The FC connector (Ferrule Connector, or Fixed Connection) is a single-mode fiber optic connector distinguished by its threaded screw-lock coupling mechanism. It is commonly used with both single-mode optical fiber and polarization-maintaining optical fiber. The FC Connector pioneered low loss (below 0. According to the estimating, there are hundreds of. While the small size of fibre optic connectors does not mean they play a minor role, the type of connector you use affects the overall efficiency of light transmission across the fibre network. Ensures low return loss (minimal light reflection back into.