U.I.T. Burdwan University
Roll No. 20122033
Reg. No. 2564 of 2012-13
What is LASER Communication??
Laser communication systems
are wireless connections through
They work similarly to fiber
optic links, except the fact that,
in lasers, beam is transmitted
through free space.
LASER Communication System
Basic block diagram of laser communication system
LASER DIODE PHOTON SENSOR
DATA TO BE SENT DATA RECOVERED
Transmitter Side Medium Receiver Side
Transmitters consist of
Signal Processing unit
The LASER Diode is being turned
ON/OFF quickly as needed according to the
Receiver consist of
Telescope (referred as Antenna)
It concentrates large number of photon into a smaller area
(a) Photon Multiplier Tubes
(b) Avalanche Photodiode
Signal processing unit
Why LASER Communication??
Current mostly used high speed technologies:
Why not Fiber Optics??
Cannot be used in Satellite links
Laser Communication is low cost and can be
applicable where Fiber Optics is impractical to use.
Why not Microwave??
Beam width: Laser beam
width is narrower than that of
Bandwidth: very much larger
for Laser than microwave.
Security: Laser is more secure
Power: Low power needed
for laser compared to microwave.
Very antenna size for Laser
as compared to microwave.
Laser link can be affected by-
Fog, Rain, Pollution (smoke)
These can be reduced by using Laser tuning,
multiple number of transmitters, filters etc.
Defense and sensitive areas
At airports for communication across the runways
Satellite – satellite communication
Earth – satellite communication
It is more secure and provides high bandwidth
requirements. The low power consumption is also a
It can be the mostly used technique worldwide in