Fiber Optic Adapter
Definition - What does Fiber Optic Adapter mean?
Techopedia explains Fiber Optic Adapter
Precision mating is done through the alignment sleeves, which are made of either ceramic or metal such as copper in order to provide rigid support for the connectors, whereas the body of the connector itself is made of plastic. There are fiber optic adapters/couplers made for every type of fiber optic connector available.