Li-Fi is a new technology that uses visible light communication and light-emitting diodes (LEDs) to transmit data wirelessly. It is the optical counterpart to Wi-Fi, transmitting data using light rather than radio waves. Li-Fi can provide much higher speeds than Wi-Fi and has advantages such as no interference with other electronic devices, better security since light cannot pass through walls, and an unlimited number of users without affecting speed. However, it requires line of sight between the transmitter and receiver and is limited by obstructions blocking the light. The document discusses how Li-Fi works, compares it to Wi-Fi, reviews its advantages and disadvantages, and potential applications in areas like hospitals.

1. By – Gaurav Gupta

2. Content:
1. Abstract
2. Introduction
3. Working Technology
4. Comparison between Li-Fi & Wi-Fi
5. Advantages of Li-Fi
6. Disadvantages of Li-Fi
7. Use in Various Areas
8. Conclusion
9. References

3. Abstract:
 Whether you’re using wireless internet in a coffee shop,
stealing it from the guy next door, or competing for bandwidth
at a conference, you have probably gotten frustrated at the slow
speeds you face when more than one device is tapped into the
network.
 German Physicist, Harald Haas come up with a solution he
called ”data through illumination”.
 Taking Fibber out of Fiber optic but sending data through an
LED light bulb.
 If you can’t see the light, you can’t access the data.

4. Introduction:
 Li-Fi is the optical version of Wi-Fi.
 Li-Fi is the transmission of data through LED light
bulb that varies in intensity faster than human eye.
 Data can be encoded as 1 when LED is ON and 0 as
LED is OFF.
 LED can be switched ON and OFF very quickly, which
give nice opportunities for transmission of data which
is called VLC (Visible Light Communication)

5. Working Technology:
 Li-Fi uses light from LEDs,
instead of radio waves as in the
case of Wi-Fi, to send
information in the form of
binary data.
 This binary data is received by
the receiver equipped with
decoder that decrypts the data
and triggers actions in your
smart device.
 If LED is ON, we can transmit a
digital 1 and if LED is OFF, we
can transmit a digital 0.
 Vary the rate at which the LED
flicker depending upon the data
that needs to be encoded.

6. Comparison between Wi-Fi & Li-Fi:
 Li-Fi uses light instead of radio waves in Wi-Fi.
 Li-Fi is ideal for high density wireless data coverage in
confined area and for relieving radio interference
issues.
 There is no limitation of area as in Wi-Fi Technology.
 This technology can be used underwater.

7. Advantages of Li-Fi:
 Li- Fi can solve problems related to insufficient radio
bandwidth.
 High data transmission upto 10Gbps can be achieved.
 Li-Fi has low implementation and maintenance cost.
 Li-Fi can be used in RF restricted environments.
 More devices can connect to internet without variation
in speed.
 “You might live Longer”. as light does not effect health
as RF signals.
 More secured as light cannot pass through walls.

8. Disadvantages of Li-Fi:
 Light can’t pass through objects e.g:wall,wood,glass etc
 A major challenge Li-Fi is facing; how the receiving
device will transmit back to transmitter.
 Interference from external light sources like sun, light,
normal bulbs, opaque materials.
 Line of Sight requirement, so area coverage is limited
and indoor mostly.

9. Use in Various Areas:
 Can be used in the places where it is difficult to lay the
optical fiber like hospitals. In operation theatre LiFi
can be used for modern medical instruments. In traffic
signals Li-Fi can be used which will communicate with
the LED lights of the cars and accident numbers can
be decreased. Thousand and millions of street lamps
can be transferred to Li-Fi lamps to transfer data. In
aircraft Li-Fi can be used for data transmission.
 It can be used in petroleum or chemical plants where
other transmission or frequencies could be hazardous.

10. CONCLUSION:
 The possibilities are numerous and can be explored further. If his
technology can be put into practical use, every bulb can be used
something like a Wi-Fi hotspot to transmit wireless data and we will
proceed toward the cleaner, greener, safer and brighter future.
 The concept of Li-Fi is currently attracting a great deal of interest, not
least because it may offer a genuine and very efficient alternative to
radio-based wireless.
 As a growing number of people and their many devices access wireless
internet, the airwaves are becoming increasingly clogged, making it
more and more difficult to get a reliable, high-speed signal.
 This may solve issues such as the shortage of radio-frequency
bandwidth and also allow internet where traditional radio based
wireless isn’t allowed such as aircraft or hospitals.
 One of the shortcomings however is that it only work in direct line of
sight.

11. References:
1. https://en.wikipedia.org/wiki/Li-Fi
2. https://www.quora.com/What-is-the-difference-
between-lifi-and-wifi