Posted on 05/24/2011 7:27:08 AM PDT by Red Badger
Scientists at Karlsruhe Institute of Technology (KIT) have succeeded in encoding data at a rate of 26 terabits per second on a single laser beam, transmitting the data over a distance of 50 kilometers, and decoding the information successfully. This is the largest data volume ever transported on a laser beam. The process developed by KIT enables the transmission of 700 DVDs' worth of content in just one second.
The advance is reported in the journal Nature Photonics.
In this experiment, KIT scientists led by Professor Jürg Leuthold beat their own record in high-speed data transmission of 2010, when they exceeded the magic limit of 10 terabits per second -- 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. Leuthold's team applies the so-called orthogonal frequency division multiplexing (OFDM) for record data encoding. For many years, this process has been used successfully in mobile communications, based on mathematical routines (Fast Fourier Transformation).
"The challenge was to increase the process speed not only by a factor of 1,000, but by a factor of nearly a million for data processing at 26 terabits per second," explains Leuthold, who heads the Institutes of Photonics and Quantum Electronics and Microstructure Technology at KIT. "The decisive innovative idea was optical implementation of the mathematical routine."
(Excerpt) Read more at sciencedaily.com ...
26 TBit Ping!............
tech bkmk
Full 3D, VR, sensurround, smell-o-vision porn, coming your way soon....
Maybe even feel-o-vision..............
Cool, but I’m still waiting for the fiber optic “last mile” to get here.
Pretty good, considering the carrier frequency of visible light is about 500 THz. That means that they’re getting a data rate of about 5% of baseband. I would imagine you could actually see a color shift in the laser light due to modulation (assuming it’s a visible laser, which it may well not be).
IIRC, modulation of a laser beam would not shift the frequency and therefore the color. It would shift the intensity and the modulation would show up if possible as black holes in the beam, depending on the phasing.............
You mean Algore hasn’t showed up at your house with a spool of cable over his arm and a pair of wire cutters in his hand?.................
Bravo!
That is way cool, wonder how they did it? I can see doing simple arithmetic but FF Transformations? Wow!
Grace Hopper would have to cut a piece of fiber just less than 1mm to represent a bit at that data rate given light’s propagation speed in fiber.
Nope....and if he did, I'd sic the dogs on him. Unfortunately, being Corgis, all they would do would be to run around under his feet, trying to get petted. Hopefully, though, he would trip over one of them.
Ahh... you're wrong. But don't let that stop you.
How could the frequency of the source be affected by the modulation which is applied after the source?................
Google "modulation theory." Perhaps you've heard the term "sideband." Or "sum and difference frequencies."
That's all undergraduate-level stuff.
You need to know Fourier and Laplace transforms if you want to really understand it. Again, undergraduate-level stuff.
Special thanks to Las Vegas Ron! (He really is from VEGAS!)
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