A fiber optic adapter, also known as a fiber coupler, is a passive device used to connect and align two optical fiber connectors. It enables optical signals to pass from one fiber to another with minimal loss, ensuring stable and reliable communication. Unlike active components (transceivers, amplifiers, repeaters). The most common type of fiber optic adapter is the SC (Subscriber Connector) adapter, which is widely used in network installations. The optical fiber adapter can be inserted into.