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Free space optical communication
Free space optical communication (FSO) utilizes line-of-sight transmission of modulated light for broadband connectivity, addressing gaps in communication networks and offering cost-effective solutions. The technology boasts advantages such as ease of deployment and high bit rates while facing challenges like atmospheric interference. Applications include LAN connections, disaster recovery, and temporary installations, providing speeds up to 1.25 Gbps, with potential future enhancements.
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Free space optical communication
- 1. P A RA G J . T A R W A D I , I S H W A R V . B H O G E 1 . p t a r w a d i @ y a h o o . c o m , 2 . b h o g e i 0 0 7 @ g m a i l . c o m Free space optical communication Presented by :-
- 2. Contents:- 1. Introduction 2. Communication network 3.Free-Space path loss 4.Why to use free space optical communication 5. Challenges in technology implementation 6.Application 7. Conclusion
- 3. Introduction Free space optical communicationsis a line-of-sight (LOS) technology that transmits a modulated beam of visible or infrared light through the atmosphere for broadband communications.
- 4. COMMUNICATION NETWORKSFree-space optics technology(FSO) has several applications in communications networks, where a connectivity gap exists between two or more points. FSO technology delivers cost-effective optical wireless connectivity and a faster return on investment (ROI) for Enterprises and Mobile Carriers. With the ever increasing demand for greater bandwidth by Enterprise and Mobile Carrier subscribers comes a critical need for FSO-based products for a balance of throughput, distance and availability.
- 5. Topologies Light Pointe’soptical wireless products, based on the latest in FSO technology, are designed and engineered to work in any network topology, including point-to-point, mesh, point-to- multipoint, and ring with spurs. FSO-based products enable cost-effective deployment and the highest throughput with same-day connections possible from roof-to- roof, roof-to-window and window-to-window all without tearing up streets and sidewalks.
- 6. RONJA Transceiver Optical Receiver Optical Transmitter Block Diagram ofRONJA Nebulus infrared LED driver. It is an optical Ethernet transceiver without the optical drive part. Preamplifier stage. The usual approach in FSO preamplifiers is to employ a transimpedance amplifier. Reasonable Optical near Joint Access (RONJA) is a Free Space Optics device. It transmits data wirelessly using beams of light. The range of the basic configuration is 1.4 km (0.9 miles)
- 7. FREE-SPACE PATH LOSS Where: •λ = is the signal wavelength (in meters), • f = is the signal frequency (in hertz), • d= is the distance from the transmitter (in meters), • c = is the speed of light in a vacuum, 2.99792458 × 108 meters per second. This equation is only accurate in the far field; it does not hold close to the transmitter In telecommunication, free-space path loss (FSPL) is the loss in signal strength of an electromagnetic wave that would result from a line- of-sight path through free space, with no obstacles nearby to cause reflection or diffraction. The equation for FSPL is,
- 8. Advantages • Ease ofdeployment • License-free operation • High bit rates • Low bit error rates • Immunity to electromagnetic interference • Full duplex operation • Protocol transparency Disadvantages • Beam dispersion • Atmospheric absorption • Rain • Fog (10...~100 dB/km attenuation) • Snow • Pointing stability in wind • Pollution / smog • If the sun goes exactly behind the transmitter, it can swamp the signal. WHY TO USE FREE SPACE OPTICAL COMMUNICATION
- 9. • significant reduction in beam intensity •fluctuation s in signal amplitude • causes a decrease in the power density • hinder the passage of light Fog Absorption ScatteringScintillation CHALLENGES IN TECHNOLOGY IMPLIMENTATION
- 10. APPLICATIONS 1. LAN-to-LAN connections on campusesat Fast Ethernet or Gigabit Ethernet speeds.
- 11. APPLICATIONS 2. LAN-to-LAN connections ina city. Example, Metropolitan area network.
- 12. APPLICATIONS 3. To crossa public road or other barriers which the sender and receiver do not own.
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- 14. APPLICATIONS 5. Temporary network installation(for events or other purposes).
- 15. APPLICATIONS 6. Reestablish high- speedconnection quickly (disaster recovery).
- 16. CONCLUSION: 1. Optical wireless,based on FSO-technology, is an outdoor wireless product category that provides the speed of fiber, with the flexibility of wireless. 2. It enables optical transmission at speeds of up to 1.25 Gbps and, in the future, is capable of speeds of 10 Gbps using WDM. 3. Optical wireless also eliminates the need to buy expensive spectrum (it requires no FCC), which further distinguishes it from fixed wireless technologies.
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