This connector was first by Japan NTT research. FC is the abbreviation of FERRULE CONNECTOR shows the external strengthening is a metal, fastened to the TURNBUCKLE. First, FC type connectors used in the butt end of the PIN. This type of connector is simple in structure, convenient operation, easy manufacture.
But the dust-sensitive fiber end face and easy to produce Fresnel reflection, improve return loss performance more difficult. Later, this type of connector is improved, butt-end surface of a spherical pin (PC), while the outer structure has not changed, the insertion loss and return loss performance has been greatly improved.