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Single-mode fiber with a plano–convex silicon microlens for an integrated butt-coupling scheme

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Abstract

A single-mode fiber with plano–convex silicon microlens is proposed for butt-coupling between single-mode fibers and high-index-contrast waveguides with fine mode-field diameter. The lensed fiber has two specific features, high focusing power, and null working distance. The theoretical focus-spot diameter at the endface of the lensed fiber is calculated to be as small as 0.56μm at a wavelength 1.55μm. A simple fabrication method for the lensed fiber employing chemical etching and rf-sputtering is presented. Experiments showed that the mode-field-diameter of a single-mode fiber was successfully contracted from 10.5 to 1.3μm with the lensed fiber.

© 2008 Optical Society of America

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