| 摘要 |
An optical waveguide having an effect resulting from a size reduction such as an increase in the number of fetches, because it has no substantial rise in the manufacturing cost but can reduce the size, and an optical system including the optical waveguide. The optical system includes first, second and third optical input/output means (12, 14 and 16), fourth and fifth multimode optical waveguides (20 and 22) capable of transmitting a light in multiple modes, and optical filter mounting means (26) for mounting an optical filter (24) between the fourth and fifth multimode optical waveguides (20 and 22) in a direction to intersect the traveling direction of the light in the fourth and fifth multimode optical waveguides. The optical system is characterized in that the fourth and fifth multimode optical waveguides (20 and 22) have different widths in a direction perpendicular to the light traveling direction. ® KIPO & WIPO 2007
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