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World record in ultra-rapid data transmission
Date:5/23/2011

This release is available in German.

Scientists of Karlsruhe Institute of Technology (KIT) have suc-ceeded in encoding data at a rate of 26 terabits per second on a single laser beam, transmitting them over a distance of 50 km, and decoding them successfully. This is the largest data volume ever transported on a laser beam. The process developed by KIT allows to transmit the contents of 700 DVDs in one second only. The renowned journal "Nature Photonics" reports about this success in its latest issue (DOI: 10.1038/NPHOTON.2011.74).

With this experiment, the KIT scientists in the team of Professor Jrg Leuthold beat their own record in high-speed data transmission of 2010, when they exceeded the magic limit of 10 terabits per sec-ond, i.e. a data rate of 10,000 billion bits per second. This success of the group is due to a new data decoding process. The opto-electric decoding method is based on initially purely optical calculation at highest data rates in order to break down the high data rate to smaller bit rates that can then be processed electrically. The initially optical reduction of the bit rates is required, as no electronic processing methods are available for a data rate of 26 terabits per second.

The team of Leuthold applies the so-called orthogonal frequency division multiplexing (OFDM) for record data encoding. For many years, this process has been used successfully in mobile communi-cations. It is based on mathematical routines (Fast Fourier Trans-formation). "The challenge was to increase the process speed not only by a factor of 1000, but by a factor of nearly a million for data processing at 26 terabits per second," explains Leuthold who is heading the Institutes of Photonics and Quantum Electronics and Microstructure Technology at KIT. "The decisive innovative idea was optical implementation of the mathematical routine."
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Contact: Monika Landgraf
presse@kit.edu
49-721-608-47414
Helmholtz Association of German Research Centres
Source:Eurekalert  

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