| 摘要 |
A linear waveguide 12 is formed on a substrate 11. A non-linear waveguide 13 whose refractive index may vary depending on an electric field intensity of a light is formed in contact with or at a given distance from the linear waveguide 12. These waveguides form a branch structure. The linear waveguide 12 is the original optical transmission path, while the non-linear waveguide 13 is a bypass for an inicident light with an electric field intensity higher than a set value. Adjusting the refractive indices of the linear waveguide 12 and the non-linear waveguide 13 by, for example, selection of materials, can make the incident light 14 transmitted through the linear waveguide 12 when its intensity is below the set value or through the non-linear waveguide 13 when its intensity is equal to or higher than the set value.
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