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5 December 2013 11:26 am ,
Vol. 342 ,
At age 30, Dutch biologist Freek Vonk has built up a respectable career as a snake scientist. But in his home country,...
Since arriving on the island of Guam in the 1940s, the brown tree snake ( Boiga irregularis ) has extirpated native...
An animal rights group known as the Nonhuman Rights Project filed lawsuits in three New York courts this week in an...
Researchers have been hot on the trail of the elusive Denisovans, a type of ancient human known only by their DNA and...
Thousands of scientists in the Russian Academy of Sciences (RAS) are about to lose their jobs as a result of the...
Dyslexia, a learning disability that hinders reading, hasn't been associated with deficits in vision, hearing, or...
Exotic, elusive, and dangerous, snakes have fascinated humankind for millennia. They can be hard to find, yet their...
Researchers have sequenced and analyzed the first two snake genomes, which represent two evolutionary extremes. The...
- 5 December 2013 11:26 am , Vol. 342 , #6163
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Computing at Light Speed
23 January 2007 (All day)
Researchers at Intel have created the fastest-ever silicon-based optical modulator, a device that chops a laser beam into a series of pulses, creating the optical version of digital 1s and 0s. By the middle of the next decade, the new device could help designers create computers in which optical links connect dozens of chips, raising the machines' capabilities to dizzying new heights.
Many computers sold today already sport two or more central processors linked by copper wires that allow them to communicate electronically. Chip companies envision computers with tens to hundreds of processors working side by side. But copper wires can't handle all the electrical signals needed for such an architecture. Optical connections that transmit digital 1s and 0s as streams of light pulses can carry many times the load.
The devices needed to do the job are already in widespread commercial use for long-distance communications. But today they are built from exotic materials that are too costly for personal computers. Intel and other companies have been working to create similar gizmos out of silicon, the industry's standard material for computer chips. In 2004, for example, a team led by Mario Paniccia, an Intel photonics engineer in Santa Clara, California, created a silicon modulator that operates at 1 gigabit per second (Gb/s). In 2005, they pushed the power-hungry unit to 10 Gb/s. To reach higher speeds, Paniccia's group redesigned their modulator to be far more efficient. The new device, which they describe in this week's online version of Optics Express, can switch on and off at a blinding 30 Gb/s.
"This 30 Gb/s modulator makes silicon a real candidate for applications and is a big step forward for silicon photonics," says Graham Reed, an electrical engineer at the University of Surrey in the U.K. Paniccia says that relatively minor tweaks should allow his group to boost the speed of their modulator to 40 Gb/s. If so, he says, in about 10 years, engineers will be able to integrate the modulator with other devices to make optical links between nearby chips that can transfer a blistering trillion bits of data every second.