1.  Li-Fi is the transmission of data through
illumination by taking the fiber out of fiber
optics by sending data through a LED light bulb.
 This varies in intensity faster than Human Eye
can follow.
 It is the fast and cheap wireless
communication system which is optical version
of the Wi-Fi.

2. Its Working is much simply explained as
follows:
 If the LED is on, the digital 1 is transmitted.
 And if it is off, the digital 0 is transmitted.
 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 and0s.

4. Li-Fi product consists of 4 primary sub-
assemblies:
 Bulb
 RF power amplifier circuit (PA)
 Printed Circuit Board (PCB)
 Enclosure

5.  The PCB controls the electric inputs and
outputs of the lamp and houses the
microcontroller used to manage different lamp
functions.
 An RF (radio-frequency) signal is generated by
the solid-state PA and is guided into an electric
field about the bulb.

6.  The high concentration of energy in the electric
field vaporizes the contents of the bulb to a
plasma state at the bulb’s center; this
controlled plasma generates an intense source
of light.
 All of these sub-assemblies are contained in
an aluminium enclosure.

8.  Li-Fi is a term of one used to describe visible
light communication technology applied to high
speed wireless communication.
 It acquires this name due to the similarity to Wi-
Fi, only using light instead of radio.

9.  Wi-Fi is great for general wireless
coverage within buildings, and Li-Fi is
ideal for high density wireless data
coverage in confined area and for
relieving radio interference issues, so the
two technologies can be considered
complimentary.

10. Technology Speed Data density
 Wierless (current)
Wi-F-IEEE 150Mbps *
802.11n
Bluetooth 3Mbps *
IrDA 4Mbps ***

11. Technology Speed Data density
 Wireless (future)
Wi-Gig 2Gbps **
Giga-IR 1Gbps ***
Li-Fi 1Gbps ****

12.  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.

14. Some of the applications of Li-Fi are given
below:
 Medical field
 Airlines
 Power plant
 Military operations
 Under sea water

15.  Used for modern medical instruments.
 Used in petroleum or chemical plants where
other transmission or frequencies could be
hazardous.
 Thousands and millons of street lamps can be
transferred to Li-Fi lamps to transfer data.

16.  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 efficient.
 Transmission of data is fast and easy.

17.  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.