Featured Research

from universities, journals, and other organizations

Lucent Technologies' Experimental 'No-Fiber Optical Data Link' Sets World Record For Free-Space Info Transmission

Date:
November 19, 1998
Source:
Lucent Technologies (Bell Labs)
Summary:
Scientists and engineers from Bell Labs, the research and development arm of Lucent Technologies, have demonstrated an innovative "no-fiber optical data link" and set a world record -- transmitting 2.5 gigabits (billion bits) of information per second, error free, through 2.4 kilometers (1.5 miles) of free space (air).

MURRAY HILL, N.J. - Scientists and engineers from Bell Labs, the research and development arm of Lucent Technologies, have demonstrated an innovative "no-fiber optical data link" and set a world record -- transmitting 2.5 gigabits (billion bits) of information per second, error free, through 2.4 kilometers (1.5 miles) of free space (air).

Commercial wireless data links, using multiple transmitters, operate at up to only 622 megabits (million bits) per second.

Worldwide demand for communications services is growing rapidly, and a network of multi-gigabit free-space data links could provide a high-capacity alternative to microwave links, optical fiber, or cable systems in places where those technologies are impractical or prohibitively expensive.

The experimental Lucent technology was developed in Bell Labs Government Solutions business. It integrates two custom-built telescopes, manufactured by AstroTerra Corp. in collaboration with Lucent, with standard optical transmitters and receivers and a high-power optical amplifier. Data is sent, through the air, from the transmitting telescope to the receiving telescope and focused onto the core of an optical fiber using coupling optics within the second telescope.

The Lucent team worked with colleagues at AstroTerra to test the system prototype at AstroTerra's facility in San Diego, Calif., and the group presented its results in a technical paper last week at the Photonics East conference in Boston. Co-authors of the paper are Paul Szajowski, Gerald Nykolak, James Auborn, Herman Presby and G.E. Tourgee, of Bell Labs, and E. Korevaar, J. Schuster, and I.I. Kim, of AstroTerra.

"This test stands as a remarkable achievement in wireless data communication," said AstroTerra President Eric Korevaar. "It's a watershed event in free-space optical technology."

The test combined innovative high-speed optoelectronic equipment developed by Lucent Technologies with AstroTerra's multiple-transmitter laser communication technology.

"There are numerous applications for connecting multi-gigabit data and communications networks where fiber-optic cables are not available or practical," said Mike Geller, Chief Technical Officer of Lucent's Government Solutions business. "This technology is compatible with our optical and data networking equipment, so we can hook up asynchronous-transfer-mode equipment, Internet packet switching systems and routers and other kinds of equipment at each end.

"It isn't intended to replace fiber, but rather to complement it," he said. "It fits niche applications. Because it requires a clear line of sight there are some places it can't go that fiber can, and adverse weather conditions, like heavy fog and snow, can present problems."

Potential applications for high-bandwidth optical wireless links include campus environments, multiple-building occupancy in metropolitan areas, and temporary data links where environment and cost make fiber connections impractical.

"Without alternate network system technologies and delivery topologies, overall effective network speed will be reduced and frequent bottlenecks within networks will become more commonplace in the very near future," predicted Szajowski.

Future plans for the Lucent team call for the development of 10-gigabit data rates, transmission across greater link distances, and the integration of wavelength division multiplexing (WDM) technology, a method for increasing capacity by transmitting information over multiple wavelengths, or colors, of light.

Lucent Technologies designs, builds and delivers a wide range of public and private networks, communications systems and software, consumer and business telephone systems and microelectronics components. Bell Labs is the research and development arm for the company. Further information about the company is available at http://www.lucent.com.

AstroTerra Corp. manufactures a full line of optical wireless data communications equipment, from the economical TerraLink 1000 to the high-speed TerraLink 8-622. More information on AstroTerra is available at http://www.astroterra.com.


Story Source:

The above story is based on materials provided by Lucent Technologies (Bell Labs). Note: Materials may be edited for content and length.


Cite This Page:

Lucent Technologies (Bell Labs). "Lucent Technologies' Experimental 'No-Fiber Optical Data Link' Sets World Record For Free-Space Info Transmission." ScienceDaily. ScienceDaily, 19 November 1998. <www.sciencedaily.com/releases/1998/11/981119073442.htm>.
Lucent Technologies (Bell Labs). (1998, November 19). Lucent Technologies' Experimental 'No-Fiber Optical Data Link' Sets World Record For Free-Space Info Transmission. ScienceDaily. Retrieved August 22, 2014 from www.sciencedaily.com/releases/1998/11/981119073442.htm
Lucent Technologies (Bell Labs). "Lucent Technologies' Experimental 'No-Fiber Optical Data Link' Sets World Record For Free-Space Info Transmission." ScienceDaily. www.sciencedaily.com/releases/1998/11/981119073442.htm (accessed August 22, 2014).

Share This




More Computers & Math News

Friday, August 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Is Apple's iMessage Really Being Overrun By Spammers?

Is Apple's iMessage Really Being Overrun By Spammers?

Newsy (Aug. 21, 2014) A report says more than one third of all SMS spam over the past year came from a "single campaign" using iMessage and targeting iPhone users. Video provided by Newsy
Powered by NewsLook.com
Families Can Now Ask Twitter To Remove Photos Of Deceased

Families Can Now Ask Twitter To Remove Photos Of Deceased

Newsy (Aug. 20, 2014) In the wake of a high-profile harassment case, Twitter says family members can ask for photos of dying or dead relatives to be taken down. Video provided by Newsy
Powered by NewsLook.com
Ballmer Leaves Microsoft's Board, Has Advice For Nadella

Ballmer Leaves Microsoft's Board, Has Advice For Nadella

Newsy (Aug. 19, 2014) In a letter to Microsoft CEO Satya Nadella, Ballmer said he's leaving the board of directors and offered tips on how the company can be successful. Video provided by Newsy
Powered by NewsLook.com
What Google Can Gain From Special Accounts For Children

What Google Can Gain From Special Accounts For Children

Newsy (Aug. 19, 2014) Google will reportedly offer official accounts for children younger than 13 years old. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins