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Thomas A. Eppes, U S Patent 4,465,335, ‘Concentric Core Optical Fiber Coupler’

The patent covers a method for constructing an input coupler for a concentric core optical fiber. The outer protective material is removed to expose the outer core back a predetermined distance from the end including the intermediate protective material or cladding and the inner core. A plurality of single core optical fibers are stripped so that their respective cores are exposed whereupon they are bonded to the exposed outer core by a transparent index matching epoxy, which bonding is located at the transition region where the exposed outer core begins and the outer cladding ends. The outer end of the concentric core fiber element including the intermediate protective material and the inner core is cleaved and at least one other single core optical element is cleaved and bonded in end to end abutting relationship with the inner core by transparent index matching epoxy.