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FREE SPACE OPTICS

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FREE SPACE OPTICS

  1. 1. FREE SPACE OPTICSFREE SPACE OPTICS A NEXT GENRATION WIRELESS COMMUNICATION Presented By B. Chandu AVINASH G.V.P college of engg.M . Naga SRINIVAS J.N.T.U KAKINADA
  2. 2. 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
  3. 3. CHALLENGECHALLENGE ANDAND IT’S SOLUTIONIT’S SOLUTION 3
  4. 4. BASICSBASICS Optical wireless Different topologies Involves transmission of data, voice and video Many advantages when compared to fibers 4
  5. 5. TOPOLOGIESTOPOLOGIES 5 MESH POINT TO MULTI POINT POINT TO POINT RING TOPOLOGY
  6. 6. 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
  7. 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. 8. BANDWIDTH DRIVERS/TRENDSBANDWIDTH DRIVERS/TRENDS Helps to attain high bandwidths Telecommunication carriers implement FSO as best access technology 8
  9. 9. USAGE AND SPEED OF THE FSO AT VARIOUS APPLICATIONS 9
  10. 10. FEATURESFEATURES FULLDUPLEX (bidirectional) Uses lenses, optical wireless unit, telescope for transmission  Very sensitive transmission 10
  11. 11. DESIGN ISSUESDESIGN ISSUES Apertures are used Follows reflection, refraction, diffraction, combination of all 11
  12. 12. TRANSMITTER APERTURETRANSMITTER APERTURE Important aspects Size Quality Size determines maximum eye safe laser Quality with f-number tells us minimum divergence 12
  13. 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. 14. 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
  15. 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. 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. 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. 18. DRIVING FORCEDRIVING FORCE Includes Market driver Economic driver Service driver Business driver Environment driver 18
  19. 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. 20. CHALLENGESCHALLENGES Physical obstructions Building seismic activity Scintillation Absorption Beam wander Beam spreading Safety Human exposure to laser High voltages Weather Severity 20
  21. 21. EFFECT OF ATMOSPHEREEFFECT OF ATMOSPHERE 21
  22. 22. CONCLUSIONCONCLUSION 22 FSO allows us to provide optical connectivity cost effectively, quickly, reliably and is a most secured data transmission technology.
  23. 23. 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
  24. 24. ANY QUERIES?ANY QUERIES? 24
  25. 25. THANK YOUTHANK YOU 25

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