Abstract: The present invention provides an improved fiber optic holding fixture for an optical interferometer, which can be used with a connector ferrule or a combination of an optical fiber end surrounded by a connector ferrule. The fiber optic holding fixture comprises a holding plate suitable for use in an optical interferometer, with a holding means for holding a prepared end of an optical fiber connection in a precision, repeatable orientation, with reference to a reference surface. The holding means comprises a vee-shaped groove in the holding plate which provides contact on two points of the circumference of a connector ferrule, as is known to the art. The improvement comprises a clamping means integrally formed within the holding plate which cooperates with the holding means.