Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

World’s longest laser invented

15.02.2006


Academics at Aston University in Birmingham, UK have invented what is thought to be the world’s longest laser. They have transformed an optical fibre 75 kilometres long into the laser, which the team hopes will improve long distance transmissions across the World.



The new laser is special because it can transmit light signals over such a long distance without any loss of power, so the signal that is being sent barely deteriorates. When normal telephone conversations or data sent over the internet are converted to light in order to travel through standard optical fibres 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. But any time the signals get amplified, the background noise gets amplified too, until it gets so high the signals cannot be understood anymore.

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


The discovery is tremendously exciting, not only in the world of science, but in the world of telecommunications.

Dr. Ania-Castañón explains: ‘Lossless transmission of data has always been a dream goal in the world of communications. The development of a simple method to implement nearly ideal links between receiver and sender paves the way to important advances in long-distance telecommunications and opens exciting possibilities for research in other fields.’

Juan Diego Ania-Castanon | alfa
Further information:
http://www.aston.ac.uk

More articles from Physics and Astronomy:

nachricht Transportable laser
23.01.2018 | Physikalisch-Technische Bundesanstalt (PTB)

nachricht New for three types of extreme-energy space particles: Theory shows unified origin
23.01.2018 | Penn State

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Optical Nanoscope Allows Imaging of Quantum Dots

Physicists have developed a technique based on optical microscopy that can be used to create images of atoms on the nanoscale. In particular, the new method allows the imaging of quantum dots in a semiconductor chip. Together with colleagues from the University of Bochum, scientists from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute reported the findings in the journal Nature Photonics.

Microscopes allow us to see structures that are otherwise invisible to the human eye. However, conventional optical microscopes cannot be used to image...

Im Focus: Artificial agent designs quantum experiments

On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.

We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...

Im Focus: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

Rutgers scientists discover 'Legos of life'

23.01.2018 | Life Sciences

Seabed mining could destroy ecosystems

23.01.2018 | Earth Sciences

Transportable laser

23.01.2018 | Physics and Astronomy

VideoLinks Science & Research
Overview of more VideoLinks >>>