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Laser Guide Stars for Optical Free-Space Communications

Mata Calvo, Ramon and Bonaccini Calia, Domenico and Barrios, Ricardo and Centrone, Mauro and Giggenbach, Dirk and Lombardi, Gianluca and Becker, Peter and Zayer, Igor (2017) Laser Guide Stars for Optical Free-Space Communications. In: Proceedings of SPIE - The International Society for Optical Engineering, 10096 (27), 100960R-100960R. SPIE. SPIE Photonics West 2017, 28 Januar-2 Februar, San Francisco, USA.

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Official URL: http://dx.doi.org/10.1117/12.2256666


The German Aerospace Center (DLR) and the European Southern Observatory (ESO) performed a measurement campaign together in April and July 2016 at Teide-Observatory (Tenerife), with the support of the European Space Agency (ESA), to investigate the use of laser guide stars (LGS) in ground to space optical communications. Atmospheric turbulence causes strong signal fluctuations in the uplink, due to scintillation and beam wander. In space communications, the use of the downlink channel as reference for pointing and for pre-distortion adaptive optics is limited by the size of the isokinetic and isoplanatic angle in relation to the required point-ahead angle. Pointing and phase errors due to the decorrelation between downward and upward beam due to the point-ahead angle may have a severe impact on the required transmit power and the stability of the communications link. LGSs provide a self-tailored reference to any optical ground-to-space link, independently of turbulence conditions and required point-ahead angle. In photon-starved links, typically in deep-space scenarios, LGSs allow dedicating all downlink received signal to communications purposes, increasing the available link margin. The scope of the joint DLR-ESO measurement campaign was, first, to measure the absolute value of the beam wander (uplink-tilt) using a LGS, taking a natural star as a reference, and, second, to characterize the decrease of correlation between uplink-tilt and downlink-tilt with respect to the angular separation between both sources. This paper describes the experiments performed during the measurement campaigns, providing an overview of the measured data and the first outcomes of the data post-processing.

Item URL in elib:https://elib.dlr.de/111105/
Document Type:Conference or Workshop Item (Speech)
Title:Laser Guide Stars for Optical Free-Space Communications
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Mata Calvo, Ramonramon.matacalvo (at) dlr.deUNSPECIFIED
Bonaccini Calia, DomenicoESOUNSPECIFIED
Barrios, RicardoRicardo.Barrios (at) dlr.deUNSPECIFIED
Giggenbach, DirkDirk.Giggenbach (at) dlr.deUNSPECIFIED
Becker, PeterP.Becker (at) dlr.deUNSPECIFIED
Zayer, IgoresocUNSPECIFIED
Journal or Publication Title:Proceedings of SPIE - The International Society for Optical Engineering
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:100960R-100960R
Series Name:Free-Space Laser Communication and Atmospheric Propagation XXIX
Keywords:Laser Guide Star, Ground-to-Space, Free-Space Optical Communications, Beam Wander, Isokinetic angle, Uplink, Channel, Laser Communications, KNOCGOP
Event Title:SPIE Photonics West 2017
Event Location:San Francisco, USA
Event Type:international Conference
Event Dates:28 Januar-2 Februar
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Optical Technologies and Applications
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation
Deposited By: Mata Calvo, Ramon
Deposited On:15 Mar 2017 11:09
Last Modified:31 Jul 2019 20:08

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