| 摘要 |
A polymer optical waveguide comprising a lower clad layer, a core layer and an upper clad layer that are provided on a substrate, and a cover member covering at least part of the upper clad layer. The upper clad layer and the cover member are fixed together by a radiation curing adhesive. The cover member consists of quartz or glass. This polymer optical waveguide can prevent moisture from being absorbed through the upper clad layer and restrict characteristics changes due to moisture absorption by materials and the lowering of adhesion with the substrate even under rigorous environmental conditions, and does not suffer a deterioration in optical characteristics after subjected to a reliability test, thereby ensuring a sufficient reliability and stable transmission characteristics.
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