• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.17 no.5
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• pp.382-388
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• 2024

In underwater communications, acoustic signals which have low transmission rate with long communication distance and optical signals which can achieve large-scale data transmission with short distance due to absorption and attenuation have been applied. This paper presents a hybrid optical-acoustic communication model that applies acoustic signals for long distance and optical signals for short distance. In order to apply hybrid model, available optical transmission distance considering ocean turbidity for reliable communication and distance estimation method using acoustic signals are presented. In simulation results, the reliable optical transmission distance in turbid ocean types is within 10m. To estimate distance for optical transmission using acoustic signals, four sensors are required to achieve stable estimation using TDoA method.