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Frequency dissemination with free-space optical links

Mata Calvo, Ramon and Moll, Florian and Giggenbach, Dirk (2010) Frequency dissemination with free-space optical links. ESA Scientific Publications.

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Optical clock technology is very certain to be integrated in the next high precision time standards. The demand for higher accuracy in time synchronization makes the use of free-space optical links necessary for frequency dissemination, especially if mobile partners are involved. These links are the most suitable solution in order to disseminate high frequencies in between satellites, ground stations, aircrafts, and any other mobile vehicles. However, setting up an optical link requires good knowledge of the atmospheric channel as well as sophisticated engineering technology. The available facilities at DLR Institute of Communications and Navigation, Optical Communications Group, offer the opportunity of performing frequency dissemination measurements by using its aeronautic terminals and optical ground station. These facilities were already successfully used for measurements of the atmospheric channel, investigation of modulation formats and data communication applying optical downlinks from satellite, aircraft, and high-altitude platforms. For free-space optical links, atmospheric turbulence is one of the main impairments to deal with since it causes degradation of spatial and temporal coherence of the propagating wave. The application of adaptive optics is proposed here to correct for these impairments and thus to achieve stable frequency transfer. In this paper, based on the former and current field trials of free-space optical communication links, we present possible link scenarios in which the channel behavior for frequency transfer can be investigated and name the main challenges to overcome.

Item URL in elib:https://elib.dlr.de/64131/
Document Type:Article
Title:Frequency dissemination with free-space optical links
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Mata Calvo, RamonRamon.MataCalvo (at) dlr.deUNSPECIFIED
Moll, FlorianFlorian.Moll (at) dlr.deUNSPECIFIED
Giggenbach, DirkDirk.Giggenbach (at) dlr.deUNSPECIFIED
Date:16 April 2010
Journal or Publication Title:ESA Scientific Publications
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Frequency dissemination, free-space optical links, adaptive optics
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignment
DLR - Research area:Space
DLR - Program:W - no assignment
DLR - Research theme (Project):W - no assignment (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation
Deposited By: Mata Calvo, Ramon
Deposited On:11 Jan 2011 11:18
Last Modified:31 Jul 2019 19:27

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