Underwater Wireless Optical Communication and Underwater Solid-State Lighting Based on RGB Laser Diodes Mixed White-Light

This study proposed and experimentally demonstrated white-light source by mixing red, green and blue laser diodes (RGB-LDs) for wavelength-division multiplexing (WDM)-based high-speed underwater wireless optical communication (UWOC) and large-area underwater solid-state lighting (SSL) simultaneously. The communication performance and underwater white-light SSL quality were investigated experimentally at an underwater transmission distance of 2.3 m. For each LD, an on-off keying (OOK) scheme was employed. To achieve both high-speed UWOC and large-area underwater SSL, optical filters and optical diffuser were employed. Aggregate data rate of 6.6 Gbps and the Commission Internationale de L'Eclairage (CIE) coordinates of (0.3298, 0.3390) were obtained. In addition, owning to the water attenuation, the underwater white-light SSL characteristics under various distances were studied in theory.