Abstract:To understand an underwater optical communication, it is necessary to describe the optical path
of the light underwater and the refractive index of water. In the present work the receiver signal power
underwater has been calculated using free space optical wireless communication formula. This procedure
has been used to calculate the link margin, data rate as a function of the distance link. Types of water have
been taken in the consideration. Our results show that the signal to noise ratio most parameter in
communication systems in the distance link, particularly for the refractive index n ≤ 1.4. The data rate,
signal to noise ratio decreases as the refractive index of water and distance link increases.
Keywords: Refractive index of water, optical path, underwater communication, data rate, signal to noise
ratio.
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