1. 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

2. OVERVIEWOVERVIEW Deals with FSO a latest communication technique Used in MANs Transmission through air Doesnt involve optical fibers Uses INFRARED RAYS Doesnt involve jamming 2 3. CHALLENGECHALLENGE ANDAND ITS SOLUTIONITS SOLUTION 3 4. BASICSBASICS Optical wireless Different topologies Involves transmission of data, voice and video Many advantages when compared to fibers 4 5. TOPOLOGIESTOPOLOGIES 5 MESH POINT TO MULTI POINT POINT TO POINT RING TOPOLOGY 6. IS FSO OPTICAL OR WIRELESS?IS FSO OPTICAL OR WIRELESS? Shares some concepts of fiber optics wavelengths 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 bandwidths 6 7. 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 8. BANDWIDTH DRIVERS/TRENDSBANDWIDTH DRIVERS/TRENDS Helps to attain high bandwidths Telecommunication carriers implement FSO as best access technology 8 9. USAGE AND SPEED OF THE FSO AT VARIOUS APPLICATIONS 9 10. FEATURESFEATURES FULLDUPLEX (bidirectional) Uses lenses, optical wireless unit, telescope for transmission Very sensitive transmission 10 11. DESIGN ISSUESDESIGN ISSUES Apertures are used Follows reflection, refraction, diffraction, combination of all 11 12. TRANSMITTER APERTURETRANSMITTER APERTURE Important aspects Size Quality Size determines maximum eye safe laser Quality with f-number tells us minimum divergence 12 13. 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 14. FSO SYSTEMSFSO SYSTEMS Doesnt 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 15. 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 16. SECURITYSECURITY Transmission is not visible to human eye Difficult for intruder to get IR beam by direct method since beam is small 16 17. 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 18. DRIVING FORCEDRIVING FORCE Includes Market driver Economic driver Service driver Business driver Environment driver 18 19. 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 20. CHALLENGESCHALLENGES Physical obstructions Building seismic activity Scintillation Absorption Beam wander Beam spreading Safety Human exposure to laser High voltages Weather Severity 20 21. EFFECT OF ATMOSPHEREEFFECT OF ATMOSPHERE 21 22. CONCLUSIONCONCLUSION 22 FSO allows us to provide optical connectivity cost effectively, quickly, reliably and is a most secured data transmission technology. 23. REFERENCESREFERENCES Mendelson , James S. and Dorrier , Charles R. Free Space Optics: Fixed Wireless Broadband White, Chad How to Squeeze More Data Over Whats Already There www.laseroptronics.com www.ieee.org www.science tech.com www.efymag.com 23 24. ANY QUERIES?ANY QUERIES? 24 25. THANK YOUTHANK YOU 25