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-----Oorspronkelijk bericht----- Van: Phil Fagan [mailto:philfa...@gmail.com] Verzonden: vrijdag 17 mei 2013 13:32 Aan: Eugen Leitl CC: NANOG Onderwerp: Re: 40 GBit @ 240 GHz across 1 km LoS Congrats! How does 240Ghz react to atmospheric conditions other than "clear skys?" On May 17, 2013 4:17 AM, "Eugen Leitl" <eu...@leitl.org> wrote: > > Fraunhofer: > > http://www.iaf.fraunhofer.de/de/news-medien/pressemitteilungen/presse- > 2013-05-16.html > > Google Translate: > > New world record in data transmission by radio > > Press Release 16/05/2013 > > With a Langstreckendemonstrator between two skyscrapers in Karlsruhe, > a distance of over a kilometer could already be bridged. © KIT > > The RF chip is only 4 x 1.5 mm2 large, since electronic components > with the frequency or wavelength scale. > > © Fraunhofer IAF > > Researchers at the Fraunhofer Institute for Applied Solid State > Physics IAF and the Karlsruhe Institute of Technology KIT, it is able > to transmit 40 Gb / s at 240 GHz and over a distance of one kilometer > by radio. With its recent demonstration they have achieved a new world > record and establish for the first time seamlessly with the capacity > of fiber to. Such future radio links could close gaps in the provision > of broadband Internet by the wireless links complement the network of > hard to reach areas or in rural areas. > > Digital, mobile and networked - the changing media usage behavior and > require progressively increasing faster data transfer rates. The > expansion of the fiber network in Germany is lagging behind European > standards, such as the statistics of the industry organization FTTH > Council Europe show. To lay fiber optic lines is expensive and in the > case of natural or urban obstacles such as rivers and transport hubs > difficult. Broadband radio links can help to overcome such critical > points and so promote the expansion of network infrastructures. In > rural areas, they provide a cost effective and flexible alternative to > "Fibre To The Home 'in the expansion of broadband network dar. > > In the data transmission by radio researchers have set a new world > record for the first time fully integrated electronic transmitter and > receiver are designed for a frequency of 240 GHz, with which the data > transfer rates up to > 40 Gbit s is / possible. This corresponds to the transfer of a full > DVD in less than a second or 2400 DSL16000 Internet connections. With > a Langstreckendemonstrator a distance of over a kilometer could > already be covered, which was built by the Karlsruhe Institute of > Technology between two skyscrapers in the "Milli Link" project. "We > have managed to develop a wireless link based on active electronic > circuits similar to high data rates, such as fiber optic systems, and > thus a seamless integration of the radio link allows" said Professor > Ingmar Kallfass, the project initially at Fraunhofer IAF in looking a > shared professorship - supported by IAF and KIT - coordinated. > Kallfass since 2013 has been working at the University of Stuttgart, > where he continued to lead the project. > > High frequencies allow fast data transfer > > The use of the high frequency range between 200 and 280 GHz not only > enables the fast transfer of large amounts of data, but also a very > compact technical structure. Since the dimensions of electronic > circuits and antennas scalable with frequency or wavelength of the > transmitter and receiver chip is 4 x > 1.5 > mm 2 in size. Developed at Fraunhofer IAF semiconductor technology > based on transistors with high electron mobility transistor (HEMT) > makes it possible to use the frequency range between 200 and 280 GHz > with active transmitters and receivers in the form of compact, > integrated circuits. In this frequency range, the atmosphere has low > attenuation values, so that broadband radio links are possible. "This > is our spark gap compared to optical data transmission systems easier > to align and work in bad weather conditions such as fog or rain," > explains Jochen antes from the KIT. > > So far, radio systems were not yet able to provide the bandwidth of an > optical fiber directly. That could change in the future, as the test > shows construction of the project. Such a powerful system possess the > advantage of the so-called bit transparency, ie, the signal could be > fed directly to a fiber without energy-intensive recoding in a radio > link, transmit and re-routed at the other end with a glass fiber. The > record data from the test set are just the beginning. "With an > improvement in spectral efficiency through the use of complex > modulation formats or combination of channels, ie multiplexing, we can > achieve even higher data rates, 'said Antes is safe. > This could be the expansion of broadband network a boost. Maybe > Germany will in future no longer lies in Europe compared to the rear > seats. > > About the project > > The project "Milli Link" is supported by the German Federal Ministry > of Education and Research within the funding program "broadband access > next generation networks" with a total of two million euros. Besides > the two research institutes Fraunhofer IAF and KIT industry partner > Siemens AG, Kathrein KG and Radiometer Physics GmbH are involved in > the project. The aim of the project is the integration of wireless > links or radio links in broadband optical communication networks in > order to provide particular to rural areas with fast Internet access. > Other possible applications include indoor wireless local area > networks (WLAN), wireless personal area networks (WPAN), and > intra-machine and board-to-board communication. > > Milli link Langstreckendemonstrator (print quality) > [1.6095294952392578 MB JPG] Milli link radio frequency chip (print > quality) [1.7061738967895508 MB JPG] > >
