Siberian scientists are planning to transfer information via the world's longest laser

Siberian scientists create a system of transmitting information over long distances via fiber optic cable without amplifiers on the basis of established distributed super-long laser.

In late 2011, Russian scientists have successfully completed testing a new laser laboratory (on reels with optical fiber length is 300 km) and found that lasing is observed at a distance of over 300 km. This achievement in the ranking of the magazine «Optics and Photonics News» has been called "the discovery of 2010».

Until the end of February 2012, scientists plan to find out as far as possible the transfer of information.

The ability to transmit data for hundreds of kilometers without costly signal amplifiers, which are now set for every 70-100 kilometers of transmission lines, will allow companies to significantly reduce the costs of construction and maintenance of new lines. After the completion of laboratory tests, if successful, scientists will test their development "in the field" - on the actual links. Such work can be started in summer 2012.

Recall that the length of main fiber-optic lines in Russia is more than half a million kilometers.

The first laser light transmitted through the optical fiber learned English in 1961. Then there was the problem of the strong attenuation of the radiation in the inventive device. This problem was solved by the introduction of super-long fiber laser technology, when the entire fiber optic turns into a cavity where the radiation is generated, amplified signal.

Siberian scientists were able to get a stable generation of narrow spectrum - the result is not achieved by any research group in the world. Later, we used the observed effect is to convey information. Scientists have generated an additional stream of photons in the optical fiber of the line, rather than the "outside", which allowed the flow is distributed over the entire length of the fiber and the signal - constantly and evenly amplify just enough to compensate for the loss only.

Today, the distance transmission of information over fiber without repeaters signal trying many laboratories in the world, using a variety of methods - such as using a distributed amplifier using stimulated Raman scattering photon beam.

Uniform amplification of the signal without spikes creates additional noise pulses that cause signal degradation or loss of information.

Source: RIA Sibir

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