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any1
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re: Luxtera, ST in deal to take silicon photonics mainstream
any1   3/5/2012 9:44:07 PM
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I believe that Intel was successful in making Light Peak work from a technical standpoint - just not as cheaply as they could implement Thunderbolt. And I guess their customers (Apple?) decided that Thunderbolt was good enough for now. Perhaps Light Peak will supplant Thunderbolt in the next generation interface in another few years.

krisi
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re: Luxtera, ST in deal to take silicon photonics mainstream
krisi   3/5/2012 2:40:53 PM
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Good point @resistion...E-O-E conversion will be always required...if you have to send 10 Gb/s over 1km the power dissipation of the photonic solution is lower, at 100m comparable and at 10m higher than that of the purely electronic one...so there is ways to go before that technology can be used at the chip level...but right now there are many repeaters and clock trees that are used on-chip that could be displaced with something arguably simpler in the future, optical clock tree will be very simple...Kris

resistion
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re: Luxtera, ST in deal to take silicon photonics mainstream
resistion   3/5/2012 12:54:21 AM
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Wonder about power dissipation as well. There is still a conversion to electrons involved, which will not be ideally efficient.

david.may
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re: Luxtera, ST in deal to take silicon photonics mainstream
david.may   3/4/2012 11:01:29 AM
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theres so much to say on this nano photonics subject it fascinates me :) but its hard to cut through the crud and pull out the gems in general reporting not least when we will actually see a group of products you can buy and play with. i prefer to look at the core device or process they are describing and think how one might put that and related findings to practical use to make an exact copy of what's already available in the normal scale only nano scale in this case. i dont want to see this simply as "smarter wire" or so different that people think it needs a totally different wat of doing things, for instance the "omparing light wavelength with MOSFET channel size" im not quite sure what that means but this pic overcomes that i think ? http://www.spxdaily.com/images-lg/optically-connected-topology-hyperx-lg.jpg see http://www.spacemart.com/nanotech.html for many other things they can do and how you might use them to make a 3d stacked SOC etc "Nano-coating doubles rate of heat transfer" seems obvious,out that and a nano thermoelectric generator in layers to both cool and reclaim power to supplement local power nano ram. "weld nanowires with light" and lots more http://www.nanodaily.com/ "Metal nanoparticles shine with customizable color" for laser. "Light-emitting nanocrystal diodes go ultraviolet" i think in interesting as the wavelengths of 1310-nm, 1490-nm and 1550-nm above imply they are ONLY thinking generic Wavelengths Fiber Optics in the infrared range over glass not the lower UV range Plastic optical fiber (POF)at 650 nm. http://www.thefoa.org/tech/wavelength.htm odd in so far as nano plastics and so called bio chips are available today, so its perfectly possible to combine these and the other nano processes into one assembly and see the damn things ASAP LOL, did i say there's lots to say :)

krisi
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re: Luxtera, ST in deal to take silicon photonics mainstream
krisi   3/2/2012 7:34:23 PM
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I guess we were on different pages @me...I am slowly understanding what you are saying...you are comparing light wavelength with MOSFET channel size...yes, photon is larger in that sense, and it leads to a statement that photonic devices will be probably always larger then electronic one...so yes photodiode on silicon will be always larger than transistor...but the signal from laser or modulator going to a photodiode will be send much faster than from transistor to transistor (if they are far away enough) and that is a main point of photonic interconnects on chip...Kris

me3
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re: Luxtera, ST in deal to take silicon photonics mainstream
me3   3/2/2012 7:02:10 PM
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What I mean is if you divide 1400nm by the silicon refractive index you get about 400nm. You need to half that much space 200nm to form one channel, compared 28nm, 20nm, 14nm for electrons. QED??

krisi
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re: Luxtera, ST in deal to take silicon photonics mainstream
krisi   3/2/2012 5:53:00 PM
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I am pretty sure that photon is smaller than silicon chip @me (assuming you can isolate one and measure how large it is which is rather impossible according to quantum physics)....but putting size deliberations aside the discussion should be around a point "how long the interconnect has to be in order for optical transmission to make sense?"...that number used to be several km (long haul optical fibers) and it is now several cm (optical back-planes)...so likely it will become several mm in the future at which point application on chips might make sense...Kris

me3
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re: Luxtera, ST in deal to take silicon photonics mainstream
me3   3/2/2012 5:16:48 PM
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Photons are too big compared to the chip scale. They are very hard to put in and take out from the chip. The technology is cool but no future.

resistion
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re: Luxtera, ST in deal to take silicon photonics mainstream
resistion   3/2/2012 4:53:05 PM
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That reminds, did Intel give this up yet? Light Peak was hot topic at one point.

krisi
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re: Luxtera, ST in deal to take silicon photonics mainstream
krisi   3/2/2012 4:51:25 PM
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I believe that Intel continues to invest heavily in this technology, this is the future, photons are faster than electrons...the only debate is when it will be deployed commercially not whether it will be deployed...Kris

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