Optical coupling structure
First Claim
1. An optical coupling structure, comprising:
- a silicon-on-insulator substrate comprising a top side and a bottom side, wherein a buried oxide layer is interposed between the top side and the bottom side;
a wave guide formed on the top side;
a prism formed on the bottom side, wherein a portion of the buried oxide layer serves as a spacer between the prism and the waveguide; and
a cladding region that is located in the substrate adjacent to the prism and aligned below the waveguide and the buried oxide layer.
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Abstract
An optoelectronic coupling structure, a method of manufacture, and a method of operation are described. The optical coupling structure includes a waveguide that is formed within a device layer of an SOI substrate. A prism is located on a bottom side of the SOI substrate. A BOX layer of the SOI substrate, which is interposed between the prism and the waveguide, serves as a spacer region, which promotes an optical coupling of the prism to the waveguide. By positioning the prism below the waveguide, an optoelectronic IC may more readily accommodate a prism. The prism may be directly fabricated in a bulk layer of the SOI substrate or directly bonded to a bottom side surface of the BOX layer.
213 Citations
20 Claims
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1. An optical coupling structure, comprising:
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a silicon-on-insulator substrate comprising a top side and a bottom side, wherein a buried oxide layer is interposed between the top side and the bottom side; a wave guide formed on the top side; a prism formed on the bottom side, wherein a portion of the buried oxide layer serves as a spacer between the prism and the waveguide; and a cladding region that is located in the substrate adjacent to the prism and aligned below the waveguide and the buried oxide layer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for making an optical coupling structure, the method comprising:
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providing a silicon-on-insulator substrate that includes a top side and a bottom side, wherein a buried oxide layer is interposed between the top side and the bottom side; forming a waveguide on the top side; and forming a prism on the bottom side, wherein a portion of the buried oxide layer establishes a spacing between the prism and the waveguide; and forming a cladding region in the substrate adjacent to the prism and aligned below the waveguide and the buried oxide layer. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An optical coupling structure, comprising:
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a silicon-on-insulator substrate including a top side and a bottom side, wherein a buried oxide layer is interposed between the top side and the bottom side of the silicon-on-insulator substrate; a first device located on the bottom side of the silicon-on-insulator substrate, wherein a portion of the buried oxide layer promotes an optical coupling of the first device to at least one device located on the top side of the silicon-on-insulator substrate; and a cladding region that is located in the substrate adjacent to the device and aligned below the at least one device on the top side of the silicon-on-insulator substrate and the buried oxide layer. - View Dependent Claims (19, 20)
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Specification