VisibleLight
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Researchers beat fiber optic broadband speeds using visible LED light
High speed data is already being transmitted by visible light to the moon, so why not in your living room, too? After the Fraunhofer Institute showed off 3Gbps speeds with LED lights, researchers from five UK universities have managed to transmit data at 10Gbps using micro-LEDs with a technique they've coined "LiFi." The team was able to crack the barrier by combining 3.5Gbps streams in each of the red, green and blue frequencies that make up white light. Such a technique could one day work with existing light bulbs, promising higher speeds than current WiFi and increased security -- since visible light can't penetrate solid objects like walls. In addition, a single bulb could theoretically provide connectivity for up to four devices. For now, such devices are confined to the lab, but given the torrid pace of development, don't be surprised if your data connection is soon a click of the switch away.
Harvard makes distortion-free lens from gold and silicon, aims for the perfect image (or signal)
Imaging has been defined by glass lenses for centuries, and even fiber optics haven't entirely escaped the material's clutch. Harvard's School of Engineering and Applied Sciences might have just found a way to buck those old (and not-so-old) traditions. A new 60-nanometer thick silicon lens, layered with legions of gold nanoantennas, can catch and refocus light without the distortion or other artifacts that come with having to use the thick, curved pieces of glass we're used to -- it's so accurate that it nearly challenges the laws of diffraction. The lens isn't trapped to bending one slice of the light spectrum, either. It can range from near-infrared to terahertz ranges, suiting it both to photography and to shuttling data. We don't know what obstacles might be in the way to production, which leads us to think that we won't be finding a gold-and-silicon lens attached to a camera or inside a network connection anytime soon. If the technology holds up under scrutiny, though, it could ultimately spare us from the big, complicated optics we often need to get just the right shot.
University of Twente's new lens reveals the sub-100nm level with visible light
Small is beautiful, but only when you can see it. Specifically, we're talking about nanostructures -- including cellular organelles and nanoelectronic circuits -- around the order of 100nm. The problem is with a microscope, visible light only takes us down to a resolution of 200nm at best, and it's not always ideal to use conventional methods to boost the resolution -- you'd either have to dope the subject with fluorescent dye or use highly delicate equipment. Thankfully, the University of Twente has come up with a new type of lens that would solve this problem: in a nutshell, a nanoparticle is placed on one side of the gallium phosphide lens, while the other side -- disorderedly etched with acid -- takes in a precisely modulated laser beam and scatters it into a focal point of your choice. Sure, this sounds bizarre and ironic, but apparently the modulation is controlled in such a way that the scattered beam focuses much tighter than an ordinary beam would using an ordinary lens. Have a look at the comparison shots of some gold nanoparticles after the break -- that's some sweet 97nm resolution right there for ya.
LVX System launches visible light communication in the US, finally
Ever wonder what happened to LEDs as a WiFi alternative? Well, wonder no more, because visible light communication is here -- in the municipal offices of St. Cloud Minnesota, at least. Starting tomorrow, LVX System, a Minnesota start-up, is installing the first of a series of LED fixtures that will use flashing lights to connect office workers to the internet, while saving big on the electric bill. The fixtures also function as regular overhead lights, using 36 watts of energy where 100 watts were once necessary. The setup consists of clusters of LEDs that switch on and off thousands of times per second at intervals undetectable to the human eye. The flashes emit binary code data -- off equals zero and on equals one -- that is received by special patented modems. Lights on these modems then transmit data back to the fixtures, and voila, you've got internet. According to LVX, light-powered networks are far less crowded and far more secure than their predecessors. Unfortunately, LVX's current incarnation transmits data at about 3Mbps -- a mere pittance compared to standard WiFi or Ethernet. Then again, 3Mbps is certainly fast enough for a city employee to perform really important tasks like keeping track of their favorite gadget blog, so we'll take it. [Thanks, Andrew]
UC-Light project puts LEDs to work in communication networks
Yeah, mad scientists have been trying to get the public at large to pay attention to visible light communications for years now, but the gurus over at the University of California, Riverside think that the project they're involved in holds a special kind of promise. The Center for Ubiquitous Communication by Light (UC-Light) will be funded with $3.5 million from the Multicampus Research Program and Initiatives (MRPI) competition within the University of California system, and at its core, it's hoping to unearth a magical method for linking up all sorts of electronics (HDTVs, PDAs, information kiosks, PCs, etc.) via light. You know, so your refrigerator can tell your smartphone what groceries are needed during the next supermarket stop, and that massive billboard on I-95 can beam more information that you don't want right onto your handset. If all goes to plan (and California's budget problem solves itself), the work will begin in early 2010 and last five years, after which we fully anticipate "very low-cost communication and navigation systems [to be built] on existing lighting infrastructure." And fowl in every pot. And unicorns in every garage.[Thanks, Michael]
Fuji Television demonstrates visible light communications system
It's not like visible light communications is the new kid on the block or anything, but Fuji Television was busy showcasing a new flavor of the technology at Inter BEE 2007 that could assist deaf / hearing impaired individuals when watching TV. In the demonstration, a LED-backlit LCD TV displayed content while simultaneously beaming out information sans wires to a nearby PDA; the handheld was able to receive the textual data and display words to accompany the on-screen action. Not surprisingly, the communications system was developed by NEC, and it even supported selective distribution in order to transmit the correct information to the appropriate individual. No mention was made of an expected commercialization date, but feel free to check out a couple more shots of the setup after the break.
Matsushita demonstrates data beaming with visible light
Infrared hasn't exactly taken the wireless data transfer world by storm, and while it seems to still flank the sides of modern smartphones and the occasional laptop, we can't exactly recall the last time we found it particularly useful in a public setting. Matsushita is out to solve the data beaming quandary, and it's looking to add a little light to the situation all the while with a visible twist. The technology allows data to be beamed from transmitter to receiver via visible light, and aside from purportedly streaming information along at "optical fiber speeds," it can also pull double duty as an indoor lighting source if you're short on lamps. The firm is hoping to get the standard ratified soon, and ideally, would like to see kiosks set up to beam information onto consumer / client receivers by just walking up to the light source, pairing up their device, and walking away happy. Additionally, this system could have a leg up on other wireless alternatives in sensitive areas such as hospitals, as the Visible Light Communications (VLC) creation won't interfere with pulse-makers and other medical equipment. Now, how long before this stuff hits the handset market?[Via Gearfuse]
