Abstract

The performances of four refractive concentrators in enhancing LED source-to-multimode fiber coupling are compared on the basis of improvement of coupling efficiency and relaxation of source-fiber mechanical alignment tolerances. For a core-to-source area ratio of 1.9 and a parabolic index, 0.23-N.A. fiber, experiments indicated a coupling improvement factor over butt coupling of up to 1.6, and alignment tolerance improvement factors of up to 10 (axial) or 5 (lateral) by use of an appropriate concentrator. An experimentally verified ray trace numerical simulation was used to examine the effects of fiber N.A., core area, and concentrator refractive index.

© 1979 Optical Society of America

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