23-06-2012, 01:56 PM
WHAT IF I TRANSMIT LIGHT WITHOUT OPTICAL FIBRE
OPTICAL FIBRE.pptx (Size: 839.89 KB / Downloads: 43)
Outdoor implementation :-
Attenuation – Most Important
Atmospheric Loss (varies with weather)
0.2 dB/km in exceptionally clear weather
300 dB/km in very dense fog
Restricts the range (~500m in most commercial systems)
May need low capacity back-up RF links
Scintillation Noise (atmospheric turbulence induced intensity fluctuations) – speckled pattern
Alignment Issues – Line of sight
Interference
Sunlight (~ 6000 K)
Advantages of FSO :-
Link capacity:-
capable of sending up to 1.25 Gbps of data, voice, and video communications simultaneously through the air
enables optical communications at the speed of light
full-duplex Gigabit Ethernet throughout
WDM(wavelength division multiplexing) leading upto 10Gbps connectivity.
Application-FSO :-
LAN-to-LAN connections on campuses at Fast Ethernet or Gigabit Ethernet speeds
LAN-to-LAN connections in a city- Metropolitan area network.
Converged Voice-Data-Connection
Temporary network installation (for events or other purposes).
Re-establish high-speed connection quickly (disaster recovery).
Conclusions :-
Short distance connectivity.
Atmospheric condition dependency.
Higher speed and bandwidth.
Immune to data loss.
Highly secure.
Fast temporary installation.
Free of cost spectrum.