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"LI-FI" an advancement in the communication technology.

LI-FI also called as light fidelity is going to change the way of communication drastically.


First of all you should know that what is li-fi.It is defined as the light fidility.

HOW IT WORKS:

Visible light communications (VLC) works by switching the current to the LEDs off and on at a very high rate,[6] too quick to be noticed by the human eye. Although Li-Fi LEDs would have to be kept on to transmit data, they could be dimmed to below human visibility while still emitting enough light to carry data.[7] The light waves cannot penetrate walls which makes a much shorter range, though more secure from hacking, relative to Wi-Fi. Direct line of sight is not necessary for Li-Fi to transmit a signal; light reflected off the walls can achieve 70 Mbit/s.



Li-Fi has the advantage of being useful in electromagnetic sensitive areas such as in aircraft cabins, hospitals and nuclear power plants without causing electromagnetic interference. Both Wi-Fi and Li-Fi transmit data over the electromagnetic spectrum, but whereas Wi-Fi utilizes radio waves, Li-Fi uses visible light, Ultraviolet and Infrared. While the US Federal Communications Commission has warned of a potential spectrum crisis because Wi-Fi is close to full capacity, Li-Fi has almost no limitations on capacity.The visible light spectrum is 10,000 times larger than the entire radio frequency spectrum.Researchers have reached data rates of over 224 Gbit/s, which was much faster than typical fast broadband in 2013.Li-Fi is expected to be ten times cheaper than Wi-Fi.Short range, low reliability and high installation costs are the potential downsides.



It is predicted that future home and building automation will be highly dependent on the Li-Fi technology for being secure and fast. As the light cannot penetrate through walls, the signal cannot be hacked from a remote location.

But however the li-fi cannot be fully implimented because of certain drawbacks:


->Internet cannot be used without a light source. This could limit the locations and situations in which Li-Fi could be used.
->Because it uses visible light, and light cannot penetrate walls, the signal's range is limited by physical barriers.
->Other sources of light may interfere with the signal. One of the biggest potential drawbacks is the interception of signals outdoors. Sunlight will interfere the signals, resulting in interrupted Internet.
->A whole new infrastructure for Li-Fi would need to be constructed.


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