| 摘要 |
An optical waveguide device 1 A has a substrate 22 and a supporting body 10 for supporting the substrate. The substrate 22 has a main body 2 made of an electrooptic material and one and the other main faces, optical waveguides 3 a, 3 b and electrodes 4 B, 4 C provided on the side of the one main face 2 a of the main body 2 The supporting body 10 is joined with the substrate 2 on the side of the other main face, and the electrode has a feedthrough portion. The device 1 A further has a low dielectric portion 7 provided under the feed through portion and between the other main face 2 b of the main body 2 and the supporting body 10.
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