The military, industry, and scientists are interested in underwater wireless communication (UWC). It is important for tactical surveillance, pollution monitoring, oil management, and maintenance. Limited bandwidth, capacity, energy efficiency, and transmission delay are the main limitations in UWC. Therefore, complementary technology, such as underwater wireless optical communication (UOWC), will be implemented. This paper designs a prototype using a KY-008 laser module and an Arduino UNO microcontroller with the Arduino IDE platform for software implementations. This prototype used the line-of-sight technique to transfer text data at 2 meters. Results were compared between the wavelength at the beginning of the visible light spectrum and the wavelengths with the minimum attenuation in the same visual, of the transmitting distance and the transmitting power. Optical communication offers higher data rates for effective data transmission and fulfilling the services or challenges requiring higher data rates.

Index Terms- Underwater wireless communication, Integrated optics, Nonlinear optics, Optical fiber communication.