Posted on 12/06/2007 1:03:40 PM PST by Ernest_at_the_Beach
IBM scientists have announced a breakthrough that could lead to a new generation of supercomputers that squeeze the processing power of today's giants into the form factor of a laptop. The research is based on the use of a light pulses sent through silicon instead of electrical signals on wires which make up conventional computer chips and also promises incredibly energy efficient processors that would expend only the energy of a light bulb to achieve what current supercomputers do with enough power to run hundreds of homes.
The paper, published in the journal Optics Express, concerns the silicon Mach-Zehnder electro-optic modulator - a device which converts electrical signals into pulses of light and promises to significantly reduce cost, energy and heat while increasing communications bandwidth between the cores by a factor of more than 100 over wired chips. The new modulator, which according to IBM is 100 to 1,000 times smaller in size compared to previously demonstrated devices of its kind, acts as a very fast “shutter” to modulate the intensity of the input laser beam and converts a stream of digital bits (“1”s and “0”s) from electrical signals into light pulses.
“Work is underway within IBM and in the industry to pack many more computing cores on a single chip, but today’s on-chip communications technology would overheat and be far too slow to handle that increase in workload,” said Dr. T.C. Chen, vice president, Science and Technology, IBM Research. “What we have done is a significant step toward building a vastly smaller and more power-efficient way to connect those cores, in a way that nobody has done before.”
IBM explain the potential of the technology in terms of the current processor which powers the Sony Playstation 3 - while this contains nine cores on a single chip, the new technology aims to connect hundreds or thousands of cores together on a tiny chip by eliminating the wires required to connect them.
“We believe this is a major advancement in the field of on-chip silicon nanophotonics,” said Dr. Will Green, the lead IBM scientist on the project. “Just like fiber optic networks have enabled the rapid expansion of the Internet by enabling users to exchange huge amounts of data from anywhere in the world, IBM’s technology is bringing similar capabilities to the computer chip.”
The report on this work, entitled “Ultra-compact, low RF power, 10 Gb/s silicon Mach-Zehnder modulator” by William M. J. Green, Michael J. Rooks, Lidija Sekaric, and Yurii A. Vlasov of IBM’s T.J.WatsonResearch Center in Yorktown Heights, N.Y. is published in Volume 15 of the journal Optics Express and was supported by the Defense Advanced Research Projects Agency (DARPA) through the Defense Sciences Office program “Slowing, Storing and Processing Light”.
fyi
Note to self.... Buy IBM stock tomorrow.
Thursday, 6 December 2007, 11:16 GMT
Scientists at IBM have completed work that may make it possible to do away with the copper wires used to couple processing cores to each other. The connector created by the team uses light to pass data between the computational cores that is faster and uses less power than copper wires. The device is smaller than previously demonstrated connectors promising to shrink future computational clusters. The IBM development, reported in the journal Optics Express, could replace the copper wires that connect cores with a device that converts electrical signals to pulses of light. The device, called a silicon Mach-Zehnder electro-optic modulator, is many times smaller than previously produced convertors. "What we have done is a significant step toward building a vastly smaller and more power-efficient way to connect those cores, in a way nobody has done before," said Dr Tze-chiang Chen, a spokesman for IBM's science and technology research division. It could also boost the power of coupled computational cores because by using light, the speed at which data travels between the cores would be accelerated. With light the researchers, led by Dr Will Green, can cut the amount of power needed to move data between processors and slash the amount of heat a large computational cluster produces. The technology, which can transfer data up to a distance of a few centimetres, is about 100 times faster than wires and consumes one-tenth as much power, said Dr Green. The lower power requirement should reduce operational costs for supercomputers. Doing away with some of the cooling systems for computational clusters could shrink the systems further. So far the team has only demonstrated the technology in a lab and it could be years before it makes its way into commercial chips. |
Supercomputers that consist of thousands of individual processor "brains" connected by miles of copper wires could one day fit into a laptop PC, thanks in part to a breakthrough by IBM scientists announced. And while today's supercomputers can use the equivalent energy required to power hundreds of homes, these future tiny supercomputers-on-a-chip would expend the energy of a light bulb. In a paper published in the journal Optics Express, the IBM researchers detailed a significant milestone in the quest to send information between multiple cores — or "brains" — on a chip using pulses of light through silicon, instead of electrical signals on wires.
The breakthrough — known in the industry as a silicon Mach-Zehnder electro-optic modulator — performs the function of converting electrical signals into pulses of light. The IBM modulator is 100 to 1,000 times smaller in size compared to previously demonstrated modulators of its kind, paving the way for many such devices and eventually complete optical routing networks to be integrated onto a single chip. This could significantly reduce cost, energy and heat while increasing communications bandwidth between the cores more than a hundred times over wired chips.
"Work is underway within IBM and in the industry to pack many more computing cores on a single chip, but today's on-chip communications technology would overheat and be far too slow to handle that increase in workload," said Dr. T.C. Chen, vice president, Science and Technology, IBM Research. "What we have done is a significant step toward building a vastly smaller and more power-efficient way to connect those cores, in a way that nobody has done before."
Today, one of the most advanced chips in the world — IBM's Cell processor which powers the Sony Playstation 3 — contains nine cores on a single chip. The new technology aims to enable a power-efficient method to connect hundreds or thousands of cores together on a tiny chip by eliminating the wires required to connect them. Using light instead of wires to send information between the cores can be 100 times faster and use 10 times less power than wires.
"We believe this is a major advancement in the field of on-chip silicon nanophotonics," said Dr. Will Green, the lead IBM scientist on the project. "Just like fiber optic networks have enabled the rapid expansion of the Internet by enabling users to exchange huge amounts of data from anywhere in the world, IBM's technology is bringing similar capabilities to the computer chip."
IBM's optical modulator performs the function of converting a digital electrical signal carried on a wire, into a series of light pulses, carried on a silicon nanophotonic waveguide. First, an input laser beam is delivered to the optical modulator, which acts as a very fast "shutter" which controls whether the input laser is blocked or transmitted to the output waveguide. When a digital electrical pulse arrives from a computer core to the modulator, a short pulse of light is allowed to pass through at the optical output. In this way, the device "modulates" the intensity of the input laser beam, and the modulator converts a stream of digital bits ("1"s and "0"s) from electrical signals into light pulses.
The report on this work, entitled "Ultra-compact, low RF power, 10 Gb/s silicon Mach-Zehnder modulator" by William M. J. Green, Michael J. Rooks, Lidija Sekaric, and Yurii A. Vlasov of IBM's T.J.WatsonResearch Center in Yorktown Heights, N.Y. is published in Volume 15 of the journal Optics Express. This work was partially supported by the Defense Advanced Research Projects Agency (DARPA) through the Defense Sciences Office program "Slowing, Storing and Processing Light".
IBM's Chip Innovation Leadership
Today's announcement by IBM bookends a decade of innovation from IBM Labs that have transformed the IT industry with new materials and design architectures to build smaller, more powerful and energy efficient chips. IBM's pioneering work to move the industry from aluminum to copper wiring, unveiled in 1997, gave the industry an immediate 35 percent reduction in electron flow resistance and a 15 percent boost in chip performance. Since then, IBM scientists have continued to drive performance improvements to continue the path of Moore's Law. And in 2007 alone, IBM announced:
High-k metal gates (January 2007) - A solution to one of the industry's most vexing problems — transistors that leak current. By using new materials IBM will create chips with "high-k metal gates" that will enable products with better performance that are both smaller and more power efficient.
eDRAM (February 2007) - By replacing SRAM with an innovative new type of speedy DRAM on a microprocessor chip, IBM will be able to more than triple the amount of embedded memory and boost performance significantly.
3-D Chip Stacking (April 2007) - IBM announces the creation of three-dimensional chips using "through-silicon vias," allowing semiconductors to be stacked vertically instead of being placed near each other horizontally. This cuts the length of critical circuit pathways by up to 1,000 times.
Airgap (May 2007) - Using a "self assembly" nanotechnology IBM has created a vacuum between the miles of wire inside a Power Architecture microprocessor reducing unwanted capacitance and improving both performance and power efficiency.
Mmore information: IBM Silicon Photonics project
Hey, didn't he used to post here?
I wonder if there are limitations on the topology of the connections? It sounds like the distance for the present implementation is limited to a few cm's, but I suppose that could be expanded if needed.
Se link at post # 6 for a YouTube illustration....IBM supplied.....no less.
See the You Tube video at link above...post #6.
BUMP!
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