Wireless optical communication system
Transcript of Wireless optical communication system
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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