GUIDE- MADE BY-

MS. PINKI NAYAK VIBHU

MS. BINDU E. 00910497610

INTRODUCTION Replace radio waves with beams of light . Works in the infrared or near infrared region of light . Consists of transreceiver.

Optical Intensity Modulation

Direct Detection

Channel Topologies

Point-to-Point Link

Diffuse link Quasi 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.

Inherit aspects of both point-to-point and diffuse links.

Slowly diverging beam sources which

illuminate a grid of spots on the ceiling.

Advantages Low cost, base-band

circuit design

High date rates (Gbps) less multi access

interference

No need to pay for spectrum license

Disadvantages

Cannot pass through walls Sensitive to blocking

Limited Transmit Power

LIGHT WAVE RADIO WAVE

BANDWIDTH VIRTUALLY UNLIMITED LIMITED BANDWIDTH

PASSES THROUGH WALL

NO YES

COST LOW HIGH

SPEED 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.

It can 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 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]

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