LiFi is a new technology that uses light to transmit data wirelessly. It works by varying the brightness of LED lights at extremely high speeds to transmit data to a photodetector. This allows for high-speed bidirectional communication of data through light bulbs similar to how WiFi works through routers. LiFi provides advantages over WiFi like higher speeds, higher security, and energy efficiency. It could be used in places like offices, homes, and public areas to provide wireless internet access through LED light fixtures.

1. Techblog-1
Copyright © Fundarc Communication (xgnlab)
Smart Lighting with LiFi
Light has been always a
matter of scientific
interest, especially in
modern science. Many of
us has heard or some may
have studied about wave particle theory about light, which consider
light either as flood of particles known as photons or propagation of
electromagnetic waves in a range of frequencies – The visible light,
seven colors of rainbow separate out the frequencies.
So basically light carries certain information in form frequencies or
wavelength that is process by the human brain to distinguish the color
which help to recognize objects, shapes etc. That is pretty natural
phenomena.
In modern communication network information is sent through the
modulation of radio waves, that modulation in digital form is called as
data. We all use, now days, the devices like mobile phones, tablets, etc.
to use these data for information sharing to each other.
As we are becoming use to of this data for our many day to day
activities there is tremendous growth of this data being observed in
recent years and we need advancement in technology to transmit and
process it. So we have radio technologies like – WiFi, Cellular – 2G, 3G,
4G and now coming up 5G to bring these data to our devices of
communications.
What Light can do here?

2. Techblog-2
Copyright © Fundarc Communication (xgnlab)
Light has also been taken here as
specific medium like radio to
transmit data and it something
developed in line of WiFi, known
as LiFi.
The term LiFi was coined by Professor Harald Haas, at a Ted Global Talk
back in 2011 where he demonstrated LiFi for the first time. LiFi is a
technology, which provides high speed bi-directional network and
mobile communication of data using light. LiFi comprises of multiple
light bulbs that form a wireless network, offering a substantially similar
user experience, as with WiFi networks.
How it works?
When a constant current is applied to an LED light bulb, a constant
stream of photons is emitted from the bulb which is seen as
illumination. LED bulbs are semiconductor devices, and therefore the
illumination can be modulated at extremely high speeds which can be
detected by the photo-detector.

3. Techblog-3
Copyright © Fundarc Communication (xgnlab)
Using this technique high-speed information can be transmitted from
an LED light bulb. It is already there with us in simplistic form like those
used in low-cost infrared communications devices such as remote
control units.
It is high speed, 100X faster, high data density and highly secure
technology, to be used along with other wireless communication
systems.
Where the use?
If there is demand of data and also the demand of light, there could be
LiFi as best player of wireless communication.
Its main uses accordingly would in buildings, like for offices, houses, or
even in streets, shelters, hotspots etc.
Good part is it is a purely green
technology, low power,
sanitation, in RF hostile
environments such as
petrochemical plants and
hospitals.

4. Techblog-4
Copyright © Fundarc Communication (xgnlab)
Some interesting facts
LiFi technology can be enabled to dim low enough that a room will
appear dark and still transmit data.
There is no flickering of light observed by human eyes as the rate of
change of illumination is very high nothing in range of perception to
any eye.
LiFi is not a line of sight, it uses light reflection, light diffraction etc.
LiFi works in both, day time and in night, nothing to do with
environment light.
What’s the cost?
For end user it will be coming embedded with devices like, mobile,
laptop, tablet etc. There would be LED bulb available to install in
home’s as well, just like normal WiFi access points and in similar price
range.