Issues Regarding Radio Spectrum
One germen phycist. Harald Haas has come up
with a solution he calls “data through illumination” –
by sending data through an LED light bulb that
varies in intensity faster than the human eye can
follow. He had coined the term Li-Fi firstly in TED
Global talk conference in UK on VLC. Haas says his
invention, which he calls D- LIGHT, can produce
data rates faster than 10 megabits per second.
Li-Fi means “Light Fidelity”.
At the heart of this technology is a
new generation of high brightness light-
It is possible to encode data in the
light by varying the rate at which the
LEDs flicker on and off to give different
strings of 1s and 0s.
Li-Fi technology is based on LEDs for the
transfer of data.
The transfer of the data can be with the help
of all kind of light i.e Light may be Invisible,
Ultraviolet or Visible part of spectrum.
The speed of the internet is incredibly high
and the user everything in just a few minutes.
Issues Regarding Radio
Cost and Expensive
Available within the range of base
Unavaliable in air crafts.
Million of Base Station consume huge
amount of energy for transmittiong the
Less Secure (passage through Walls).
Used for modern medical instruments.
Used in petroleum or chemical plants
where other transmission or frequencies could
Thousands and millons of street lamps can be
transferred to Li-Fi lamps to transfer data.
Advantages of LI-FI
It is possible to achieve more than
10Gbps, theoretically allowing a high-
definition film to be downloaded in 30sec.
Mostly powered by LEDs so it is cost
Transmission of data is fast and easy.
Its main advantage is it’s Bandwidth is
10,000 times than the radio waves.
Presence of light is essential.
There should be line of sight.
Works better with fluorescent
light and LEDs but very low
efficiency with Bulbs.
The concept of Li-Fi is currently
attracting a great deal of interest, not
least because it may offer a genuine and
efficient alternative to radio-based
wireless. As a growing number of people
and their devices access wireless
internet, the air waves are becoming
increasingly clogged, making it more and
more difficult to get a reliable, high-
speed signal. So Li-Fi has a bright future.