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Free WIRELESS COMMUNICATION (FSO) Presentations in PowerPoint format
ABSTRACT
- Communication through optics using latest technology called Free Space Optics (FSO)
- FSO does not require cable and can withstand radio jamming.
- Aim – To use FSO as a complement to fiber optics.
INTRODUCTION TO THE CONCEPT OF FREE SPACE OPTICS
- FSO is a line-of-sight technology which uses LASERS and Photo detectors to provide optical connections between two points—without the fiber.
ADVANTAGES OF FSO COMPARED TO OTHER TECHNIQUES
- Lower cost.
- FSO can be easily deployed.
- Bandwidth can easily be scaled.
FSO: OPTICAL OR WIRELESS?
- FSO share several characteristics with fiber optics.
- It uses the same optical transmission wavelength and components as fiber optics.
- Important breakthrough in FSO is the invention of Erbium Doped Fiber Amplifier (EDFA).
HOW IT WORKS ?
- It is based on connectivity between FSO based optical wireless units.
- Each consisting of an optical transceiver to provide full duplex capabilities.
FREE SPACE OPTICS SUBSYSTEMS
- On the transmitting side the important aspects are size and quality of the system.
- On the receiving side the important aspects are the aperture size and the f-number.
DATA SECURITY
- In FSO an infrared beam slightly above the visible spectrum is used hence it is invisible to the normal human eyes.
- Any attempt to interrupt the beam is possible only near the receiver terminus as it passes in a line of sight which is invisible.
FSO CHALLENGES:
- Fog.
- Absorption.
- Scattering.
- Physical obstructions.
- Building activity.
- Safety.
- Scintillation.
ADVANTAGES OF FSO SYSTEMS
- Installation cost is very low as compared to laying Fiber.
- Highly secure transmission possible.
- High data rates, upto 2.5 Gbps at present and 10 Gbps in the near future.
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