Optical Focusing-based Adaptive Modulation for Optoacoustic Communication
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Author/Creator ORCID
Date
2021-11-15
Type of Work
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Citation of Original Publication
M. Mahmud, M. S. Islam, M. Younis and G. Carter, "Optical Focusing-based Adaptive Modulation for Optoacoustic Communication," 2021 30th Wireless and Optical Communications Conference (WOCC), 2021, pp. 272-276, doi: 10.1109/WOCC53213.2021.9603005.
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Subjects
Abstract
Wireless communication from air to underwater is a
longstanding challenge that can be addressed by the optoacoustic
process. We can directly transmit data to underwater submerged
nodes from the air with proper modulation technique by varying
basic laser parameters, e.g., laser focusing angle from air to water.
Laser-induced underwater plasma volume and shape are important
because the duration and directivity of the generated acoustic pulses
depend on these. Non-spherical shaped plasma generates anisotropic
acoustic pressure; thus it is difficult to communicate from air to an
unknown positioned underwater node. In this paper, we analyze how
to control the shape of the plasma and propose an optical focusing-based adaptive modulation (OFAM) technique that enables
transmission to underwater nodes even if the node's position is
unknown. Bit error rates (BER) for different underwater node
positions are analyzed, and the BER performance is compared with
a lower pulse energy laser. Our results indicate that the performance
is better if the underwater node position is in the direction of the laser
beam, also when the laser focusing angle varies the most and a
higher energy laser is used.