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'Time telescope' could boost up long-distance communications.

Byline: ANI

Washington, September 29 (ANI): If scientists have their way, then a "telescope" that can magnify mag·ni·fy
To increase the apparent size of, especially with a lens.
 time could soon dramatically increase the amount of data that can be sent through fibre optic cables, speeding up broadband internet See broadband.  and other long-distance communications.

Though it isn't possible to speed up the flashes of light that stream through the global network of optical fibres at around 200 million metres per second, more information can be squeezed into each burst of light, according to according to
1. As stated or indicated by; on the authority of: according to historians.

2. In keeping with: according to instructions.

 Mark Foster at Cornell University Cornell University, mainly at Ithaca, N.Y.; with land-grant, state, and private support; coeducational; chartered 1865, opened 1868. It was named for Ezra Cornell, who donated $500,000 and a tract of land. With the help of state senator Andrew D.  in Ithaca, New York
This article is about the City of Ithaca and the region. For the legally distinct town which itself is a part of the Ithaca metropolitan area, see Ithaca (town), New York.

For other places or objects named Ithaca, see Ithaca (disambiguation).
, using what he and his colleague Alexander Gaeta call a "time telescope" fitted with "time lenses".

"A time lens is essentially like an optical lens," said Foster.

An optical lens can deflect a light beam into a much smaller area of space; a time lens deflects a section of a light beam into a smaller chunk of time.

The Cornell team made their time lenses using a silicon waveguide waveguide, device that controls the propagation of an electromagnetic wave so that the wave is forced to follow a path defined by the physical structure of the guide.  that can channel light.

An information-carrying pulse made from a series of small laser bursts signalling digital 1s and 0s travels through an optical fibre and into the waveguide.

As it enters, it is combined with another laser pulse from an infrared laser.

The infrared pulse vibrates the atoms of the waveguide, which in turn shifts the frequencies of the data-carrying pulse before it exits the waveguide and passes into an optical fibre beyond.

"The front of the (data-carrying) pulse is shifted down in frequency and the end is shifted up in frequency within the silicon waveguide," said Foster.

Because the speed of light passing through a medium depends on its frequency, the front of the pulse is slowed down while its rear speeds up.

At the time lens's focal point focal point
See focus.
, the rear of the pulse catches up with the front, producing a fleeting image with a spectrum encoding the entire light pulse.

The Cornell team compressed a light pulse carrying 24 bits of data in this way.

They used a second time lens to convert the compressed image back into a 24-bit light pulse like the one they started with.

The second lens was more powerful than the first, however, so the second 24-bit pulse was 1/27th the length of the one that went in: the pulse duration In radar, measurement of pulse transmission time in microseconds; that is, the time the radar's transmitter is energized during each cycle. Also called pulse length and pulse width.  shrank from 2.5 nanoseconds to 92 picoseconds, but no information was lost.

The two lenses work together like the two lenses of a simple telescope or microscope.

A similar device could be used to compress the data passing through the packet-based optical networks that underlie global communications, according to Foster.

"We would be able to send 27 times as much information on the ame wavelength channel," he said. (ANI)

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Publication:Asian News International
Date:Sep 29, 2009
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