1. Li-Fi Technology ATHULDEEP N S7 ECE Reg No: 11021432
2. 8/24/2014 2
3. 8/24/2014 3
4. 8/24/2014 4
5. 90 hours of video are uploaded to YouTube every minute. 35%
of global YouTube views come from mobile devices. Internet video
traffic is growing. 8/24/2014 5
6. Radio Spectrum is congested. Demand for wireless data double
each year. Available within the range of Base stations. Limited
availability. ISSUES REGARDING RADIO-SPECTRUM 8/24/2014 6
7. 8/24/2014 Unavailable in aircrafts. Less secure (passes
through the walls). Cost and Expensive. Less bandwidth compared to
other spectrums. Harmful to humans health. 7
8. Electromagnetic Spectrum LI-FI USES THE VISBLE LIGHT PORTION
OF THE EM SPECTRUM WIFI USE THE RADIOWAVE PORTION OF THE EM
SPECTRUM 8/24/2014 8
9. DIFFERENCE BETWEEN TECHNOLOGIES 8/24/2014 9
10. Li Fi- Light Fidelity A light-based Wi-Fi. light instead of
radio waves to transmit&receive information. Transceiver-fitted
LED lamps. Can light a room. Transmit and receive information.
8/24/2014 10
11. Harald Haas Professor Harald Haas, from the University of
Edinburgh in the UK, is the founder of Li-Fi. Demonstrated it in
the year 2012. WHO INVENTED IT ? 8/24/2014 11
12. 8/24/2014 12
13. VISIBLE LIGHT COMMUNICATION (VLC) 8/24/2014 Visible light
communication ( VLC ) is a potential solution to the global
wireless spectrum shortage. Li-Fi technology is based on Visible
Light communication. 13
14. VLC is a data communication medium, which uses visible
light. 400 THz - 800THz as optical carrier for data transmission
and illumination. It uses fast pulses of light to transmit
information wirelessly. 8/24/2014 14
15. 8/24/2014 KEY IDEA 15
16. BLOCK DIAGRAM Data Modulation (PPM/FSK) Light Source
8/24/2014 Data Demodulation (PPM/FSK) Photo Detector 16
17. OPERATION PROCEDURE If the LED is ON, you transmit a
digital 1. If it's OFF you transmit a digital 0. They can be
switched on and off very quickly, which gives nice opportunities
for transmitting data. 8/24/2014 17
18. Some LEDs and a controller that can code data into those
LEDs. Usage of an array of LEDs for parallel data transmission, or
using mixtures of red, green and blue LEDs to alter the lights
frequency. Theoretical speed of 10 Gbps. Usage of rapid pulses of
light to transmit information wirelessly. 8/24/2014 18
19. PARALLEL DATA TRANSMISSION. 8/24/2014 19
20. Digital Modulation Technique 8/24/2014 20
21. MAIN COMPONENTS A high brightness white LED, Which act as a
communication source. A photodiode which shows good response to
visible wavelength region serving as the receiving element.
8/24/2014 21
22. Transmitting Element LED 8/24/2014 22 A high brightness
white LED which acts as transmission source.
23. Receiving Element (Detector) Photo Diode. 8/24/2014 23 A
silicon photodiode which shows good response to visible wavelength
region serving as the receiving element fitted over the
computer
24. LI-FI ENVIRONMENT 8/24/2014 24
25. 8/24/2014 25
26. APPLICATIONS 8/24/2014 26
27. RF RESTRICTED ENVIRONMENTS 8/24/2014 27
28. AIRCRAFT CABINS 8/24/2014 28
29. ACCESS POINTS IN PUBLIC INTERNET HOTSPOT 8/24/2014 29
30. UNDER WATER COMMUNICATION 8/24/2014 30
31. Larger bandwidth ( 10,000 times the radio bandwidth ). High
speed data rate . High efficiency . Highly secure. Works even under
water in sea. Safe for health . More availability. Low cost
solution. ADVANTAGES 8/24/2014 31
32. COMMON MISCONCEPTIONS There will be interference from
sunlight. You must have line-of-sight. 8/24/2014 32
33. CONCLUSION This technology can be put into practical
use,every bulb can be used something like a Wi-Fi hotspots to
transmit wireless data. It will proceed toward the cleaner,
greener, safer & brighter future ! This may solve issues such
as the shortage of radio frequency bandwidth. 8/24/2014 33
