The inventor of the electric lightbulb could not have imagined that one day his creation can be used not simply to illuminate homes worldwide, but also in order to transmit data that may enable people for you to download information by satellites in living space to small hand-held units. However, with the benefits of Li-Fi, household lighting may soon serve as a form of data transmission that’s nearly 100 times quicker than Wi-Fi.
Li-Fi, which was first invented by Harold Hare of the University of Edinburgh in 2011, uses visible light communication (VLC) to transmit data at extremely high speeds. Essentially, this acts as an incredibly fast signal light flashes on and off, to convey messages in binary code (1s and 0s).
In previous laboratory-based experiments, the technology could transfer up to 224 gigabits per second. To put this in perspective, Wi-Fi can reach speeds of around 600 megabits per second.
The technology is now being used in real-life situations for the first time, thanks to the work of the Estonian start-up Velmenni, who has started a trial with Li-Fi in offices and other industrial facilities in Tallinn. In these environments, they were able to achieve connection with a speed of about one gigabit per second.
Apart from the superior speed, Li-Fi also features a number of other advantages over Wi-Fi. For example, the fact that the signal carrier is light means that it cannot pass through walls, this enhances the security of local networks. Of course, this provides a number of limitations as well, because it suggests that the connection will be lost when a user leaves the room, which represents a major obstacle that must be overcome if the technology can be successfully carried out.
However, if this barrier could be surmounted, then using the visible range could allow Li-Fi to help send messages around a much wider range of frequencies than Wi-Fi, which operates between the frequencies of only 2.4 gigahertz and 5 gigahertz.

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