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Li-Fi Technology Could Provide Fast, Cheap and Energy-Efficient Internet Via LED Bulbs


_70561189_hi019302373Reading about new energy efficient technologies that can transform the world to a cleaner and greener place, with a lot less emissions and minimal air pollution, can never be tiresome and uninteresting.

Probably this is one of the main reasons why scientists continue exploring and developing techniques and gadgets that can rely less on fossil fuel generated electricity, while still fulfilling our user needs and improving our high-tech experience. Along these lines, scientists at Fudan University, Shanghai, worked day and night to bring the highly anticipated wi-fi connectivity from a light bulb, a.k.a. li-fi, much closer to its implementation. Here are the details.

Li-fi is a technology that has been in a process of development for quite some time now. The reason why it is so attractive is the unlimited capacity of visible light, which is thousands of times bigger than the radio signal, currently used in wi-fi. It holds the potential to be much more energy efficient and way cheaper, solely because of the nature of LED bulbs, and the fact that the infrastructure, which supports them, is already in place.

According to Chi Nan, a professor at Fudan University and leader in the study, one microchipped LED bulb can generate data speed of as much as 150 megabits per second. In addition, a standard one-watt LED bulb should be able to provide net connectivity to four standard working computers. If this is really true, it means that such li-fi will be much better than any of the currently available broadband connections in China.

As great as li-fi technology might be, there is one main limitation, which somehow cannot be left unmentioned. The transmission of the signal relies on visible light, which cannot pass through walls. This means that if the light is blocked, the internet signal is gone. Of course, supporters of the technology argue that this can only mean a “good-bye” to all these drive-by hackings of wireless internet.

However, this great achievement by the Chinese team, surprised quite a number of experts in the field, including the inventors of the idea- Prof Harald Haas, from University if Edinburgh, and a CEO of PureVLC. The reason for this is that apparently the Chinese team has not provided the needed evidence or demonstration, required to convince the developers at PureVLC, who, since 2011, have had one and only aim- to improve and realize the li-fi technology.

In her defense, professor Chi emphasized on the fact that the technology is still being tested, and some developments are needed on microchip design and optical communication levels. The professor and her team are hoping to be demonstrating the fully functioning li-fi system on 5th of November in Shanghai during the China International Industry Fair.

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  1. sir
    i just got a 3 watts solar panel to be used as a photodetector, three 6 watts LED LiFi panel bulbs,and fresnel lens for an amplifier
    please is this enough for a room LiFi
    i realy want to know if the fresnel lens is a must since its in a room because its hard to get fresnel lenses in nigeria
    help i need implemention and detail lessons on the digital creation of LiFi internet. Not the analogue

  2. sir
    i need some help on the lifi solar internet set up
    using the solar panel of say 3 watts as photodetector and fresnel lens as concentrator or as transimpedance power amplifier circuit,LED lamps 3watts say 2lamps
    i want to know if these will be ok for the set up and plus i need help on the configuration in a windows operating system
    moreso i love to know if routers and modems have transimpedance power amplifier circuit if not what devices have this circuit are they integrated with the photodetector?


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