LIGHT FIDELITY (LI-FI)BY SAI CHARAN TEJA

• Present Usage of Communication

• Electromagnetic spectrum

• What is Li-Fi?

• History

• Working principle

• Applications

• Limitations

• Conclusion

Contents:

• The Need of wireless data has been increasing day by day in this modern world.

• The major source used for wireless transmission is Radio frequency.

Present usage of communication:

1.4 Million Base

Stations

5 Billion

ELECTRO MAGNETIC SPECTRUM

Radio Frequency-Issues

Availability

Security

Capacity

Efficiency

What is Li-Fi?

• Li-Fi, or light fidelity, is 5G visible light communication systems using light from light-emitting diodes(LEDs) as a medium to deliver networked, mobile, high-speed communication in a similar manner as Wi-Fi and Optical fiber.

• Visible light communications (VLC) signals work by switching bulbs on and off within nanoseconds , which is too quick to be noticed by the human eye.

History:

• Professor Harald Haas, from the University of Edinburgh in the UK, is widely recognized as the original founder of Li-Fi

• Research has been going on in all the developed countries from 1990, but Dr. Harald has stunned the world when he presented on Li-Fi during Global Ted talk 2011.

TYPICAL LI-FI ENVIRONMENT

STREET LIGHTSCENARIOS

UNDER WATER

SCENARIOS

AEROPLANE SCENARIOS

In RF restricted

environments

LIMITATIONS & CHALLENGES

• Interferences from external light sources like sun light, normal bulbs, and opaque materials in the path of transmission will cause interruption in the communication.

• Li-Fi requires line of sight.

• High installation cost of the VLC systems.

• A major challenge facing Li-Fi is how the receiving device will transmit back to transmitter.

CONCLUSION

BROWSE DATA WITH SPEED OF LIGHT