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 journal Nature Photonics reports about this success in its latest issue.
With
this experiment, the KIT scientists in the team of Professor Jürg
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." Calculation in the optical range turned out to be
not only extremely fast, but also highly energy-efficient, because
energy is required for the laser and a few process steps only.
"Our
result shows that physical limits are not yet exceeded even at
extremely high data rates", Leuthold says while having in mind the
constantly growing data volume on the internet. In the opinion of
Leuthold, transmission of 26 terabits per second confirms that even high
data rates can be handled today, while energy consumption is minimized.
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