Li-Fi Wireless Optical Networking Technology

-Presented By1. Sandeep Kadav2. Prabodh Thombare3. Aditya Patil4. Vrushab Jadhav

-Guided ByMs. C. M. PanditProf. N. M. Arjunwadkar

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

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.

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

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.

Li-Fi Construction The Li-Fi product consists of three primary sub-assemblies:

Emitter (including bulb).

RF Driver.

Power supply.

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

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.

How Li-Fi Works

Server

Streaming Content

Power

Lamp Driver

Photo Detector

LED Lamp

Receiver End

Amplification and ProcessingReceived App Data

ApplicationLi-Fi has found its applications in many fields. Some of them are given below :

In Hospitals

In Airlines

Under Sea

In Hospitals

In Airlines

Under Sea

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.

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.

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

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.

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.

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

THANK YOU…!