| 摘要 |
When the longitudinal central axis line of a first linear wave-guide 2 that receives light is set to be a reference line, open portions of circular arcs of first curved wave-guides 4a, 4b that are coupled to a tapered wave-guide 3 face outward when viewed from the reference line. On the other hand, open portions of circular arcs of second curved wave-guides 5a, 5b that are coupled to the first curved wave-guides 4a, 4b face inward when viewed from the reference line. Furthermore, second linear wave-guides 6a, 6b, which are coupled to the first linear wave-guide through the first and second curved wave-guides, and the reference line X are outwardly coupled to form an angle, which is set to be greater than 0 degree. According to the present invention, there can be provided a branch optical wave-guide that can make its entire length short with polarization property of respective output ports equalized.
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