Optical fiber beam splitter coupler

摘要

The optical fiber beam splitter coupler disclosed includes in the first half thereof a first optical fiber having a first core coaxial of a longitudinal axis and a first cladding disposed concentric to and outside the first core. The second half of the coupler includes a concentric core fiber having an inner core coaxial of the longitudinal axis, an inner cladding concentric to and outside the inner core, an outer core concentric to the inner cladding and an outer cladding concentric to the outer core. The adjacent ends of the first fiber and the concentric fiber are polished at 45 DEG angles complementary to one another and are abutted end-to-end to provide an interface therebetween. A mirror surface is deposited on the interface so as to cover either the adjacent end of the outer core or the inner core of the concentric fiber. This arrangement enables the coupling of two different light beams into and/or out of the coupler. Several embodiments are disclosed.