| 摘要 |
For optically coupling two optical waveguide devices differing in a spot size of a light wave, an optical coupling device converts the light wave into a light wave of a desired spot size using the interference between the radiation mode and the guided mode which occurs in an optical waveguide. One of the two optical waveguide devices has a first optical waveguide and a second optical waveguide joined to the end of the first optical waveguide, wherein the width or thickness of the second waveguide different from the width or thickness of the first optical waveguide, and the length is set to the length at which a light wave of a desired spot size can be obtained.
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