This document discusses free space optics, also known as free space photonics, which transmits information using invisible light beams between telescopes over distances of several kilometers. It works by using two telescopes that transmit and receive the light beams, offering transmission capacities ranging from 100Mbps to 2.5Gbps. The key advantages are that it provides a flexible networking solution at low cost with unlimited bandwidth, as long as there is a line of sight between the telescopes. However, it faces challenges from atmospheric factors, physical obstructions, changes in pointing stability, and solar interference.

1. Free
Space Optics
Under The Esteemed Guidance of
Mr.G.Venugopal
Associate Professor
Department Of Computer Science and Engineering
Sri Satya Narayana Engineering College, Ongole
By
R.Mouli sai (07X91A0528)

2. OVERVIEW
INTRODUCTION
HOW FSO WORKS
ADVANTAGES
CHALLENGES
SECURITY
CONCLUSION

3. INTRODUCTION………
Advanced Communication Technology
Uses Infrared beams for transmission
Also called Free Space Photonics (FSP)
Introduced by Alexander Graham Bell

4. The transmission of information using
light is actually not a new idea.
In the late nineteenth century, Alexander
Bell expanded his "phone-phone"
communication which modulated by
sunlight.

6. HOW FSO WORKS………….?
Consists of two Telescopes
Transmits invisible light beams b/w Telescopes
Offer capacities in range of 100Mbps to 2.5Gbps
Can function over distances of several Kms

8. ADVANTAGES……………….
Flexible Networking Solution
Low Cost
Unlimited Bandwidth
Possible to mount FSO inside even Buildings
Only requirement is Line of Sight b/w to ends
of the link

10. CHALLENGES…………..
Atmosphere Factors
Physical Obstructions
Change in pointing stability
Scintillation
Solar Interfernce

12. SECURITY………
Laser beams can’t detected with spectrum
analyzers or RF meters
Line of sight cannot be intercepted easily
Beams are harder to find and crack
Data can be transmitted over an encrypted
connection

13. CONCLUSION………….
Provides low cost, rapidly deployable method
of gaining access to fiber optic backbone
FSO complement legacy network investments
FSO eliminates the need to obtain costly
spectrum licences

14. REFERENCES………….
http://www.freespaceoptics.org
http://www.networkmagazin.com
Heinz A. Willerbrand, Baksheesh S. Ghuman
“Fiber Optics Without Fiber”

15. ANY
QUERIS

16. T ANK
H
Q