Connector for multiple core optical fiber

A fiber optic plug, suitable for multi-core fiber (MCF), is structured to hold satellite cores of the MCF in a precise angular positions so as to attain suitable alignment with satellite cores of a mating connector. The plug includes features to permit a ferrule (40) holding the MCF to move longitudinally relative to the connector's housing, so that a spring (127) may control a mating force to an abutting ferrule of a mating connector. The ferrule may be held by ferrule barrel (105) having splines (107a-c) projecting away from an outer peripheral surface. The splines may slide longitudinally within notches of the connector housing (109) or of a strength member (not shown) attached to the connector housing. The notches and splines have a tight tolerance, so that the satellite cores remain in a desired, set angular position.