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Researchers generate high-speed pulses of laser light on silicon, speeding data transmission
August 22, 2007In the Sept. 3 issue of Optical Society of America's Optics Express, published online today, researchers announce that they have built the world's first "mode-locked silicon evanescent laser." Mode-locked evanescent lasers can deliver stable short pulses of laser light that are useful for many optical applications, including high-speed data transmission, multiple wavelength generation, remote sensing (LIDAR) and highly accurate optical clocks. This new work is a significant step toward the goal of combining lasers and other key optical components on silicon, providing a way to integrate optical and electronic functions on a single chip and enabling new types of integrated circuits. It introduces a more practical technology with lower cost, lower power consumption and more compact devices.
Summary
Present-day computer technology depends on weak electrical currents for data communication within the silicon-based microprocessor. By causing silicon to emit light and exhibit other potentially useful optical properties, integration of photonic devices on silicon becomes possible. The problem in the past - it is extremely difficult, nearly impossible, to create a laser in silicon.
Less than one year ago, a research team led by John Bowers at the University of California, Santa Barbara and Intel successfully created laser light from electrical current on silicon by placing a layer of indium phosphide (InP), an important technology in high-speed communication, above the silicon. In this new study, electrically-pumped lasers emitting 40 billion pulses of light per second were demonstrated, built on the hybrid silicon platform developed the year prior. This is the first-ever achievement of such a rate in silicon and one that matches the rates produced by other media in standard use today. These short pulses are composed of many evenly spaced colors of laser light, which could be separated and each used to transmit different high-speed information, replacing the need for hundreds of lasers with just one.
Creating optical components in silicon will lead to optoelectronic devices that can increase the amount and speed of data transmission in computer chips while using existing silicon technology. Employing existing silicon technology is a desirable goal because it would represent a potentially less expensive and easier-to-implement way of mass-producing future-generation devices that use both electrons and photons to process information, rather than just electrons as has been the case in the past. This advance was made possible by funds from the Microsystems Technology Office of the Defense Advanced Research Projects Agency (DARPA) at the United States Department of Defense.
Optical Society of America
Creating optical components in silicon will lead to optoelectronic devices that can increase the amount and speed of data transmission in computer chips while using existing silicon technology. Employing existing silicon technology is a desirable goal because it would represent a potentially less expensive and easier-to-implement way of mass-producing future-generation devices that use both electrons and photons to process information, rather than just electrons as has been the case in the past. This advance was made possible by funds from the Microsystems Technology Office of the Defense Advanced Research Projects Agency (DARPA) at the United States Department of Defense.
Optical Society of America
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Plenum rated cable generally has the same data transmission performance specifications as regular CAT5e, but there are some differences in the wire pair coating, and the outer jacket of the cable itse by Ultralink Plenum rated cable generally has the same data transmission performance specifications as regular cat5e but there are some differences in the wire pair coating and the outer jacket of the cable itself. plenum rated cat5e cable has a jacket that meets specific ansi requirements to be flame retardant and have low smoke production. The idea being that if the building is involved in a fire the cat5e plenum cable will not burn as easy as a standard pvc jacket and will produce less smoke than a typical cat5e cable if it does catch fire. The only drawback to this theory has to do with the fact that if plenum rated cat5e cable actually does catch fire it has been reported that it can actually burn at hotter temperatures than a pvc jacketed cat5e cable. deciding if you need plenum typically will... | |
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