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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 (SALT). Free-space Communication Low-frequency Beam Steering (DC -> 1kHz).

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Smart dust Active Laser Transmitter (SALT)

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  1. Smart dust Active Laser Transmitter (SALT) Matthew Last, Kris Pister Berkeley Sensor and Actuator Center http://www.eecs.berkeley.edu/~mattlast

  2. Smart dust Active Laser Transmitter (SALT) • Free-space Communication • Low-frequency Beam Steering (DC -> 1kHz)

  3. 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)

  4. 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

  5. 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…

  6. Current Work

  7. Performance:

  8. Actuation Power - 1st Generation

  9. Actuation Power – 2nd Generation

  10. 2nd Generation Mirror Pictures:

  11. 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)

  12. More Pictures:

  13. 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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