Spurthi
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FREE SPACE OPTICSFREE SPACE OPTICSA NEXT GENRATION WIRELESS
COMMUNICATION
Presented By
B. Chandu AVINASHG.V.P college of engg.M . Naga
SRINIVASJ.N.T.U KAKINADA
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OVERVIEWOVERVIEW Deals with FSO – a latest communication
technique
Used in MAN’s
Transmission through air
Doesn’t involve optical fibers
Uses INFRARED RAYS
Doesn’t involve jamming
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CHALLENGE CHALLENGE AND AND IT’S IT’S
SOLUTIONSOLUTION
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BASICSBASICSOptical wireless
Different topologies
Involves transmission of data, voice and video
Many advantages when compared to fibers
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TOPOLOGIESTOPOLOGIES
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MESH POINT TO MULTI POINT
POINT TO POINT RING TOPOLOGY
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IS FSO OPTICAL OR IS FSO OPTICAL OR WIRELESS?WIRELESS?
Shares some concepts of fiber optics
wavelength’s 850nm to 1550 nm
laser and amplifiers
Sending and receiving is done by
OPTICAL-ELECTRICAL-OPTICAL [O-E-O]
presently
FSO can scale easily ultra bandwidth’s6
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EDFAEDFA
EDFA-Erbium Doped Fiber Amplifier
A path way for high wavelengths and
longer distances
Less expenses for [O-E-O] conversion and
electrical amplification for each wavelength
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BANDWIDTH BANDWIDTH DRIVERS/TRENDSDRIVERS/TRENDS
Helps to attain high bandwidths
Telecommunication carriers implement FSO
as best access technology
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USAGE AND SPEED OF THE FSO AT VARIOUS APPLICATIONS
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FEATURESFEATURESFULLDUPLEX (bidirectional)
Uses lenses, optical wireless
unit, telescope for transmission
Very sensitive transmission
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DESIGN ISSUESDESIGN ISSUES
Apertures are used
Follows reflection,
refraction, diffraction,
combination of all
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TRANSMITTER APERTURETRANSMITTER APERTURE
Important aspects
Size
Quality
Size determines maximum eye safe laser
Quality with f-number tells us minimum divergence
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RECIEVER APERTURERECIEVER APERTURE
Follows aperture size and f-number
Aperture size gives amount of collected
data
f-number gives the detector field of view
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FSO SYSTEMSFSO SYSTEMS
Doesn’t require any license
Wavelength is about 1micrometer
1 micrometer beam can translate into frequencies
of several hundred terahertz
Better than the micro wave transmission (40gHz)
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FSO SYSTEMS(Contd…)FSO SYSTEMS(Contd…)
Divergence of 0.3 for distance of 1 KM
4mts diameter of beam
Those values are much more better than the radial beams, micro beams
Since it works in free space it needs little maintenance
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SECURITYSECURITY
Transmission is not
visible to human eye
Difficult for intruder to
get IR beam by direct
method since beam is
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SECURITY(Contd…)SECURITY(Contd…)
Transmission beam passes
well above the ground level
It is impossible for an
intruder by indirect method
by using light photons since
IR has low power levels
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DRIVING FORCEDRIVING FORCEIncludes
Market driver
Economic driver
Service driver
Business driver
Environment driver
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APPLICATIONSAPPLICATIONS
Metro network extensions
to connect to new networksEnterprise
LAN-LAN connectivityEnterprise applicationsPoint to multipoint
Fiber complementAs redundant link
DWDM Services
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CHALLENGESCHALLENGESPhysical obstructionsBuilding seismic
activityScintillationAbsorptionBeam wanderBeam spreadingSafety
Human exposure to laserHigh voltages
Weather Severity
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EFFECT OF ATMOSPHEREEFFECT OF ATMOSPHERE
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CONCLUSIONCONCLUSION
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FSO allows us to provide optical
connectivity cost effectively, quickly,
reliably and is a most secured data
transmission technology.
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REFERENCESREFERENCES
Mendelson , James S. and Dorrier , Charles R. “Free Space
Optics: Fixed Wireless Broadband”
White, Chad “How to Squeeze More Data Over What’s
Already There ”
www.laseroptronics.com
www.ieee.org
www.science tech.com
www.efymag.com
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ANY QUERIES?ANY QUERIES?
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THANK YOUTHANK YOU
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