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40 GBit @ 240 GHz across 1 km LoS


-----Oorspronkelijk bericht-----
Van: Phil Fagan [mailto:philfagan at gmail.com] 
Verzonden: vrijdag 17 mei 2013 13:32
Aan: Eugen Leitl
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" <eugen at 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]