Researchers achieve wireless speed of 2.5 terabits per second2012-06-25 08:52 by DanielaTags: Wireless
American and Israeli researchers have created the fastest wireless network in the world by using twisted, vortex beams to transmit data at 2.5 terabits per second. It is possible that this technique will be used in the next few years to increase the throughput of both wireless and fiber-optic networks. The twisted signals use orbital angular momentum (OAM) to cram much more data into a single stream. In current state-of-the-art transmission protocols (WiFi, LTE, COFDM), we only modulate the spin angular momentum (SAM) of radio waves, not the OAM. The researchers from the University of Southern California, NASA’s Jet Propulsion Laboratory, and Tel Aviv University, twisted together eight ~300Gbps visible light data streams using OAM. Each of the eight beams has a different level of OAM twist. The beams are bundled into two groups of four, which are passed through different polarization filters. One bundle of four is transmitted as a thin stream, while the other four are transmitted around the outside, like a sheathe. The beam is then transmitted over open space (just one meter in this case), and untwisted and processed by the receiving end. Read more -here-
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