Abstract: A method for making a fiber-optic bundle collimator assembly, comprising steps of assembling side by side a multiplicity of first bodies of cylindrical configuration and equal diameter and applying uniform compressive force to the first bodies to force the first bodies into a predictable hexagonal pattern of minimum diameter. Additional bodies of cylindrical configuration and having diameters equal to the diameters of the first bodies are inserted on each of the sides of the bundle of first bodies with each of the additional bodies abutting two of the first bodies. A plurality of the first bodies is then removed from the bundle. Each of the removed first bodies is replaced with a pair of cylindrically-shaped second bodies having diameters equal to the diameters of the first bodies, with one of the pair protruding from the bundle on a first face thereof and another of the pair protruding from the bundle on a second face thereof.

Abstract: A multi-channel fiber optic rotatable interconnection system for coupling tical signals from a plurality of diverse optical signal sources at a source location to a like plurality of optical signal receivers at a destination location rotatable relative to each other. The interconnection system comprises an input fiber and an output fibber both of which are comprised of step-index multi-mode optical fibers. The input fiber includes an input end which receives optical signals from the optical signal sources, the fiber forming a composite optical signal therefrom. The optical signal sources are positioned at diverse polar angles relative to the input end of the input fiber to provide a plurality of optical transmission modes having minimal crosstalk, so that the composite optical signal can be resolved into its component optical signals at the destination.

Abstract: A mode transition matrix measuring system for nondestructively calculating mode-dependent losses and coupling of a multi-mode, graded-index, connectorized, passive fiber optic component, the mode transition matrix measuring system comprising mode selective launcher means having a plurality of optical paths with varying launch conditions, input-output optic means having at least one reference optical path and at least one optical path for the passive fiber optic component under test, mode selective detection means having a plurality of optical paths with a variety of mode filters, and means for data storage and matrix calculation, wherein the mode transition matrix and the modal power vector are calculated using measurements of the optical power propagated through optical courses comprising the optical paths.