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free space optics
 

free space optics

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    free space optics free space optics Presentation Transcript

    • FREE SPACE OPTICSFREE SPACE OPTICS A NEXT GENRATION WIRELESS COMMUNICATION Presented By K. Venkat RAO M.L.E.C.J.U.V.Abhinay KUMAR M.L.E.C
    • 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 2
    • CHALLENGECHALLENGE ANDAND IT’S SOLUTIONIT’S SOLUTION 3
    • BASICSBASICS Optical wireless Different topologies Involves transmission of data, voice and video Many advantages when compared to fibers 4
    • TOPOLOGIESTOPOLOGIES 5 MESH POINT TO MULTI POINT POINT TO POINT RING TOPOLOGY
    • IS FSO OPTICAL OR WIRELESS?IS FSO OPTICAL OR 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’s 6
    • 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 7
    • BANDWIDTH DRIVERS/TRENDSBANDWIDTH DRIVERS/TRENDS Helps to attain high bandwidths Telecommunication carriers implement FSO as best access technology 8
    • USAGE AND SPEED OF THE FSO AT VARIOUS APPLICATIONS 9
    • FEATURESFEATURES FULLDUPLEX (bidirectional) Uses lenses, optical wireless unit, telescope for transmission  Very sensitive transmission 10
    • DESIGN ISSUESDESIGN ISSUES Apertures are used Follows reflection, refraction, diffraction, combination of all 11
    • TRANSMITTER APERTURETRANSMITTER APERTURE Important aspects Size Quality Size determines maximum eye safe laser Quality with f-number tells us minimum divergence 12
    • RECIEVER APERTURERECIEVER APERTURE Follows aperture size and f-number Aperture size gives amount of collected data f-number gives the detector field of view 13
    • 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 15
    • SECURITYSECURITY  Transmission is not visible to human eye  Difficult for intruder to get IR beam by direct method since beam is small 16
    • 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 17
    • DRIVING FORCEDRIVING FORCE Includes Market driver Economic driver Service driver Business driver Environment driver 18
    • APPLICATIONSAPPLICATIONS Metro network extensions to connect to new networks Enterprise LAN-LAN connectivity Enterprise applications Point to multipoint Fiber complement As redundant link DWDM Services 19
    • CHALLENGESCHALLENGES Physical obstructions Building seismic activity Scintillation Absorption Beam wander Beam spreading Safety Human exposure to laser High voltages Weather Severity 20
    • EFFECT OF ATMOSPHEREEFFECT OF ATMOSPHERE 21
    • CONCLUSIONCONCLUSION 22 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 23
    • ANY QUERIES?ANY QUERIES? 24
    • THANK YOUTHANK YOU 25