5. Direct‚
unobstructed path between a
transmitter and a receiver.
Sensitive to Blocking and shadowing.
6. Radiate optical power over a wide solid
angle.
Provide mobility to the receiver.
High path loss.
7. Inheritaspects of both point-to-point and
diffuse links.
Slowly diverging beam sources which
illuminate a grid of spots on the ceiling.
8. Advantages Disadvantages
Low cost, base-band Cannot pass through walls
circuit design
Sensitive to blocking
High date rates (Gbps)
Limited Transmit Power
less multi access
interference
No need to pay for
spectrum license
9. LIGHT WAVE RADIO WAVE
BANDWIDTH VIRTUALLY UNLIMITED LIMITED BANDWIDTH
PASSES THROUGH NO YES
WALL
COST LOW HIGH
SPEED HIGH LOW
10. Short range (cm – m)
Chip-to-Chip Interface
Medium range (m – 10 m)
Wireless Optical LAN
Long range (km)
Free-Space Optical Communications
11. It can be used to illuminate the room while
serving as a medium for data transfer.
12. Itcan be used to transfer data at high speed
for long distance
13. It can be used for high speed long distance
data transfer using satellite.
14. Without any licensing hurdle provide high
speed and high bandwidth communication.
15. REFERENCES
R. Gfeller and U. Bapst. Wireless in-house communication via diffuse
infrared radiation. Proceedings of the IEEE, 67(11): 1474–1486,
November 1979.
J. R. Barry. Wireless Infrared Communications. Kluge Academic
Publishers, Boston, MA, 1994 .
R. Otte , L. P. de Jong and A. H. M. van Roermund. Low-Power Wireless
Infrared Communications. Kluwer Academic Publishers, Boston, MA,
1999.
S. Hranilovic. Spectrally Efficient Signalling for Wireless Optical
Intensity Channels. PhD thesis, Dept. of Elec. & Comp. Engineering,
University of Toronto, 2003. [1]
