this presentation is about Light fidelity technology.

1. TECHNOLOGY
By
T.ARUNKUMAR,
MCA
Bannari Amman Institute of Technology,
Sathyamangalam.

3. Introduction
• Li-Fi stands for Light-Fidelity
• Li-Fi technology, proposed by the German
physicist—Harald Haas
• provides transmission of data through
illumination by sending data through an LED
light bulb that varies in intensity faster than
the human eye can follow.

4. At present
• The current wireless networks that connect
us to the internet are very slow when
multiple devices are connected.
• Fixed bandwidth

5. In future
• There is no fixed bandwidth in LiFi
• Can enjoy higher data transfer rates.

6. The Technology
• Li-Fi uses visible light instead of Gigahertz
radio waves for data transfer.
• It is based on Visible Light Communication
(VLC)
• uses visible light between 400 THz (780 nm)
and 800 THz (375 nm) as optical carrier for
data transmission and illumination.

7. Components
• a high brightness white LED which acts as
transmission source.
• a silicon photodiode with good response to
visible light as the receiving element.

8. primary sub-assemblies
• Bulb
• RF power amplifier circuit (PA)
• Printed circuit board (PCB)
• Enclosure

9. How it works?
• The PCB controls the electrical inputs and
outputs of the lamp.
• An RF (radio-frequency) signal is generated
by the solid-state PA and is guided into an
electric field about the bulb.
• plasma generates an intense source of light.

10. The Logic of LiFi
• If the LED is on, a digital 1 is transmitted.
• If the LED is off, a digital 0 is transmitted.

11. Recent advancements
• it is possible to achieve more than 10 Gbps of
speed.
• which would allow a high-definition film to
be downloaded in just 30 seconds

12. COMPARISON OF SPEED OF VARIOUS WIRELESS
TECHNOLOGIES
TECHNOLOGY SPEED
Wi-Fi – IEEE 802.11n 150 Mbps
Bluetooth 3 Mbps
IrDA 4 Mbps
Li-Fi >1 Gbps

13. Problems in WiFi
• Capacity
• Efficiency
• Availability
• Security

14. Advantages of LiFi
• Capacity
• Efficiency
• Availability
• Security

15. Disadvantages of LiFi
• Light cannot penetrate into walls
• it only works in direct line of sight.

16. Applications of LiFi
• Education systems
• Medical Applications
• Cheaper Internet in Aircrafts
• Underwater applications
• Disaster management
• Applications in sensitive areas
• Traffic management
• Replacement for other technologies

17. THANK YOU