How do submarine cables work? underwater submarine optical fiber cable Submarine optical cables are actually optical fibers, which use the propagation characteristics of light in optical fibers to transmit data. However, the submarine optical cable is not a simple optical fiber, it is actually a complex transmission system. The submarine optical cable system consists of two parts: underwater equipment and shore equipment. Underwater equipment It mainly includes optical cable, optical amplifier/repeater and underwater branch unit. What is the repeater used for? As we all know, despite the high speed and sufficient bandwidth of optical fiber, the signal transmission distance is...