Thankfully, data transmission speeds have come a long way since the days of dial-up when users would have plenty of time to twiddle their thumbs as they waited for an image or MP3 to make its way to their hard drive. These days, broadband cable currently supports speeds of around 30 megabits per second, which is a hell of an improvement. Now researchers have outdone that by a factor of around 85,000 by using twisted beams of light to transmit data at up to 2.56 terabits per second.
The system developed by the multi-national team led by the University of Southern California (USC) involved transmitting data twisted beams of light at ultra-high speeds. Using beam-twisted “phase holograms,” they manipulated eight beams of light so that each one twisted in a DNA-like helical shape as it propagated in free space. With each beam having its own twist that can be encoded with “1” and “0” data bits, they formed eight independent data streams.
Because the system could be used in high-speed satellite communication links, they attempted to simulate the sort of communications that might occur between satellites in space by transmitting data over open space in a lab. The system also has the potential to be used in short free-space terrestrial links, or to be adapted for use in fiber optic cables like those used by some Internet service providers.
While not quite at the world record-breaking data transmission speed of 26 terabits per second achieved last year by a team from Germany’s Karlsruhe Institute of Technology (KIT), the latest effort is still impressive.
“You’re able to do things with light that you can’t do with electricity,” said Alan Willner, electrical engineering professor at the USC Viterbi School of Engineering. “We didn’t invent the twisting of light, but we took the concept and ramped it up to a terabit-per-second.”
Willner is the author of an article about the research that was published in Nature Photonics on June 24.
Source: USC
professore - June 26, 2012 @ 04:12 am PDT
While there are probably lots of places where 1Gb/sec is offered, I get the impression that very few actually provide that. They usually offer "up to" 1 Gb/sec so as long as they don't actually provide you a better rate, they are telling the truth. I used to have a connection icon on my task bar that said I was connected "at 100 MB per second"--all the time. Needless to say it never got anywhere near that--ever.
What is annoying is there are houses just down the road from me, and they get 24. So, stop moaning everyone.
The big question is whether cable companies will make the switch or stall people in case a better technology comes out a few years down the road from when this twisty light hits the market. They could just tell customers that the rates they have are fine for everyone who is not a pirate or a pedophile and most basic web and e-mail users will buy it. They know that if someone starts up a rival company they can drop their prices faster than the newcomers can roll out an infrastructure.
There is technology on the market that will do several TB over single mode fiber with Raman amplification over huge distances.
In 2009 bell labs completed a test of 155 100G channels (15.5 TB/s) over a 7000 km fiber.