li-fi technology which uses LED lights for data transmission.

1. LI-FI TECHNOLOGY
IN MARINE FIELD

3. Abstract:
With the use of Li-Fi technology we can transfer data
through wireless. Li-fi is a photosensitive wireless
technology to provide connectivity within localised
area. It helps in faster and more secure data
transmission. It is cost effective and less at cost than
Wi-Fi. Thousands of data can be transferred at a
higher speed. At one corner is the LED and the other
corner is the light sensor or photo detector that
detects light as soon as the LED starts glowing and
gives a binary output o 0 and 1.light can produce
data rates faster than 10 megabits per second faster
than the average broadband used. Uses visible light
communication instead of radio frequency. This
paper construes with the use of light radiating diodes
Li-Fi technology to transfer data through wireless. .
Li-Fi aids the marine technology to endeavor their
goals under deep sea since Wi-Fi fails to do that.

4. Introduction:
Li-fi is transmission of data through
illumination by taking the fibre out of fibre
optics by sending data through a LED light
bulb that varies intensity faster than
human eye can follow. German physicist
professor Harald Haas coined the term LI-
FI and is the founder of this technology in
2011 TED global talks. In Oct 11 few
companies and industry groups formed
the Li-Fi consortium to promote these
high speed optical wireless cables.

5. This technology is called light fidelity and is
popularly known as li-fi. The general term
visible light communication includes any use
of the visible light portion of the
electromagnetic spectrum to transmit
information. Li-Fi is more secure than Wi-Fi
with hackers unable to access unsecured
internet connections from out of sight of the
transmitter.

6. How does Li-Fi work:
When the LED is turned on the microchip converts
this digital data in the form of light. On the other end this light is detected
by photosensitive devices. Next this light is amplified and processed and
then fed to the device. The heart of this technology is new generation high
brightness LEDs. If Led is on we transmit signal 1 and if the led is off, we
transmit signal 0.a controller is connected at the back side of these led
bulbs to code data to these LEDs.

7. Comparison between Li-I and Wi-Fi:
LI-FI is a term of one used to describe visible
light communication technology applied to high
speed wireless communication. It acquired this
name due to the similarity to WI-FI, only using
light instead of radio. Li-Fi is great for general
wireless coverage within buildings, and li-fi is
ideal for high density wireless data coverage in
confined area and for relieving radio interference
issues, so the two technologies can be
considered complimentary.

8. Li-Fi technology in marine:
Li-Fi is a new exemplar for photosensitive
wireless technology to provide
unprecedented connectivity within a localized
data centric environment. There has been a
complete shift in wireless technology due to
increase in demand for faster and more
secure data transmission and protected data
transmission. Li-Fi is such a free band which
is license free that is why it is less at cost
than Wi-Fi. With the use of special intonation
using a distinctive signal processing
technology thousands of streams of data can
be transferred simultaneously at higher
speed.

9. Navy is currently using a slow and antiquated system for underwater
communication that does not quite jibe well with the poor acoustics
that lie underwater.

10. Radio waves also do not travel efficiently
underwater. For use in petrochemical plants or on
airplanes, Li-Fi emissions would be a great
option, since Wi-Fi tends to interfere
with onboard electronics. Li-Fi can be
advantageous for the submarines in the middle
of the ocean where radio waves cannot intrude
and with the salutary advantage, Li-Fi paves a
way in the sea water, deep into the ocean. Even
though

11. Similarly the trapped submarines or the
submarines caught by the adversary can be
rescued relatively fast when compared to the
other sources since the data can be sent very
fast so that even in few seconds they may
ask for aids.
submarines have navigators and sensors they
need a effective way to transit all the data to
the appropriate sources as soon as possible
to get their needs. Another pragmatic use of
this Li-Fi is that the lost submarines can be
found out if they are equipped with the Li-Fi
system within a short period since it is
effectively fast.

12. Advantages:
Underwater ROVs, those favourite toys of treasure
seekers and James Cameron, operate from large
cables that supply their power and allow them to
receive signals from their pilots above. ROVs work
great, except when the tether isn’t long enough to
explore an area, or when it gets stuck on something.
If their wires were cut and replaced with light — say
from a submerged, high-powered lamp — then they
would be much freer to explore. They could also use
their headlamps to communicate with each other,
processing data autonomously and referring findings
periodically back to the surface, all the while
obtaining their next batch of orders.

13. 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.

14. Reference:
[1]seminarprojects.com/s/seminar-report-
on-lifi
[2]http://teleinfobd.blogspot.in/2012/01/ha
t-is-lifi.html.
[3]http://en.wikipedia.org/wiki/Li-Fi.

15. The future is here!!!
Thank you