Featured Research

from universities, journals, and other organizations

World's longest laser -- 270 km long -- created

Date:
December 16, 2009
Source:
Aston University
Summary:
A 270-kilometer optical fiber has been transformed into the world's longest laser, a feat its inventors believe will lead to a radical new outlook on information transmission and secure communications.

World's longest laser -- channelled through 270 km fiber optic cable.
Credit: Image courtesy of Aston University

A 270-kilometre optical fiber has been transformed into the world's longest laser, a feat its inventors believe will lead to a radical new outlook on information transmission and secure communications.

Related Articles


Engineering academics at Aston University, UK, are leading research into ultralong fiber lasers, to create a platform capable of delivering 'next generation' information transmission, including telecommunications and broadband.

When normal telephone conversations or data sent over the internet are converted to light in order to travel through standard optical fibers the signals lose around 5 per cent of their power for every kilometre that they travel. The signals then have to be amplified to ensure that they reach their destination, a process which creates background noise and affects the signals quality.

Using a physical process called the Raman effect*, a natural phenomenon that affects light passing through a material and fiber Bragg gratings to reflect light at both ends of the fiber, the team can create a uniform distribution of light through a cavity in the optical fiber. This scheme also presents an ultra-long fiber laser offering new opportunities for handling ultra-fast communications at a high operational capacity.

Professor Sergei Turitsyn from Aston University's Photonics Research team believes the 270km Ultralong Raman Fiber Laser, (the result presented in a recent issue of Physical Review Letters), has pushed laser technology to completely new territories. It increases by a factor of three the Research team's previous record result with laser of 75km, reported in 2006.

The UK team have been collaborating with the Instituto de Optica, Madrid, Spain and Institute of Automation and Electrometry, Novosibirsk, Russia to achieve this record result.

"The demands on communication systems are increasing significantly, particularly with the huge growth of internet traffic. This technology offers a new platform for improving the speed, reliability and the operational capacity of future optical communication systems," said Prof Turitsyn.

"However, even more interesting is a fundamentally new way the laser is used -- as a transmission medium, rather than a source of coherent radiation. Despite extraordinary advances in laser science, only recently have the fundamental limits of laser cavity length become an area of exploration. One important new concept here is that an ultra-long laser cavity implemented in optical fiber can be seen as a new unique type of a transmission medium. This might lead to a radical new outlook on information transmission and secure communications."

*Note: The Raman effect (a natural phenomenon that affects light passing through a material) is used to transform a long optical fibre into an ultra-long laser. Lasers inject light at each end of the fiber, which makes some of the fiber's atoms give out more energy and emit photons (particles of light) of a longer wavelength. These photons are reflected back into the fiber by special mirrors at each end of the optical link. The fiber then stores a stable, uniform amount of laser light that travels with the signals and strengthens them, enabling them to move across the fiber at full power without suffering any loss, so removing the need to amplify the signals.


Story Source:

The above story is based on materials provided by Aston University. Note: Materials may be edited for content and length.


Cite This Page:

Aston University. "World's longest laser -- 270 km long -- created." ScienceDaily. ScienceDaily, 16 December 2009. <www.sciencedaily.com/releases/2009/12/091215160000.htm>.
Aston University. (2009, December 16). World's longest laser -- 270 km long -- created. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2009/12/091215160000.htm
Aston University. "World's longest laser -- 270 km long -- created." ScienceDaily. www.sciencedaily.com/releases/2009/12/091215160000.htm (accessed October 24, 2014).

Share This



More Matter & Energy News

Friday, October 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

IKEA Desk Converts From Standing to Sitting With One Button

IKEA Desk Converts From Standing to Sitting With One Button

Buzz60 (Oct. 24, 2014) IKEA is out with a new convertible desk that can convert from a sitting desk to a standing one with just the push of a button. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com
Ebola Protective Suits Being Made in China

Ebola Protective Suits Being Made in China

AFP (Oct. 24, 2014) A factory in China is busy making Ebola protective suits for healthcare workers and others fighting the spread of the virus. Duration: 00:38 Video provided by AFP
Powered by NewsLook.com
Real-Life Transformer Robot Walks, Then Folds Into a Car

Real-Life Transformer Robot Walks, Then Folds Into a Car

Buzz60 (Oct. 24, 2014) Brave Robotics and Asratec teamed with original Transformers toy company Tomy to create a functional 5-foot-tall humanoid robot that can march and fold itself into a 3-foot-long sports car. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Police Testing New Gunfire Tracking Technology

Police Testing New Gunfire Tracking Technology

AP (Oct. 24, 2014) A California-based startup has designed new law enforcement technology that aims to automatically alert dispatch when an officer's gun is unholstered and fired. Two law enforcement agencies are currently testing the technology. (Oct. 24) Video provided by AP
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:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

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