Start of page

Main Content starts

Furukawa Review No.37

Development of Vertical Spot Size Converter (SSC) with Low Coupling Loss Using 2.5%Δ Silica-Based Planar Lightwave Circuit

Yasuyoshi Uchida, Hiroshi Kawashima, and Kazutaka Nara


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 2.5%Δ silica-based PLCs. However, it is difficult to put the 2.5%Δ 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 2.5%Δ waveguide and fiber to 0.06 dB/facet.

Open PDF file.Full Text PDF(1,049KB)

Main Content ends

Sub Category Menu starts

Sub Category Menu ends

Bound to Innovate

End of page