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INTRODUCTION Replace radio waves with beams of light .Works in the infrared or near infrared regionof light .Consists of transreceiver.
Optical Intensity Modulation Direct Detection
Channel Topologies Point-to-Point LinkDiffuse linkQuasi Diffuse Link
Direct‚ unobstructed path between a transmitter and a receiver. Sensitive to Blocking and shadowing.
Radiate optical power over a wide solid angle. Provide mobility to the receiver. High path loss.
Inheritaspects of both point-to-point and diffuse links. Slowly diverging beam sources which illuminate a grid of spots on the ceiling.
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
LIGHT WAVE RADIO WAVEBANDWIDTH VIRTUALLY UNLIMITED LIMITED BANDWIDTHPASSES THROUGH NO YESWALLCOST LOW HIGHSPEED HIGH LOW
Short range (cm – m) Chip-to-Chip Interface Medium range (m – 10 m) Wireless Optical LAN Long range (km) Free-Space Optical Communications
It can be used to illuminate the room while serving as a medium for data transfer.
Itcan be used to transfer data at high speed for long distance
It can be used for high speed long distance data transfer using satellite.
Without any licensing hurdle provide high speed and high bandwidth communication.
REFERENCES R. Gfeller and U. Bapst. Wireless in-house communication via diffuseinfrared 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 WirelessInfrared Communications. Kluwer Academic Publishers, Boston, MA,1999.S. Hranilovic. Spectrally Efficient Signalling for Wireless OpticalIntensity Channels. PhD thesis, Dept. of Elec. & Comp. Engineering,University of Toronto, 2003.