25 September 2007 Optical wireless communications with low voltage self-powered sensor motes
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Abstract
Optical wireless channels that use modulated retro-reflectors can provide low-data rate communications to self-powered 'smart-dust' motes. The retro-reflectors are illuminated using a base station that incorporates diffractive beamsteering to direct radiation onto the motes, and these return the radiation to an imaging receiver within the base station. The motes consist of a photodiode to provide power, a novel logarithmic receiver to receive data from the base station, and a modulating retro-reflector to send information from the mote to the base station. Several of the components elements of this system have been implemented and tested. In this paper we report a logarithmic receiver that can be self powered by the source communicating with it, and a retro-reflecting LC modulator component that operates at 30b/s when driven at 0.7V. In addition an overall system model, together with the challenges for future work are presented.
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Dominic C. O'Brien, Dominic C. O'Brien, Jing-Jing Liu, Jing-Jing Liu, Wei Wen Yuan, Wei Wen Yuan, Grahame E. Faulkner, Grahame E. Faulkner, Steve J. Elston, Steve J. Elston, Steve Collins, Steve Collins, } "Optical wireless communications with low voltage self-powered sensor motes", Proc. SPIE 6709, Free-Space Laser Communications VII, 67090A (25 September 2007); doi: 10.1117/12.735599; https://doi.org/10.1117/12.735599
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