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Your position:Home > News > Industry News > Laser Lifi

Laser Lifi

  • Author:abby
  • Source:net
  • Release on :2015-10-16
    We are still spotty Wi-Fi standard hesitation? Li-Fi may be new technical standards. Such optical communication technology-based LED indoor radio waves instead of light waves for data transmission. The current top team Li-Fi studies are looking beyond the LED technology for data transmission, which is laser-based Li-Fi communication technologies, in theory, can enhance more than 10 times in Li-Fi base rate will be the LED. (In fact, as early as a few years ago by the country Branch, jointly developed by the United States and Iran will be able to 1m underwater transmission distance wireless speeds of up to 300Gb / s. Media is now using air.) 
     The current problem is that, although lower than the incandescent light power LED, LED light output efficiency is still the possibility of further improvement, "the President of the University of Edinburgh mobile communications, parallel study of visible light communication plan HaraldHaas member said. We are convinced that , energy-efficient next-generation optical communications laser diode will be related technologies.
    Li-Fi by modulating output data, encoded by light transmission. Naked eye is unable to distinguish such high-frequency flashing light, special receivers installed on computers and mobile devices can recognize this high-frequency signal, sometimes also can return data in duplex mode run (whether full Duplex did not mention). However, many of the blue LED using the fluorescent film is converted to white light, which limits the rate of the encoding device to some extent, and the data transfer rate.
     In "OpticsExpress" paper published, Haas and his team instead of a laser diode LED can effectively improve the above problems. Energy efficiency and light effect laser enables coding and modulation rates up to 10 times (relative LED). Also for the light color conversion, laser without fluorescent film, it can be directly obtained by mixing a plurality of different wavelengths of laser output, and ultimately the formation of white. This means that the communication link can be used for multiplexing different wavelengths of light as independent data paths, this light reuse can greatly improve the laser Li-Fi data carried. Experimental University of Edinburgh team now employs 9 path of the laser diode.
Currently Li-Fi communication rate up based LED 10Gb / s, while Wi-Fi up 7Gb / s, laser Li-Fi can be raised to a rate exceeding 100Gb / s.
    At the moment, realize laser Li-Fi equipment cost is still very high, but Haas believes industrialized production ultimately reduce the cost of laser equipment Li-Fi, and can promote the wider use of the technology. BMW has a laser headlight design to his 8-based models. This is only the beginning of the laser diode popularity.