Analysis of underwater communication systems based on hybrid Li-Fi technology

Communicating underwater is hard because signals weaken, light scatters, bends, and takes multiple paths. Acoustic links can reach far, but they are slow and carry little data. Optical wireless (Li‑Fi) is fast, yet it works only over short distances and is affected by cloudy water. To solve these problems, we study a hybrid system that combines optical and acoustic links. Using Li‑Fi’s speed together with acoustic’s range, the system tries to keep a steady, real‑time data connection between autonomous underwater vehicles (AUVs) and surface stations. The research looks at physical limits such as energy absorption and tests adaptive signal‑processing methods that can adjust link quality on the fly. Important design

choices are examined, including: – the best laser wavelength, and – how to tune the photodetector These choices aim to maximize data throughput. The paper describes the theoretical network layout and compares the performance of each channel, but it does not include real‑world test data for different water clarity levels. It also offers guidance on how to structure and simulate hybrid underwater links.

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