Yasuyoshi Uchida, Hiroshi Kawashima, and Kazutaka Nara
Abstract
Recently, new planar lightwave circuit (PLC) components are under study, in response to the requirement of downsizing and cost reduction, to increase their refractive index difference Δ between cladding and core. Accordingly, we are developing 2.milan米兰体育官网入口; silica-based PLCs. However, it is difficult to put the 2.milan米兰体育官网入口; silica-based PLCs directly into practical applications because their coupling loss with a single-mode fiber is as high as 2.9 dB/ facet, raising a need for developing a spot size converter (SSC) to lower the loss. We have designed here, therefore, a new vertical SSC that has a broad core expanded in both horizontal and vertical directions, and fabricated the vertical SSC by combining plasma enhanced chemical vapor deposition (PECVD) and shadow mask. As a result, it has been confirmed that the use of the vertical SSC can significantly reduce the coupling loss between the 2.milan米兰体育官网入口; waveguide and fiber to 0.06 dB/facet.
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