Li-Fi rival laser Li-Fi rate is 10 times

Electronic technology applications are still hesitant for the uneven Wi-Fi standards? Li-Fi may be the new technical standard. This kind of optical communication technology uses LED indoor light wave instead of radio wave to transmit data. At present, the top team of Li-Fi research is seeking LED technology for data transmission, which is based on the laser Li-Fi communications technology, in theory, can be based on the LED Li-Fi will speed up more than 10 times. (in fact, as early as a few years ago by China, the United States and Iran branch joint research and development of underwater transmission in the 1m distance wireless rate up to 300Gb/s. The medium is air

The problem is that although LED than incandescent light and lower power consumption, the possibility of LED light output efficiency is still further improved, "visible light communication plan to study one of the members of the mobile communication, University of Edinburgh President HaraldHaas said in parallel. We are convinced that the next generation of high efficiency optical communication will be related to diode laser technology.

Li-Fi modulates the output data by encoding the optical transmission. The naked eye is unable to distinguish the high frequency of flashing light, special receiver installed in the computer and mobile devices to identify the high frequency signal, sometimes also can return the data, run by duplex mode (full duplex can not mention). However, many LED use fluorescent film to convert blue light to white light, which limits the encoding speed of the device and the data transfer rate to some extent.

In a paper published in OpticsExpress, Haas and his team used laser diodes instead of LED to effectively improve the problem. The high efficiency and the light effect of the laser can increase the modulation rate by 10 times (relative to LED). In addition, for the light color conversion, the laser does not need a fluorescent film, which can be directly mixed by a plurality of different wavelengths of laser output, the final formation of white light. This means that the communication link can use multiplexing technology for different wavelengths of light as an independent data path, which can greatly improve the multiplexing of data carried by laser Li-Fi. At present, University of Edinburgh's experimental group uses 9 laser diode.

Currently based on LED Li-Fi communication rate up to 10Gb/s, and Wi-Fi up to 7Gb/s, laser Li-Fi can be increased to more than 100Gb/s.

At present, the cost of laser Li-Fi equipment is still very high, but Haas believes that the final production of industrial production can reduce the cost of laser Li-Fi equipment, and can promote the wide application of the technology. BMW has designed the laser head to his 8 series models. This is just the beginning of the popularity of laser diodes.

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