Manufacture of a silicon waveguide structure
First Claim
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1. A process for making a silicon rib waveguide structure comprising:
- forming a window in a protective layer on the surface of a silicon wafer to expose a part of said surface;
depositing a buffer layer at least over said exposed surface;
carrying out an etch step to etch the buffer layer and silicon outside a protected rib portion thereby to form a silicon rib with the buffer layer on its upper surface; and
forming a layer of cladding at least on side walls of the silicon rib.
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Abstract
A process for making a silicon rib wavegide structure is described comporising the following steps:
(i) forming a window in a protective layer on the surface of a silicon wafer to expose a part of said surface;
(ii) depositing a buffer layer at least over said exposed surface;
(iii) carrying out an etch step to etch the buffer layer and silicon outside a protected rib portion thereby to form a silicon rib with the buffer layer on its upper surface; and
(iv) forming a layer of cladding at least on side walls of the silicon rib.
31 Citations
9 Claims
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1. A process for making a silicon rib waveguide structure comprising:
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forming a window in a protective layer on the surface of a silicon wafer to expose a part of said surface; depositing a buffer layer at least over said exposed surface; carrying out an etch step to etch the buffer layer and silicon outside a protected rib portion thereby to form a silicon rib with the buffer layer on its upper surface; and forming a layer of cladding at least on side walls of the silicon rib. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification