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Preliminary Results of Terabit-per-second Long-Range Free-Space Optical Transmission Experiment THRUST

Giggenbach, Dirk and Poliak, Juraj and Mata-Calvo, Ramon and Fuchs, Christian and Perlot, Nicolas and Freund, Ronald and Richter, Thomas (2015) Preliminary Results of Terabit-per-second Long-Range Free-Space Optical Transmission Experiment THRUST. In: Advanced Free-Space Optical Communication Techniques and Applications (9647B). SPIE Press. SPIE Security + Defence 2015, 21 - 24 Sept. 2015, Toulouse.

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Official URL: http://spie.org/ESD/conferencedetails/advanced-free-space-optical-communication-techniques-and-applications

Abstract

Future Very High Throughput Satellite Systems (VHTS) will perform at several Tbit/s throughput and thus face the challenge of limited feeder-link spectrum. Whereas with conventional RF feeder links several tens of ground gateway stations would be required, the total capacity can alternatively be linked through a single optical ground station using Dense Wavelength Division Multiplexing (DWDM) techniques as known from terrestrial fiber communications. While intermittent link blockage by clouds can be compensated by ground station diversity, the optical uplink signal is directly affected by scintillation and beam wander induced by the atmospheric index-of-refraction turbulence. The transmission system must be capable to mitigate these distortions by according high-speed tracking and fading compensation techniques. We report on the design of a near-ground long-range (10km) atmospheric transmission test-bed which is, with its relatively low elevation of 1.8 degrees, exemplary for a worst case GEO uplink scenario. The transmitting side of the test-bed consists of a single telescope with a a fine pointing assembly in order to track the atmospheric angle-of-arrival and precisely aim towards the beacon of the receiver. On the other side of the test-bed, the receiver telescope is also capable of fine pointing by tracking the transmitted signal. The GEO uplink scenario is modelled by a precise scaling of the beam divergence and the receiver’s field of view as well as by the beacon offset to model the point-ahead angle. In order to make the experimental test-bed correspond to an actual feeder link scenario, the link budget as well as the turbulence profile of the experimental scenario are modelled and compared to the GEO uplink. Several DWDM channels are multiplexed to reach the total link capacity of above one Tbit/s. We report on the preparatory lab tests, and the free-space test-bed design and verification, of the Terabit Throughput Satellite Technology Project THRUST.

Item URL in elib:https://elib.dlr.de/98457/
Document Type:Conference or Workshop Item (Speech)
Title:Preliminary Results of Terabit-per-second Long-Range Free-Space Optical Transmission Experiment THRUST
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Giggenbach, DirkDLR-IKNUNSPECIFIED
Poliak, Jurajjuraj.poliak (at) dlr.deUNSPECIFIED
Mata-Calvo, Ramonramon.matacalvo (at) dlr.deUNSPECIFIED
Fuchs, Christianchristian.fuchs (at) dlr.deUNSPECIFIED
Perlot, NicolasHHI-BerlinUNSPECIFIED
Freund, RonaldHHI-BerlinUNSPECIFIED
Richter, ThomasHHI-BerlinUNSPECIFIED
Date:October 2015
Journal or Publication Title:Advanced Free-Space Optical Communication Techniques and Applications
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
Laycock, LeslieBAE Systems
White, Henry J.BAE Systems
Publisher:SPIE Press
Status:Published
Keywords:Optical satellite feeder link, atmospheric beam distortions, beam pointing and tracking, multi-channel FSO by DWDM KNOCGOP
Event Title:SPIE Security + Defence 2015
Event Location:Toulouse
Event Type:international Conference
Event Dates:21 - 24 Sept. 2015
Organizer:SPIE
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication and Navigation
DLR - Research area:Raumfahrt
DLR - Program:R KN - Kommunikation und Navigation
DLR - Research theme (Project):R - Vorhaben Multimedia Satellitennetze
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Satellite Networks
Deposited By: Giggenbach, Dr.-Ing. Dirk
Deposited On:01 Dec 2015 09:23
Last Modified:31 Jul 2019 19:55

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