| 摘要 |
The invention relates to a waveguide, which is part of an integrated optical circuit. The waveguide is arranged onto a planar substrate, and it has a core section propagating light to a certain direction, the direction of propagation. According to the invention, the waveguide is a conversion waveguide (60) between a ridge-type waveguide (61) and a strip waveguide (62). 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 (6; 61a, 62a; 61b, 62b) from both edges (60a, 60b). The conversion waveguide has two layers (60 1, 60 2) of different widths (1 60a, 1 60b) so that the height (h60a) of the first layer (60 1) is equal to the height of the ridge (61 1) of the ridge-type waveguide (61), and the height (h60b) of the second layer (60 2) is equal to the height of the base part (61 2) of the ridge-type waveguide (61), and in which the sum of the heights (h60a, h60b) of the layers (60 1, 60 2) is equal to the height of the strip waveguide (62), and the widths of the two layers (60 1, 60 2) are arranged to change uniformly between the waveguides to be connected for fitting them together in the lateral direction. The invention also relates to a method for manufacturing a waveguide onto a substrate.
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