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![Last mile solutions Copper based solution 1.Slower copper based solution eg. ISDN,DDS [ 56 kbps,128 kbps ] 2.Higher copper based solution eg. T-1 circuit [24 channel] T-3 circuit [28 t-1] Security is based on the burying the wires in the grounds Intrusion detection system standpoint is used for undectable purpose](https://image.slidesharecdn.com/599-120127060048-phpapp01/75/Free-space-optical-communication-6-2048.jpg)
![Wireless connection 1. Distribute data everyone ,security is judged by the wep 2. Licence req. To planning & coordination 3. Susceptible To Rain ,Link Length 4. PP microwave provide higher capacity Eg. LMDS Fiber optic based solution 1.Fiber optics are two type A) Single mode [upto 60km]](https://image.slidesharecdn.com/599-120127060048-phpapp01/75/Free-space-optical-communication-7-2048.jpg)
![B)Multi Mode [Upto 2km] 2)Fiber Optics Are Secure Provide speed in terabyte Protected from tapping Imposible to detect light pulse Free space optics 1)No Cables Required 2)Transmitted In Atmosphere 3)Require Line Of Site Availability](https://image.slidesharecdn.com/599-120127060048-phpapp01/75/Free-space-optical-communication-8-2048.jpg)
Uploaded byAkhil Kumar
Free space optical communication
1. The document discusses free space optical communication (FSO), which uses lasers to transmit data through the air instead of cables. 2. FSO has several advantages over traditional wired or wireless networks, including high speeds of up to terabits per second, no licensing requirements, and easy deployment without the need for cables. 3. However, FSO also faces challenges from atmospheric effects like fog, rain, and signal scintillation that can degrade the laser beam over long distances. Proper system design is needed to mitigate these atmospheric effects on the transmission.
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Free space optical communication
- 1. A SEMINAR ONFREE SPACE OPTICAL COMMUNICATION By T venkatesh
- 2. CONTENTS Introduction HistoryHow it works Advantages Challenges System design Transmission security Conclusion
- 3. Introduction Fibre lesslaser driven technology No licensing and frequency coordination required Operating wavelength range 1) 780-900 nm 2) 1500-1600nm Provides a line of sight link Fso links are full duplex Easy to install for last mile &campus
- 4. History of fsoGreeks used sun light for messaging In late nineteenth century graham bell demonstrated it. Used for defence
- 5. Last mile optionsDefinition of last mile Cable Fiber Licenced and unlicenced fixed wireless
- 6. Last mile solutionsCopper based solution 1.Slower copper based solution eg. ISDN,DDS [ 56 kbps,128 kbps ] 2.Higher copper based solution eg. T-1 circuit [24 channel] T-3 circuit [28 t-1] Security is based on the burying the wires in the grounds Intrusion detection system standpoint is used for undectable purpose
- 7. Wireless connection 1.Distribute data everyone ,security is judged by the wep 2. Licence req. To planning & coordination 3. Susceptible To Rain ,Link Length 4. PP microwave provide higher capacity Eg. LMDS Fiber optic based solution 1.Fiber optics are two type A) Single mode [upto 60km]
- 8. B)Multi Mode [Upto2km] 2)Fiber Optics Are Secure Provide speed in terabyte Protected from tapping Imposible to detect light pulse Free space optics 1)No Cables Required 2)Transmitted In Atmosphere 3)Require Line Of Site Availability
- 9. 4)Units are fullduplex 5)No requirement of the license 6)Speed upto tera byte 7)Simplifying Wiring And Cabeling,low Cost 8)No roof space and spectrum license req. 9)Low error rate, high speed
- 10.
- 11. LASER PHOTON DETECTORRECEIVER DIGITAL DATA
- 12. Advantages Fso laserbeam cannot be detected with rf meter or spectrum analyser Los path cannot be intercepted easily Data can be transmitted over an encrypted connection Freedom from licensing and regulation Possble to mount inside the building
- 13. Challenges Atmosphere Physicalobstraction Scientillation Solar interface
- 14. Atmosphere challenge 1.FogIt affect on near infrared wavelength And have same effect as rainfall have on the rf Physical obstructions 1.These can be removed by widely spaced Redundant transmitters and large receive optics
- 15. Scintillation These canbe removed by automatic gain control char.,Tuned received Filtering,clock recovery phase lock Loop time constant Solar interference It can be combated by 1.Long pass optical filter windo 2.Optical Narrowband Filtering
- 16. System design Lineof sight operation Spectral allocation Fso link equation Alternate routing Network topologies Network scalability Coverage area Deploymaent and installation
- 17. System performance Bandwidthand system capacity Absorption and scattering losses Rayleigh scattering Aerosol,particles,& cloud scattering Atmospheric scintillation Fog Service provider cost
- 18. Bandwidth and systemcapacity 1.Fso use on\off keying for modulation eg. Light pointe giga link system 2.Speed 1gbps-160gbps On Per Link Rayleigh scattering It occur due to dust and moleculer particles that are small than wavelength Of laser transmission Scattering losses decreasing by -.4 with increment in wavelength
- 19. Scintillation Due totemp.Difference b/w ground and air And the resulting heat exchange Index change according temp.Diff. Heat exchange cause local index variation that affect the laser propagation Fog Solution Of The Fog Is 1.Link planning 2.Multipath
- 20. Transmission security Toprevent the signal interception we use Directional transmission Broader signal path have chance to intercept the beam in fso beam is very Narrow Absense of side lobes Fso have no side lobs.
- 21. Conclusion FSO networkscan be rapidly deployed to provide immediate service to the customers. Some believe that it may be the unlimited bandwidth solution for the metro urban core of downtown building-to-building communication, as well as the optimal technology for home-to-home and office-to-office connectivity. FSO adds the wireless feature to the OFC and thus provides the high bandwidth requirements.
- 22.