Spurthi
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Transcript of Spurthi
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
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
3
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
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
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)
14
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
small16
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.
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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