Reprints from my posting to SAN-Tech Mailing List and ...


[san-tech][02613] IBM light-powered link研究紹介, SEPTEMBER 2010, IEEE Spectrum

Date: Thu, 09 Sep 2010 22:01:00 +0900

"Get on the Optical Bus"
 IBM's light-powered links overcome the greatest speed bump in
 supercomputing: interconnect bandwidth
 IBM T. J. Watson Research Center in Yorktown Heights
 SEPTEMBER 2010, IEEE Spectrum


  "At IBM, we have now developed a first-of-its-kind optical data-transfer
   system, or bus, built right onto the circuit board. With it, we will
   soon unveil computer systems 100 times as fast as anything available

Anatomy of An Optomodule (解説図)

  "We are developing parallel optical devices that will soon have the
   kind of speed, density, and cost profile we are seeking. We call them
   optochips. Optochips are transceivers: They convert signals from
   electrical to optical form and back again."

  "We have built two quite different optochips, one operating on optical
   signals at 985 nanometers and the other at 850 nm. They both use
   vertical-cavity surface-emitting lasers (VCSELs) as the light source.
   These lasers can be modulated at speeds of up to 40 Gb/s, and they emit
   light vertically through mirrors, along a path perpendicular to the chip.
   The lasers are particularly inexpensive to manufacture, in part because
   they are fabricated in two-dimensional arrays and so can be tested right
   on the wafer, before it has gone through further processing steps.
   (VCSELs are so inexpensive - just pennies per device?that they're now
   found in nearly all optical mice.)"


  "Within five years, we hope to connect microprocessors and memory chips
   right to the optochip, producing the optical analogue to the electrical
   multichip modules in today's big-iron machines. In these near-future
   supercomputers, electrical connections will supply only the power, the
   ground, and the control signals. All the data will shoot through optical
   interconnects at the speed of light."

About the Author
  "Their mission is not to speed up processors but to deal with the
   shortage of bandwidth between them - an irksome problem that must be
   solved if future generations of supercomputers and servers are to be
   more powerful than today's."

"Optical PCB Overview",
 Printed circuit board symposium, IBM Research, November 2009$file/ibm+opcb+roadmap+and+tech+-+jeff+kash.pdf

Printed circuit board symposium, November 18 and 19, 2009

  "The theme of this worldwide conference was high speed, high bandwidth
   challenges for future technologies. The meeting brought together key
   PCB and interconnect?related suppliers, along with IBM employees
   representing development, research, and the integrated supply chain.
   Eleven countries and twenty-six suppliers were represented at this
   two-day event."



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