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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).

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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…




Actuation power 1 st generation
Actuation Power - 1st Generation


Actuation power 2 nd generation
Actuation Power – 2nd Generation


2 nd generation mirror pictures
2nd Generation Mirror Pictures:


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


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