Laser communication has several current applications including defense systems, airport runways, and mass communication. NASA has also used laser communication technologies for spacecraft like MESSENGER and for satellite-to-satellite communication. Lasers are important for space communication because light is not corrupted in a vacuum as it would be through optical fibers. Lasers can also use different colors via wavelength division multiplexing to increase data transmission rates. Two-way laser communication could enable data rates 10 to 1000 times faster than radio waves.

2. o Introduction
o How it work?
o Why not optic fibers?
o Why not RF?
o Current uses of laser communication
o Importance of laser communication
o conclusion

10. Current Applications
Defence and Sensitive Areas
Laser Defence systems established across the world can
detect enemy ships and missiles while at the same time
disabling them.

11. Airport Runways
Laser communication systems on
airport runways can send signals back
to headquarters letting officers know
when and what planes have landed.
Mass Communication
Laser communications have been
utilized for mass communications
including telephone conversations and
even television channels.

12. NASA
Nasa has created lots of different
technologies which include laser
communications. One recent NASA
accomplishment was a successful
exchange of laser pulses with the
MESSENGER spacecraft and an Earth-
based observatory which set a new
record for laser transmission in space.
Satellite-to-Satellite
Nasa has also developed Satellite-to-
Satellite communications using laser
communications.

13. • The importance of using lasers in space for communications is
that since light is traveling in space (a vacuum ) the light signals
are not corrupted as much as they would be traveling through
optical fiber.
• In addition, instead of using one colour of a laser to transmit
information, a satellite could have many different lasers, each
transmitting information on a different colour.This method of
using different colours to increase the amount of information to
be transmitted is called "wavelength division multiplexing"
and is similar to how conventional radio signals are broadcast
on different radio frequencies.With this type of laser
technology, optical communication links in space could easily
handle many tens of trillions of bits of information being
sent every second.
Importance of Laser
Communications

16. Conclusion
• Two-way laser communication in space has long been a
goal for NASA because it would enable data
transmission rates that are 10 to 1,000 times higher
than traditional radio waves.
• While lasers and radio transmissions both travel at
light-speed, lasers can pack more data. It's similar to
moving from a dial-up Internet connection to
broadband.