Abstract
We propose an optical coupling scheme that uses a fiber-end lens to achieve efficient coupling of the plastic optical fiber with a light source and with a detector. Transparent resin filled in the concave end of the fiber is fixed by surface tension to form a biconvex lens that is automatically positioned relative to the fiber core. A simple ray-matrix analysis shows that the lensed end yields a large coupling angle with a long working distance range compared to a flat-end fiber. The proposed lensed-end fibers are demonstrated in both input and output proofs of the experiment.
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