Optical technologies for very high throughput satellite communications
| Autor: | Fabian Rein, Raphael Wolf, Andrew P. Reeves, Juraj Poliak, Karen Saucke, Ricardo Barrios, Helawae Friew Kelemu, Mathias Richerzhagen, Carlos Eduardo Carrizo, Annika Dochhan, Wolfram Luetke, Ramon Mata Calvo, Janis Surof |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
very high throughput satellites
business.product_category Computer science business.industry Electrical engineering free-space optical communications Satellie communications optical communications world record atmospheric turbulence adaptive optics High-throughput satellite digital homodyne Telecommunications link Broadband Communications satellite Internet access Geostationary orbit Satellite business coherent communications Phase-shift keying |
| Zdroj: | Free-Space Laser Communications XXXI. |
| DOI: | 10.1117/12.2513819 |
| Popis: | Broadband internet access has become a vertex for the future development of society and industry in the digital era. Geostationary orbit (GEO) satellite can provide global broadband coverage, becoming a complementary solution to optical fiber network. Low-earth-orbit (LEO) constellations have been proposed in the last years and they may become a reality soon, but still based on radiofrequency for the ground-to-satellite links. Optical technologies offer multiple THz of available spectrum, which can be used in the feeder link. The DLR’s Institute of Communications and Navigation has demonstrated Terabit-per-second throughput in relevant environment for GEO communications, in terms of the turbulent channel. In 2016 DLR set the world-record in freespace communications to 1.72 Tbit/s, and in 2017 to 13.16 Tbit/s. Two terminals, emulating the satellite and the ground station have been developed. Bi-directional communications link with single-mode-fiber coupling at both ends was demonstrated. Adaptive optics for the downlink and uplink (pre-distortion) improved the fiber-coupling in downlink and decreased signal fluctuations in uplink. A 80 Gbit/s QPSK system based on digital homodyne reception was also developed, demonstrating the use of coherent communications under strong turbulence conditions. These activities were performed in the frame of two internal DLR projects, THRUST and Global Connectivity Synergy project. Several measurement campaigns took place in the last years in a valley-to-mountain-top test-link. Turbulence has been monitored at both ends and the point-ahead-angle has been emulated by separating the downlink beacon from the receiving aperture. An overview of the system and the main results will be presented. |
| Databáze: | OpenAIRE |
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