This is one the future Trending technology to transmit a date with the help of lights

1. LIGHT FIDELITY
(LI-FI)
technology
SRI RANGANATHAR INSTITUTE OF ENGINEERING AND
TECHNOLOGY
PRESENTED BY:
ECE-DEPARTMENT.

2. TABLE OF CONTENTS
• What is Li-Fi ?
• Introduction
• History
• Present Scenario
• Issues of Using radio Spectrum
• Principle of Li-Fi
• Why Li-Fi use VLC ?
• Li-Fi VS Wi-Fi
• Applications of Li-Fi
• Conclusion

3. What is Li-Fi(LIGHT FIDELITY)
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

4. HISTORY
• Prof. Harald Haas,from
university of Edinburgh in the
UK is the founder of LiFi.
• On 20th July 2011 he used a
table lamp with an LED bulb to
transmit a video of blooming
flowers that was then
projected onto a screen behind
him. During the event he
periodically blocked the light
from lamp to prove that the
lamp was indeed the source of
incoming data.

5. Present scenario
1.4 Million Base Stations 5 Billion Mobile Stations

6. PRESENT SCENARION
Radio spectrum is congested but the demand for
wireless Data double each day
Data in the form of tera bytes travel every week or
month
Every one want to use wireless data but the capacity is
drying up resulting in different issues
 so,what can carry this excess demand in future

7. Issues of using Radio Spectrum
capacity
availability
efficiency security

8. How can resolve this issue?
Li-Fi
technology

9. Principle of Li-Fi
When LED is ON,we transmit a digital signal 1 and if
the LED is OFF,we transmit a digital signal 0

11. WHY LI-FI USE VISIBLE LIGHT COMMUNICATION
Gama rays,x-rays,ultraviolet rays are harmful for the human for the
human body
Infrared rays are also dangerous due to eye safety regulation and can
only be used with low power
Radio waves are expensive and they are less secure
Therefore,only visible rays or visible light spectrum is left which is not
harmful for humans.
Radio
waves
Infrared
rays
Visible
rays
ultraviolet
rays X-rays
Gamma
rays

13. Applications of Li-Fi
 TRAFFIC SCENARIO

14. HOME AND SMALL
OFFICES
o In home and small offices,Li-Fi can be
used to communicate with the devices
such as:
 Laptops
 Internet access
 HD video streaming
 printer

15. Street lamps & Ocean lamps
STREET LAMPS
• There are millions of lamps
deployed around the world
• Each of these street lamps
could be a free access point.
AN OCEAN LAMPS
• Li-Fi can even work under
water where Wi-Fi fails
• Communication between naval
becomes easy

16. conclusion