Computer Applications  
In this paper, the performance of Radio on Free Space Optics (RoFSO) a cost effective and efficient method of wireless transmission that supports high data rate of communication as compared to optical  ...  The performance analysis shows that 3 to 5 dB SNR improvement is obtained for such system compared with RF wireless OFDM system.  ...  CONCLUSION The simulation of the OFDM based Free Space Optical environment using log-normal distribution shows that OFDM performance is improved in free space optics as compared to the RF wireless system  ... 
doi:10.5120/7642-0729 fatcat:mir6hpzezzgctf2l7d5ub2v25a

Free Space Optical Interconnects Security Aspects of Future High Speed Technology

Priyanka Jangir, Bhupendra Suman, Rashmi Chaudhary
2014 International Journal of Computer Applications  
Free space optical (FSO) communication involves the use of optical or laser beams to send the information through the atmosphere.  ...  In this paper we review the recent advances made in the field of data security for the FSO link along with certain aspects of FSO which make this technology most secure than the other existing technologies  ...  All this presents free space optical communications to be an attractive alternative for many kinds of wireless communication scenarios.  ... 
doi:10.5120/16642-6612 fatcat:tnvpz5xw5fhppmgwyivw7meape

Optical Communication in Space: Challenges and Mitigation Techniques

Hemani Kaushal, Georges Kaddoum
2017 IEEE Communications Surveys and Tutorials  
The first part of the paper will focus on various types of impairments that pose a serious challenge to the performance of optical communication system for ground-to-satellite or satellite-to-ground and  ...  It also uniquely presents a recently developed technique using orbital angular momentum for utilizing the high capacity advantage of the optical carrier in case of space-based and near-Earth optical communication  ...  Due to narrow beam divergence of the optical carrier, accurate acquisition and pointing becomes very challenging for the space-based optical communication links.  ... 
doi:10.1109/comst.2016.2603518 fatcat:zv3fa7k2pbet3pi6gphq6izqae

Study of Various Challenges In IS-OWC – A Review

Abhishek Sharma
2017 International Journal for Research in Applied Science and Engineering Technology  
Satellite optical wireless communication system (Is-OWC) communication usually involves directed line-of-sight LOS and point-topoint laser links from transmitter to receiver through the atmosphere.  ...  The author investigated the outage behavior of optical inter-satellite communication links.  ...  The author examined his work on the error performance for convolution coded on-off keying free space optical communication to communicate over strong turbulence and misaligned fading channels.  ... 
doi:10.22214/ijraset.2017.8112 fatcat:q4fi6mbq55hpvdx5tqpwp4qlsy

Free space optical communications utilizing MEMS adaptive optics correction

Charles A. Thompson, Michael W. Kartz, Laurence M. Flath, Scott C. Wilks, Richard A. Young, Gary W. Johnson, Anthony J. Ruggiero, Jennifer C. Ricklin, David G. Voelz
2002 Free-Space Laser Communication and Laser Imaging II  
Free space optical communications (FSO) are beginning to provide attractive alternatives to fiber-based solutions in many situations.  ...  In this paper, we propose a method to improve signal quality through the use of adaptive optics.  ...  The use of adaptive optics systems based on MEMS will, in principle, allow us to extend free space communications distances, improve performance (from a Bit Error Rate, BER, standpoint), and overall transceiver  ... 
doi:10.1117/12.451463 fatcat:vrvsxyb6k5bsxm5m3x4rbnujse

QKD optical ground terminal developments

Wimar Klop, Rudolf Saathof, Niek Doelman, Michael Gruber, Thijs Moens, Clara I. Osorio Tamayo, Cristina Duque, Zoran Sodnik, Bruno Cugny, Nikos Karafolas
2021 International Conference on Space Optics — ICSO 2020  
Free space optical (FSO) satellite communications has very attractive properties for Quantum Key Distribution (QKD).  ...  These technologies apply to the receiver side of the QKD link, the Optical Ground Terminal.  ...  In the field of free space optical communication, we work on bot space and ground optical terminals.  ... 
doi:10.1117/12.2599217 fatcat:5fzicwbh2bdrjphoye6p7ubmum

Double-loop wavefront tilt correction for free-space quantum key distribution

Alejandro Ocampos-Guillen, Jorge Gomez-Garcia, Natalia Denisenko, Veronica Fernandez
2019 IEEE Access  
These results are promising for enabling QKD free-space links and their interconnection to fiber optic infrastructure in realistic scenarios of communication networks of high turbulence regimes and daylight  ...  Both free-space and optical fiber quantum key distribution (QKD) links will coexist in future quantum networks, requiring efficient coupling between both types of channels.  ...  This correcting system can therefore help improve the connectivity of free-space to fiber-optic telecommunication networks for the case of SMF results.  ... 
doi:10.1109/access.2019.2933694 fatcat:kz7pu33h7bbpvazymvmn4xjrsy
« Previous Showing results 1 — 15 out of 20,330 results