Spot size converter and optical apparatus

Abstract

A spot size converter includes a first silicon waveguide core that includes a width-fixed region having a fixed width and a width-tapered region continuing to the width-fixed region and having a width reducing toward a terminal portion, and a second waveguide core continuing to the first silicon waveguide core and covering at least the width-tapered region. The first silicon waveguide core has a thickness-wise step in the width-fixed region.

Description

technical field [0001] Embodiments discussed herein relate to a spot size converter and optical device. Background technique [0002] In recent years, due to the promotion of high-definition video distribution and the like, the amount of information has been and is rapidly increasing, and this requires improvement in information processing performance of data centers and the like. In addition, this requires low-cost and low-power devices to achieve an increase in information processing performance, and, in recent years, silicon photonics has been actively researched. [0003] Because the cross-sectional shape of a silicon waveguide core for silicon photonics like the one just described is so small, eg, about 500 nm in width and about 220 nm in height, a mismatch with the spot size of the fiber (eg, about a few μm to 10 μm) occurs. Therefore, an excessively high coupling loss occurs. [0004] Therefore, in order to suppress excessively high coupling loss, a spot size conver...

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Therefore, an excessively high coupling loss occurs

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