Sign in with
Sign up | Sign in

Record-Speed Last-Mile Wireless Data Bridge Demonstrated

By - Source: KIT | B 9 comments

Researchers have developed a technology that could be used for "last mile" requirements to provide high-speed digital communications in terrain that would normally not be suited for broadband installations.

The "wireless bridge" connecting two fiber-optic links ran at 220 GHz and achieved a bandwidth of up to 20 billion bits of data per second, which translates to about 18.6 Gbps.

"Instead of investing in the cost of digging trenches in the ground and deploying ducts for the fibers, data is transmitted via the air—over a high-speed wireless link," said Swen Koenig, a researcher at Karlsruhe Institute of Technology's (KIT) Institute of Photonics and Quantum Electronics, who will present the findings at the Optical Fiber Communication Conference and Exposition/National Fiber Optic Engineers Conference, which takes place in Los Angeles from March 4-8. Koenig said that wireless technology is an "inexpensive, flexible, and easy-to-implement solution" for the last mile problem.

In their test setup, the researchers converted an optical signal to an electronic signal and encoded it to be transferred via a 220 GHz radio frequency carrier. The modulated carrier is connected to the antenna which "radiates" the signal and enables the receiving wireless gateway to capture the signal. First experiments succeeded over a distance of just 50 centimeters and later over a distance of 20 meters, about 66 feet. The researchers believe that the range will eventually reach about 20 km, or about 65,600 feet.

Discuss
Display all 9 comments.
This thread is closed for comments
Top Comments
  • 10 Hide
    A Bad Day , March 1, 2012 11:39 AM
    "Koenig said that wireless technology is an "inexpensive, flexible, and easy-to-implement solution" for the last mile problem."

    Elsewhere, in an ISP company...

    "We have a monopoly over this area! Why should we invest in our infrastructure and not in more yachts?!"
Other Comments
  • -4 Hide
    house70 , March 1, 2012 10:52 AM
    They could use directional antennas.
  • 10 Hide
    A Bad Day , March 1, 2012 11:39 AM
    "Koenig said that wireless technology is an "inexpensive, flexible, and easy-to-implement solution" for the last mile problem."

    Elsewhere, in an ISP company...

    "We have a monopoly over this area! Why should we invest in our infrastructure and not in more yachts?!"
  • 0 Hide
    palladin9479 , March 1, 2012 12:29 PM
    This tech will most likely be using directional antennas. You can get a 802.11g signal to go 2km+ using a pringles can and some sort of sighting system. It's very sensitive to getting both ends pointed directly at each other, but otherwise a great way to defeat the inverse square law.
  • -6 Hide
    shin0bi272 , March 1, 2012 1:54 PM
    220ghz = 18.6gb/s @ 50cm ?

    what will the ghz have to be to keep that speed over the distance of 20km? Were gonna be talking terahertz range arent we?
  • 1 Hide
    jhansonxi , March 1, 2012 2:30 PM
    As a last-mile link it will probably be omni-directional. The high frequency will limit reception to line-of-sight. The paper indicated 1km is feasible with attenuation from heavy rain.

    But I don't see it as really helpful for last-mile connections. If you're going to pull fiber, there is little reason to not go the final mile unless there is some major building structural problems that prevent it.

    However, this would make a great WiFi replacement.
  • 1 Hide
    zodiacfml , March 1, 2012 2:49 PM
    220 GHz? that's insane microwave frequencies which could work at 20km distance.......in a vacuum!
    As posted above, 1km could be possible accounting rain and other factors.
  • 0 Hide
    beetlejuicegr , March 1, 2012 5:46 PM
    rofl will we boil our brains while we pass near it i guess? On another news new microwave tank built at USA :p  (Command and conquer style lol)
  • 0 Hide
    warmon6 , March 1, 2012 6:17 PM
    shin0bi272220ghz = 18.6gb/s @ 50cm ? what will the ghz have to be to keep that speed over the distance of 20km? Were gonna be talking terahertz range arent we?


    You need to look at the other direction for Hz and Range.

    The lower the Hz, the farther it can go farther on the same power (or at least isn't hampered with objects as bad).

    Higher Hz = shorter range and is blocked by objects far more easily.



    Best way to view this is either try a 2.4/5 Ghz router or drive as far as you can on your favorite FM and AM radio stations.




    The only reason why i could see them using 220Ghz (besides what the FCC will allow) is that what is needed to push that kind of bandwidth (High Hz = more bandwidth for data)
  • 2 Hide
    dalethepcman , March 1, 2012 9:24 PM
    This could really improve competition in the ISP field. It is much easier to lease a small piece of someone's roof than it is to get permits to dig up every street in a 1km radius to lay your own coax/telephone/fiber lines.