03-04-2012, 01:11 PM
Smart dust Active Laser Transmitter
MOEMS99.ppt (Size: 759.5 KB / Downloads: 51)
Free-space Communication
Low-frequency Beam Steering (DC -> 1kHz)
Free-Space Communication using Agile Beamsteering
What do we gain over RF?
High Antenna Gain
Excellent performance: low power, long range, high bit rate
1mrad, 1mW beam = 318 kW/steradian
Isotropic 1mW radiator = 80 W/steradian
Antenna gain of 152 dB for typical laser
No spectrum regulation issues
SDMA (Space-Division, Multiple Access) with imaging receivers
Only simple baseband modulation necessary (OOK)
Free-Space Communication using Agile Beamsteering
When to use?
Need Line of Sight
Need Clear Weather (no fog)
At what cost?
Tight alignment tolerances
Only point-to-point networks (no broadcasting)
Unidirectional links yield asymmetrical networks
Ongoing Projects:
Lenses and lens systems
vary lens diameter
lens quality evaluation?
Laser diode mount
Prototype laser transmitter system (laser diode -> collimating lens -> 2-DOF mirror)