photonics
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Researchers build optical transistor out of silicon, provide path to all-optical computing
The speed of light is the universal speed limit, so naturally, optical technologies appeal when trying to construct speedy computational devices. Fiber optics let us shoot data to and fro at top speed, but for the time being our CPUs still make their calculations using electronic transistors. Good news is, researchers from Purdue University have built an optical transistor out of silicon that can propagate logic signals -- meaning it can serve as an optical switch and push enough photons to drive two other transistors. It's constructed of a microring resonator situated next to one optical line that transmits the signal, and a second that heats the microring to change its resonant frequency. The microring then resonates at a specific frequency to interact with the light in the signal line in such a way that its output is drastically reduced and essentially shut off. Presto, an optical transistor is born. Before dreams of superfast photonic computers start dancing in your head, however, just know they won't be showing up anytime soon -- the power consumption of such transistors is far beyond their electronic counterparts due to the energy inefficient lasers that power them.
Optical 'diode' lends hope to photonic computing, rayguns
The trouble with pesky Photon, at least as far as ultra-fast optical computing is concerned, is that he keeps coming back. If a data-carrying beam of light collides with reflections bouncing around between the components of a chip, it can suffer enough interference to make people yearn for the good old days of electrons. What's needed is the optical equivalent of a diode, which only allows light to pass one way, and that's exactly what researchers at Caltech and the University of California claim to have developed. As you'll see in the photo after the break, their metallic-silicon optical waveguide allows light to travel smoothly from left to right, but it breaks up and dissipates any photons traveling in the opposite direction. This is all good, because there's no point having futuristic 50Gbps optical interconnects if our CPUs lag behind. Light up the source link for a fuller explanation.
Scientists produce laser light from human kidney cells, we get in touch with our inner Cyclops
Scientists have just created living laser light out of a human cell and some jellyfish protein, but it's not quite as terrifying as it sounds. Developed by Malte Gather and Seok Hyun Yun at Massachusetts General Hospital, the new technique revolves around something known as green fluorescent protein (GFP) -- a naturally glowing molecule found in jellyfish that can be used to illuminate living material. After genetically engineering a human kidney cell to express this protein, Gather and Yun wedged it between two mirrors in an inch-long cylinder, filled with a GFP solution. Then, they infused the system with blue light, until the cell began to emit its own pulses of bright green laser light. Researchers also noticed that the cell could regenerate any destroyed fluorescent proteins, potentially paving the way for scientists to conduct light-based therapy and medical imaging without an external laser source. Hit the source link for more information, though you'll need a subscription to Nature Photonics to access the full article.
Intel touts 50Gbps interconnect by 2015, will make it work with tablets and smartphones too
Woah there, Mr. Speedy. We've barely caught up with the 10Gbps Thunderbolt interconnect, debuted in the new Macbook Pro, and now Intel's hyperactive researchers are already chattering away about something five times faster. They're promising a new interconnect, ready in four years, that will combine silicon and optical components (a technology called silicon photonics) to pump 50Gbps over distances of up to 100m. That's the sort of speed Intel predicts will be necessary to handle, say, ultra-HD 4k video being streamed between smartphones, tablets, set-top boxes and TVs. Intel insists that poor old Mr. Thunderbolt won't be forced into early retirement, but if we were him we'd be speaking to an employment lawyer right about now.
Intel's 50Gbps Silicon Photonics Link shines a light on future computers (video)
Using copper cables to transfer data around a computer? Get your head out of the sand, Grandpa! Intel thinks that's on the outs and is touting its recent accomplishments with Silicon Photonics and integrated lasers, using light pulses to move data at 50Gbps (last time we heard Intel tout the tech was when it hit 40Gbps speeds in 2007). The emphasis is on low-cost, high-speed fiber optics, the removal of cable clutter, and with the speed boost, the ability to try new system designs by being able to space chips and components farther apart from one another without as much hit on speed -- all theoretical at this point, of course. Researchers hopes to hit terabit per second speeds further down the line. As for John Q. Consumer, enjoy the progress from afar but don't count on seeing this technology hit Newegg anytime soon. Video after the break.
Intel's silicon laser modulator breaks 40Gbps speed barrier
Intel announced today that it has fabricated the first silicon laser modulator to encode optical data at 40Gbps, making it 40 times faster than some of the most sophisticated data networks. The company has been working on silicon-based modulators -- key elements in using lasers as a means of fiber optic data transfer -- for years, creating a 1Gbps version in 2004, and then a 10Gbps iteration in 2006. Intel currently spends thousands producing the modulators now, but it hopes to drive down costs in the near future, allowing for integrated silicon photonic circuits to be built featuring upwards of 25 individual 40Gbps modules, enabling transmissions of terabits of data in seconds. So what does all this scientific doublespeak mean for the hard working computer users of the world? Well let's just say that "stuff" is going to be getting "fast" sooner than you think.[Via WSJ]
