Fraunhofer: http://www.iaf.fraunhofer.de/de/news-medien/pressemitteilungen/presse-2013-0... 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]