Seabed surveillance telecommunications network based on subsea cable and wireless platforms

A seabed surveillance telecommunications network can perform all long-term, continuous, real-time functions by applying a variety of techniques, including seabed cable assemblies, stand-alone stations, as well as mobile platforms, where reliable high-speed underwater wireless communications become the main foundation. Recently, underwater wireless optical communication (UWOC) has become a very productive solution and is becoming more attractive in terms of scientific research. The article shows the option of using a high-speed UWOC system for deep-sea surveillance. Long-duration, real-time deepsea UWOC connection up to 30 m and 1650 m deep. UWOC dual-layer Ethernet links are implemented at 125 Mbit/s with configurable green light and 6.25 Mbit/s blue without line of sight (NLOS). High-quality transmission of video files in 8K 30 FPS and 4K 120 FPS format using an underwater optical communication line with a data transfer rate of up to 125 Mbps is possible provided that the transmitter emits green light, which indicates the reception of video without bit errors. Technical measurements carried out within 30 days show that the values of the error coefficient per BER bit of the specified line at speeds of 125 Mbit/s and 6.25 Mbit/s are below the threshold of 10-5, and this, in turn, characterizes the functioning of UWOC with a high degree of reliability in the layers of the hydrosphere up to 1650 m deep.