Optical waveguide element and method for manufacturing optical waveguide element
First Claim
1. A optical waveguide element, having n substantively planar light-wave circuit layers, each constituted of a core portion for receiving and guiding a light signal and a clad layer covering said core portion, that are sequentially laminated to achieve a multilayer structure (n represents an integer equal to or larger than 2);
- and wherein at least a linear portions of a specific length of the core portions in at least two contiguous light wave circuit layers are aligned parallel to one another in a common plane extending substantially perpendicular to the planes of the light-wave circuit layers to produce optical coupling between the respective linear potions of the aligned core portions.
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Abstract
According to the present invention, which provides a optical waveguide element achieving high performance and high yield, that makes it possible to form a complex light-wave circuit structure without requiring a larger mounting area and a optical waveguide element manufacturing method, a optical waveguide element 100 is provided with an Si substrate 102 and a first light-wave circuit layer 112 and a second light-wave circuit layer 120 sequentially laminated on the substrate 102. At the first light-wave circuit layer 112, a first optical waveguide structure constituted of a first clad layer 104 formed toward the substrate 102, a first core portion 108 and a second clad layer 110 formed toward the second light-wave circuit layer 120 is achieved. In addition, at the second light-wave circuit layer 120, a second optical waveguide structure constituted of a second core portion 116 and a third clad layer 118 at the second light-wave circuit layer 120 is achieved. Since the first light-wave circuit layer 112 and the second light-wave circuit layer 120 are directly laminated, a directional optical coupling is induced between the first core portion 108 and the second core portion 116.
55 Citations
12 Claims
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1. A optical waveguide element, having n substantively planar light-wave circuit layers, each constituted of a core portion for receiving and guiding a light signal and a clad layer covering said core portion, that are sequentially laminated to achieve a multilayer structure (n represents an integer equal to or larger than 2);
- and wherein at least a linear portions of a specific length of the core portions in at least two contiguous light wave circuit layers are aligned parallel to one another in a common plane extending substantially perpendicular to the planes of the light-wave circuit layers to produce optical coupling between the respective linear potions of the aligned core portions.
- View Dependent Claims (2, 3, 4, 7, 8, 9, 10, 11, 12)
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5. A optical waveguide element manufacturing method comprising:
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a first step in which a first clad layer is formed;
a second step in which a kth core portion is formed on a kth clad layer (k is an integer equal to or larger than 1 and equal to or smaller than n, which is an integer equal to or larger than
2);
a third step in which a (k+1)th clad layer is formed to cover said kth core portion; and
a fourth step in which said second step and said third step are repeated alternately n times; and
, wherein;
said third step comprises a process in which a source material layer to constitute said kth core portion is formed on said kth clad layer, and a process in which said kth core portion is formed by removing any unnecessary portions of said source layer through reactive ion etching.
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6. A optical waveguide element manufacturing method, comprising:
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a first step in which a first clad layer is formed;
a second step in which a kth core portion is formed on a kth clad layer (k is an integer equal to or larger than 1 and equal to or smaller than n which is an integer equal to or larger than
2);
a third step in which a (k+1)th clad layer is formed to cover said kth core portion; and
a fourth step in which said second step and said third step are repeated alternately n times; and
, wherein;
said third step comprises process in which a source material layer to constitute said kth core portion is formed on said kth clad layer, and a process in which said kth core portion is formed by removing any unnecessary portions of said source layer through reactive ion etching; and
said kth clad layer is formed through chemical vapor deposition.
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Specification