smart dust active laser transmitter salt
Download
Skip this Video
Download Presentation
Smart dust Active Laser Transmitter (SALT)

Loading in 2 Seconds...

play fullscreen
1 / 13

Smart dust Active Laser Transmitter SALT - PowerPoint PPT Presentation


  • 132 Views
  • Uploaded on

Smart dust Active Laser Transmitter (SALT). Matthew Last, Kris Pister Berkeley Sensor and Actuator Center http://www.eecs.berkeley.edu/~mattlast. Smart dust Active Laser Transmitter (SALT). Free-space Communication Low-frequency Beam Steering (DC -> 1kHz).

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Smart dust Active Laser Transmitter SALT' - omer


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
smart dust active laser transmitter salt

Smart dust Active Laser Transmitter (SALT)

Matthew Last, Kris Pister

Berkeley Sensor and Actuator Center

http://www.eecs.berkeley.edu/~mattlast

smart dust active laser transmitter salt1
Smart dust Active Laser Transmitter (SALT)
  • Free-space Communication
  • Low-frequency Beam Steering (DC -> 1kHz)
free space communication using agile beamsteering
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 = 318kW/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 2
Free-Space Communication using Agile Beamsteering (2)
  • 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
long range low power crosslinks
Long Range, Low Power Crosslinks

3 mWoptical power:

  • 5.2 km Berkeley Marina
  • 15.3 km Coit Tower
  • 21.4 km Twin Peaks

And plenty of power to go further…

ongoing projects
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)
fun numbers
Fun Numbers:
  • divergence = 1.22 /d
    • 1mm aperture @ 650nm  .79 mrad divergence
    • 1mrad divergence @ 650nm  .79mm aperture
  • 1mW 1mrad emitter puts out 40 times more power/steradian than a 100 W bulb
ad