Li-fi is an optical version of wifi which uses LEDs to transfer datas.Using Lifi we can transfer datas fastly and efficiently.

1. Li-Fi(Light-Fidelity)
Presented by,
K. Arun (ІІІ-ECE-A)

2. Contents
• INTRODUCTION TO LI-FI
• HOW DOES IT WORKS?
• COMPARISON WITH WI-FI
• ISSUES WITH RADIOWAVE
• PROS OF LI-FI
• IS IT A PROVEN TECHNOLOGY?
• FUTURE TECHNOLOGY

3. INTRODUCTION TO LI-FI
• Li-Fi is a technology that uses the Light Emitting
Diodes to transmit data wirelessly.
• Fast and Cheap optical version of Wi-Fi, based
on VLC.
• VLC is a Data Communication medium which
uses the visible light between 400 THz (780
nm) and 800 THz (375 nm) as optical carrier for
data transmission

4. Li-Fi Environment

5. Who invented it?
• German Physicist Prof. Harald Haas, from the
University of Edenbergh, U.K.
• Demonstrated in the year of 2012.

6. How does it works?

7. • The heart of the technology is the generation
of high brightness LEDs.
• If LED is ON, transmit a digital signal 1 and if
the LED is OFF transmit a digital signal 0.
• Controller is connected at the back side of
these bulbs are used to code this LEDs

8. Li-Fi Vs Wi-Fi
Data Transfer Speed
• Li-Fi has a High
speed data transfer
rate over 1Gbps.
• Li-Fi uses the
Visible portion of the
EM
• Wi-Fi has a maximum
data transfer rate of
54Mbps.
• Wi-Fi uses the Radio
wave portion of EM.

9. Issues with Radiowave and an
Alternative
Capacity
Efficiency
Security
Availability
More Expensive

10. Contd.
• Can it be IR,UV,GAMMA or X-Rays? – No
 All the above rays are harmful to human being
when exposed to different proportions.
 So, We are left only with Visible spectrum

11. Pros of Li-Fi technology
 Capacity.
 Efficiency.
 Security.
 Availability.
 Installed in all places.
 No License needed.
 Millions of street lights can be converted into
efficient Li-Fi spots.

12. Is it a proven technology?
• Yes, this is a proven technology.
• Harald Haas demonstrated this technology
using an ordinary table LED lamp that
successfully transmitted data at speeds
10Mbps.
• To prove that the light is the source for data
streaming he periodically blocked the light, to
made the connection drop.

13. Future Technology
• 10Gbps data transmission is recently achieved
through Li-fi, while others didn’t.
• Spectrum is more broader and less cost
compared to RW spectrum which is more
expensive today.
• Installed easily in all areas and more secure
among hackers.

14. References
• www.wikipedia.org/li-fi
• www.whatistechtarget.com/li-fi
• www.zigmag.com/li-fi
• www.lificentre.com

15. Thank you

16. Queries