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a) Cleaved coupling section of a bent waveguide bus and a resonator; b&c) Delay line consisting of several ring resonators
Researchers have effectively delayed light's travel for the purpose of chips

IBM has announced that its researchers have built a device capable of delaying the flow of light on a silicon chip, which could lead the further development of using light instead of electricity to transfer data. Researchers have known that the use of optical instead of electrical signals for transferring data within a computer chip might result in significant performance enhancements since light signals can carry more information faster. The engineering challenge is buffering data on the chip, which is difficult given light’s speed. Thus, a means of using light effectively is to delay its travel.

Long delays can be achieved by passing light through optical fibers. IBM scientists were able to delay light by passing it through a new form of silicon-based optical delay line built of up to 100 cascaded "micro-ring resonators," built using current silicon complementary metal-oxide-semiconductor (CMOS) fabrication tools. When the optical waveguide is curved to form a ring, light is forced to circle multiple times, delaying its travel. The optical buffer device based on this simple concept can briefly store 10 bits of optical information within an area of 0.03 square millimeters. This advancement could potentially lead to integrating hundreds of these devices on one computer chip, an important step towards on-chip optical communications.

"Today's more powerful microprocessors are capable of performing much more work if we can only find a way to increase the flow of information within a computer," said Dr. T.C. Chen, vice president of Science and Technology for IBM Research. "As more and more data is capable of being processed on a chip, we believe optical communications is the way to eliminate these bottlenecks. As a result, the focus in high-performance computing is shifting from improvements in computation to those in communication within the system."

The report on this work, "Ultra-compact optical buffers on a silicon chip," is published in the premiere issue of the journal Nature Photonics. This work was partially supported by the Defense Advanced Research Projects Agency (DARPA) through the Defense Sciences Office program "Slowing, Storing and Processing Light."

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Human Beings are entering the Light Era
By Senju on 12/27/2006 7:11:39 PM , Rating: 5
Look at the last breakthroughs in the last year; Bending light, controlling the density, controlling the speed and direction. We are entering a new era from electronic to light control systems. We will not see the effects tomorrow but exciting new applications will come to the market in the next ten years and will change our lives even more than we can imagine. I think I will record this entry and read it ten years from now... :D

RE: Human Beings are entering the Light Era
By Sharky974 on 12/27/2006 9:53:16 PM , Rating: 1
Yeah sure. None of that works and you can pretty much always count on science to fail.

I thought we were supposed to have the common cold (let alone much worse diseases) cured by now too. That's what the papers told me..

By evildorf on 12/27/2006 11:32:54 PM , Rating: 4
"...and you can pretty much always count on science to fail."

Yes, that makes perfect sense. I look through history, and all I see is science failing. This whole Internet thing? Created in a day by a series of happy coincidences. Good thing science didn't have anything to do with it. Might have mucked it up.

By zsdersw on 12/28/2006 9:47:55 AM , Rating: 2
Yeah sure. None of that works and you can pretty much always count on science to fail.

You're either a complete idiot.. or you were being sarcastic/facetious.

To everyone else: Any bets on which it is?

By gibletsqueezer on 12/29/2006 5:42:09 AM , Rating: 2
the "common cold" is not a disease you moron. Stop listening to papers and read something

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