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TZID:Asia/Hong_Kong
X-LIC-LOCATION:Asia/Hong_Kong
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TZOFFSETFROM:+0800
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DTSTART:19911015T033000
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BEGIN:VEVENT
DTSTAMP:20251218T030656Z
LOCATION:Meeting Room S423+S424\, Level 4
DTSTART;TZID=Asia/Hong_Kong:20251217T164000
DTEND;TZID=Asia/Hong_Kong:20251217T165100
UID:siggraphasia_SIGGRAPH Asia 2025_sess144_papers_1197@linklings.com
SUMMARY:Underwater Optical Backscatter Communications using Acousto-Optic 
 Beam Steering
DESCRIPTION:Atul Rohit Agarwal, Dhawal Sirikonda, and Atharv Agashe (Dartm
 outh College); Ziang Ren (Columbia University); Dinithi Silva-Sassaman (Da
 rtmouth College); Charles Carver (Columbia University); Alberto Quattrini 
 Li (Dartmouth College); Xia Zhou (Columbia University); and Adithya Pedire
 dla (Dartmouth College)\n\nWe present a high-speed underwater optical back
 scatter communication technique based on acousto-optic light steering. Our
  approach enables underwater assets to transmit data at rates potentially 
 reaching hundreds of Mbps, vastly outperforming current state-of-the-art o
 ptical and underwater backscatter systems, which typically operate at only
  a few kbps. In our system, a base station illuminates the backscatter dev
 ice with a pulsed laser and captures the retroreflected signal using an ul
 trafast photodetector. The backscatter device comprises a retroreflector a
 nd a 2 MHz ultrasound transducer. The transducer generates pressure waves 
 that dynamically modulate the refractive index of the surrounding medium, 
 steering the light either toward the photodetector (encoding 1) or away fr
 om it (encoding 0). Using a 3-bit redundancy scheme, our prototype achieve
 s a communication rate of approximately 0.66 Mbps with an energy consumpti
 on of <1 µJ/bit, representing a 60X improvement over prior techniques. We 
 validate its performance through extensive laboratory experiments in which
  remote underwater assets wirelessly transmit multimedia data to the base 
 station under various environmental conditions.\n\nRegistration Category: 
 Full Access, Full Access Supporter\n\nSession Chair: Seung-Hwan Baek (POST
 ECH)\n\n
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