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1. Li-Fi Wireless Optical Networking Technology
-Presented By
1. Sandeep Kadav
2. Prabodh Thombare
3. Aditya Patil
4. Vrushab Jadhav
-Guided By
Ms. C. M. Pandit
Prof. N. M. Arjunwadkar

2. Contents
• Introduction
• History
• Li-Fi Vs Wi-Fi
• Construction
• Working
• Applications
• Limitations
• Advantages & Disadvantages
• Conclusion

3. Introduction
 Li-Fi means “Light Fidelity”.
 Li-Fi is fast and cheap optical version of Wi-Fi.
 Li-Fi is a technology that uses the Light Emitting Diodes (LEDs) to transmit the
data wirelessly.
 Li-Fi based on Visible Light Communication (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. History
 This technology was invented by German Physicist
“HARALD HASS”, from the university of
Edinburgh, U.K.
 He demonstrated it in the year 2011.
University of Edinburgh :
Fig 1. Prof Harald Hass

5. Li-Fi vs WiFi
 Li-Fi has a high speed data transfer rate
over 1Gbps{1024 mbps}.
 Li-Fi is highly secure.
 In Li-Fi Visible Light
Communication(VLC) is used.
 Do not have any interference issues.
 Works in high density environment.
 Wi-Fi has a data transfer rate of
maximum 54 mbps.
 Wi-Fi is medium secure.
In Wi-Fi wireless communication is
used.
Will have interference issues from
nearby access points(routers).
Works in low density environment.

6. Li-Fi Construction
The Li-Fi product consists of three primary sub-assemblies:
 Emitter (including bulb).
 RF Driver.
 Power supply.

7. Li-Fi Construction….
 At the heart of Li-Fi is the bulb sub-assembly where a sealed bulb is embedded in a
dielectric material.
 The dielectric material serves two purposes:
1) Waveguide
2) Electric field

8. Li-Fi Construction…
 Power amplifier (PA) assembly that uses an LDMOS device.
 Converts electrical energy into RF power.
 The PA is designed for ruggedness and efficiency.
 The RF driver also contains controls circuit for
digital and analog lighting controls.

9. How Li-Fi Works
Server
Streaming
Content
Power
Lamp Driver
Photo Detector
LED Lamp
Receiver End
Amplification and
Processing
Received App Data

10. Application
Li-Fi has found its applications in many fields. Some of them are given below :
In Hospitals
In Airlines
Under Sea

11. In Hospitals

12. In Airlines

13. Under Sea

14. How it is different?
Li-Fi technology is based on LEDs for the transfer of data.
The transfer of the data can be with the help of all kinds of
light, no matter the part of the spectrum that they belong. That
is, the light can belong to the invisible, ultraviolet or the
visible part of the spectrum.

15. Limitations or Challenges
 Light can’t pass through the object.
 Interfaces from external light sources like sun light, normal bulbs and opaque materials
in the path of transmission will cause interruption in the communication.

16. Advantages of Li-Fi
 Capacity :
 10000 times more spectrum than RADIO WAVES.
 Light boxes are already present, so infrastructure is available already and installed.
 Availability :
 Light is present everywhere.
 Data is present where light is present
 Efficiency :
 Highly efficient because LED consumes less energy

17. Disadvantages of Li-Fi
 Visible light cannot penetrate through solid objects.
 A major challenge of LiFi is how the receiving device will transmit back to
transmitter.
 Interferences from external light sources like sunlight, in the path of transmission
will cause interruption in the communication.
 Data transmission can be easily blocked by any object placed in front of LED
source.

18. Conclusion
 The possibilities are numerous and can be explored further.
 If this technology can be put into practical use, every bulb can be used something
like a Wi-Fi hotspot.
 We will proceed toward the cleaner, greener, safer and brighter future.
 This may solve issues such as the shortage of radio-frequency bandwidth.
 Allows internet where traditional radio based wireless isn’t allowed such as aircraft
or hospitals.

19. Reference
 http://en.wikipedia.org/wiki/Li-Fi
 seminarprojects.com/s/seminar-report-on-Li-Fi
 http://teleinfobd.blogspot.in/2012/01/what-is-lifi.html
 technopits.blogspot.comtechnology.cgap.org/2012/01/a-lifi-world
 www.lificonsortium.org
 the-gadgeteer.com/2011/08/LI-FI

20. THANK YOU…!