Scribd
Upload
169 views21 pages

LASER Communication Overview

This document discusses laser communication, including: 1) Laser communication systems provide wireless connections through line-of-sight transmission of laser beams, avoiding the need for buried cables. 2) Lasers work via absorption, spontaneous emission, pumping to create population inversion, and stimulated emission. 3) Laser types include solid-state, gas, liquid, and semiconductor lasers. 4) A laser communication system includes a laser transmitter with a laser diode and signal processing, and a laser receiver with a detector and signal amplification.

Uploaded by

JHANSYHARSHITHA VANKAYALAPATI
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPTX, PDF, TXT or read online on Scribd
169 views21 pages

LASER Communication Overview

This document discusses laser communication, including: 1) Laser communication systems provide wireless connections through line-of-sight transmission of laser beams, avoiding the need for buried cables. 2) Lasers work via absorption, spontaneous emission, pumping to create population inversion, and stimulated emission. 3) Laser types include solid-state, gas, liquid, and semiconductor lasers. 4) A laser communication system includes a laser transmitter with a laser diode and signal processing, and a laser receiver with a detector and signal amplification.

Uploaded by

JHANSYHARSHITHA VANKAYALAPATI
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPTX, PDF, TXT or read online on Scribd
You are on page 1/ 21

LASER Communication

SUBMITTED BY ::
M. Sai Harshan Reddy
Contents :
1. Introduction
2. Why LASER ?
3. Principles and working of LASER
4. Types of LASER’s
5. Block diagram of LASER communication
6. LASER Transmitter
7. LASER Receiver
8. Advantages
9. Disadvantages
10.Applications
11.Conclusion
12.References
Introduction
"Light Amplification by Stimulated Emission of Radiation"
•Laser communications systems are wireless

connections through the atmosphere.

•They work similarly to fiber optic links,


except the beam is transmitted through
free space.
• While the transmitter and receiver must require
line-of-sight conditions, they have the benefit of
eliminating the need for broadcast rights and
buried cables.
Why LASER ??

Optical fiber link

Direct Laser Link


Principles and working of LASER

1.Absorption

2.Spontaneous emission

3. Pumping and population inversion

4. Stimulated emission of laser


ABSORPTION SPONTANEOUS EMISSION

PUMPING AND POPULATION INVERSION STIMULATED EMISSION


Types of LASERS
•Solid-state Laser-- ruby Laser ; color center Laser;
nd:YAG Laser
•Gas Laser -- He-Ne Laser ; CO2 Laser
•Liquid Laser -- Dye Laser
• Semiconductor Laser--hetero junction Laser ;
homo junction Laser
SOLID LASER

ND:YAG
Ruby LASER
GAS LASER

He-Ne LASERE CO2 LASER


LIQUID LASER
SEMICONDUCTOR LASER

Homo junction laser Hetero junction laser


BLOCK DIAGRAM OF LASER COMMUNICATION
Laser Transmitter:

•The Transmitter involves a signal


processing circuit and a laser diode.

•A laser diode is used to create the


laser signal.

•Laser Diodes include Photodiodes


for feedback to insure consistent
output.
Laser Receiver

• The receiver involves the laser detector and signal


and signal amplifying circuit.

• The LASER detectors may be:


• PIN diodes
• Avalanche Photo Diodes(APD)
• Single or multiple detectors
Advantages

•Ease of deployment
•Can be used to power devices
•License-free long-range operation
•High bit rates
•Immunity to electromagnetic interference
•Full duplex operation
•Increased security when working with narrow beam(s)
•No Fresnel zone necessary
Disadvantages

•Beam dispersion
•Atmospheric absorption
•Rain
•Fog
•Snow
•Scintillation
•Interference from background light sources (including the
Sun)
•Pointing stability in wind
•Pollution / smog
Applications
SPACE COMMUNICATION

FREE SPACE OPTICAL COMMUNICATION


Other applications are:
•Defense and Sensitive Areas
•Airport Runways
•Digital data transmission
•Medicine
Conclusion ::

LASER would be visible


or invisible , where visible
laser may destroy
everything and invisible
can create anything
References :
Thank you

You might also like