Abstract
We report what to our knowledge is the first theoretical pre- diction of the efficiency of coupling of a laser diode to an elliptic-core single-mode step-index fiber via a hyperbolic lens on the tip of the fiber. Based on the formulated ABCD matrix for refraction under paraxial ap- proximation, we present analytical expressions for such coupling effi- ciencies and evaluate them, involving very little computation. Elliptic-core single-mode fibers have already attracted a great deal of attention for their applications in the conservation of polarizations, and so this analy- sis will be extremely important in coherent optical communications, fiber optic sensors, etc. In addition, if due to constructional problems there is noncircularity in a circular core fiber, such analysis will take care of the resulting noncircularity in the process of designing optimum launch optics. 2007 Society of Photo-Optical Instrumentation Engineers. DOI: 10.1117/1.2538140
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