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40 GBit @ 240 GHz across 1 km LoS

Congrats! How does 240Ghz react to atmospheric conditions other than "clear
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]