IBM Manufactures Nanophotonics on 90 nm CMOS, Demos 25 GBPS Per Channel
December 10, 2012 12:24 PM
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New processes push technology to the verge of commercialization
International Business Machines, Inc. (
is among the companies
racing to develop nanophotonics
-- on-die light based signaling components -- which can be incorporated directly side-by-side with traditional silicon-based electronics using traditional manufacturing techniques like complementary metal-oxide semiconductor (CMOS).
Currently, signals between components like the processor cores and the memory crawl along as electrons along copper-based wires. In the new scheme
(which create the signal,
often using a ring
), wave-length multiplexers (which route signals),
(which turn signals on or off), and detectors (which receive signals) are baked onto silicon chips connected by fiber optics. Signals then travel at the speed of light along fiber optic channels.
After first demoing the technology in crude proof-of-concept form back in 2010, IBM has returned with the world's smallest announced CMOS-compatible nanophotonics processes. The company
chips this week that were build on a traditional 90 nm CMOS node, a node far smaller than earlier prototypes.
Blue optical wires are shown accelerting the "slow" copper wire (orange) traffic.
IBM says the technology is "primed for commercial development" and will soon be ferrying "terabytes of data between distant parts of computer systems". In a demo IBM showed off 25 gigabytes-per-second (GBps) transfer rates, a speed typically seen in bulky telecommunications fiber-optics equipment, not in PC interconnects, which crawl along at megabytes-per-second (or around 1 Gbps for high-speed PCI-express lanes).
The hope is that the new interconnects will soon pump internal and external communication up to speeds of up to thousands of times the current technology.
Dr. John E. Kelly, Senior Vice President and Director of IBM Research, remarks, "This [latest showcased] technology breakthrough is a result of more than a decade of pioneering research at IBM. This allows us to move silicon nanophotonics technology into a real-world manufacturing environment that will have impact across a range of applications."
The IBM research fellow and SVP will be showing off his work
in a paper
at the IEEE International Electron Devices Meeting (
), which is being held this week in San Francisco, Calif.
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12/10/2012 1:52:18 PM
You are correct that PCIe v3.0 bandwidth is currently ~8Gbps per lane (over copper).
However, this technology is ~25Gbps per transceiver, over fiber. And multiple transceivers can be used on a single fiber. You could conceivably multiplex all 16 "lanes" into a single fiber with this that would have ~3 times the bandwidth, and all the benefits of a single fiber (longer runs, less signal degradation). Of course you could also run multiple fibers. Think 16 fibers running 16 channels, each 3 times as fast as a single PCIe v3.0 lane.
** I used 16 channels as an example that could be multiplexed, but I didn't see a limit from the story. It could be anywhere from 2 to a jillion for all I know.
12/10/2012 3:42:59 PM
At least with current telecom WDM, 16 colors is commonplace, and 256 colors is getting popular.
You're right in that the theoretical limit approaches infinity, since there are an infinite number of color variations in the visible light spectrum, and that doesn't even include infra red or ultra violet combinations.
Of course in practical terms however, it's a matter of diminishing returns, as the more colors you use, higher grades of optical fiber are required that accurately transmit the light without distortion or db loss, and more sensitive transceivers are required to pickup the signal at the other end. At a certain point, it becomes cheaper to just lay another physical cable.
12/10/2012 4:45:01 PM
It doesn't approach infinity; the standard RF bandwidth limitations apply. Of course there is a ton more spectrum available than in the RF range.
12/11/2012 11:53:33 AM
I think the point of this technology is being overlooked. The point is not exactly a cheaper version of the i/o over fiber optic technology we already use. It is replacing the electronic bus connecting one chip with another, for example a memory channel or QPI. More yet, it is about connecting together multiple chips so that they may act almost as if they are a single monolithic chip by making the latency and bandwidth of chip-to-chip links comparable to on-die links.
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