the future of wifi.Light Fidelity or Li-Fi is a Visible Light Communications (VLC) system running wireless communications travelling at very high speeds. Li-Fi uses common household LED (light emitting diodes) lightbulbs to enable data transfer, boasting speeds of up to 224 gigabits per second

1. By: ikramullah

2.  In electromagnetic spectrum, gamma, UV rays are dangerous
for human body.
 IR rays, due to eye safety regulations, are not used

3.  Light based WI-FI
 Light is used instead of radio-waves to transmit
information
 Transceiver fitted LED lamps acts like Wi-Fi modems
 LED lamps can light a room as well as transmit-receive
information
 Provides illumination as well as data communication

4. 5G optical
communication
technology

5.  began during the 1990's
 LED's could be retrofitted to
send information.
 Harald Haas continues to
wow the world with the
potential to use light for
communication
Invented in 2011

6. Demand For Wireless Data
Doubles Each Year
 Issues
Capacity, Availability,
Efficiency, Security Are
Solved
Speed Of Data Transmission Can
Be
Increased.

7.  CAPACITY
 Spectrum is 10,000 times greater than that of radio
frequency
 EFFICIENCY
 Highly efficient since LED consumes less energy
 AVAILABILITY
 Light waves available everywhere.
 SECURITY
 Cannot penetrate through walls. Hence data cannot be
intercepted.

8. If LED is ON, digital data ‘1’ is transmitted & if LED is
OFF, digital data ‘0’ is transmitted.
so fast that a human eye cannot
detect it
 A controller connected at the back side of these LEDs is
used to code data.
.

10.  LIFI can be used in
sensitive areas such as aircrafts for data transmission
without causing interference
Places where it is difficult to lay optical fibers like
operation theaters
Traffic scenarios, thereby reducing accidents
Underwater applications where radio waves cannot
propagate.
Industries like petrochemical plants, nuclear power plants
, petrol pumps etc

11.  Data rate greater than 10 Gbps; to be downloaded in 30
seconds
 Can be used anywhere.
less energy.
As light waves cannot provides secured communication.
radio based wireless; since it is quick
and reliable.

12. Thus, if Li-Fi technology can be put into practical use, every
bulb can be used as an alternative to Wi-Fi hotspots. It
provides simple, faster and efficient wireless data
communication. Li-Fi will make us to proceed towards the
cleaner, greener, safer and brighter future.