Optical waveguide
2 Assignments
0 Petitions
Accused Products
Abstract
A waveguide, which is part of an integrated optical circuit is arranged onto a planar substrate, and has a core section propagating light to a direction of propagation. The waveguide is a conversion waveguide between a ridge-type waveguide and a strip waveguide. In the conversion waveguide, the core section is made of the one and same material so that the cross-section of the core section transverse to the direction of propagation of light is two-step from both edges. The conversion waveguide has two layers of different widths so that the height of the first layer is equal to the height of the ridge of the ridge-type waveguide, and the height of the second layer is equal to the height of the base part of the ridge-type waveguide.
11 Citations
15 Claims
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1-7. -7. (canceled)
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8. Waveguide, which is part of an integrated optical circuit, the waveguide being arranged onto a planar substrate and having a core section propagating light to a certain direction, the direction of propagation, characterised in that the waveguide is a conversion waveguide (60) between a ridge-type waveguide (61) and a strip waveguide (62), in which conversion waveguide the core section is made of the one and same material so that the cross-section of the core section transverse to the direction of propagation (z) of light is two-step (6;
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61a, 622a;
61b, 62b) from both edges (60a, 60b), and in which conversion waveguide there are two layers (601, 602) of different widths (160a, 160b), the height (h60a) of the first layer (601) being equal to the height of the ridge (611) of the ridge-type waveguide (61), and the height (h60b) of the second layer (602) being equal to the height of the base part (612) of the ridge-type waveguide (61), and in which the sum of the heights (h60a, h60b) of the layers (601, 602) is equal to the height of the strip waveguide (62), the widths of the two layers (601, 602) being arranged to change uniformly between the waveguides to be connected for fitting them together laterally. - View Dependent Claims (9, 10, 11)
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61a, 622a;
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12. Method for manufacturing an integrated optical circuit onto a substrate, characterised in that the waveguide is a conversion waveguide (60), which is manufactured between the ridge-type waveguide (61) and the strip waveguide (62) onto such a substrate (7), on which there is a light-propagating core section (7c), in which method the core layer (7c) is controllably thinned in two stages for forming two different steps on both sides of the conversion waveguide so that different process patterns are utilised in both thinning stages, the edges of which determine the location of the edges of the steps of the waveguide on the substrate, so that the result obtained is a waveguide structure, which is two-step (6;
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61a, 62a;
61b, 62b) from both edges (60a, 60b) transverse to the direction of propagation of light, in which the conversion waveguide (60) is provided with two layers (601, 602) of different widths (160a, 160b) so that the height (h60a) of the first layer (601) is arranged to be equal to the height of the ridge (611) of the ridge-type waveguide (61), and the height (h60b) of the second layer (602) is arranged to be equal to the height of the base part (612) of the ridge-type waveguide (61), and in which the sum of the heights (h60a, h60b) of the layers (601, 602) is arranged to be equal to the height of the strip waveguide (62), and the widths of the two layers (601, 602) are arranged to change uniformly between the waveguides (61, 62) to be connected for fitting them together in the lateral direction. - View Dependent Claims (13, 14, 15)
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61a, 62a;
Specification