Branch optical wave-guide
First Claim
1. A branch optical wave-guide comprising:
- a first linear wave-guide;
a tapered wave-guide for receiving light from a first linear wave-guide and splitting the received light, which is coupled to the first linear wave-guide; and
a plurality of branched circuits each having a first curved wave-guide, a second curved wave-guide, and a second linear wave-guide coupled in this order, which are coupled to the tapered wave-guide, wherein, when the central axis line of the first linear wave-guide is set to be a reference line, an open portion of a circular arc that is formed by the central axis line of the first curved wave-guide is coupled to face outward when viewed from the reference line, while an open portion of a circular arc that is formed by the central axis line of the second curved wave-guide is coupled to face inward when viewed from the reference line, and wherein the central axis line of the second linear wave-guide and the reference line form an angle, which is set to be greater than 0 degree, and the second curved wave-guide and the second linear wave-guide are coupled such that the central axis line of the second linear wave-guide gets away from the reference line as the second linear wave-guide gets away from the coupling point with the second curved wave-guide.
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Accused Products
Abstract
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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Citations
8 Claims
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1. A branch optical wave-guide comprising:
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a first linear wave-guide;
a tapered wave-guide for receiving light from a first linear wave-guide and splitting the received light, which is coupled to the first linear wave-guide; and
a plurality of branched circuits each having a first curved wave-guide, a second curved wave-guide, and a second linear wave-guide coupled in this order, which are coupled to the tapered wave-guide, wherein, when the central axis line of the first linear wave-guide is set to be a reference line, an open portion of a circular arc that is formed by the central axis line of the first curved wave-guide is coupled to face outward when viewed from the reference line, while an open portion of a circular arc that is formed by the central axis line of the second curved wave-guide is coupled to face inward when viewed from the reference line, and wherein the central axis line of the second linear wave-guide and the reference line form an angle, which is set to be greater than 0 degree, and the second curved wave-guide and the second linear wave-guide are coupled such that the central axis line of the second linear wave-guide gets away from the reference line as the second linear wave-guide gets away from the coupling point with the second curved wave-guide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification