FABRICATION TOLERANT POLARIZATION CONVERTER
First Claim
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1. A waveguide, comprising:
- a first semiconductor layer having a width and a length, first and second sides of the first semiconductor layer defining the width of the semiconductor layer;
a second semiconductor layer disposed adjacent to the first semiconductor layer, the second semiconductor layer having first and second sides each extending from the first side of the first semiconductor layer to the second side of the semiconductor layer, a first distance extending perpendicularly from the first side of the first semiconductor layer to the first side of the second semiconductor layer increasing along a first portion of the length of the first semiconductor layer, a second distance extending perpendicularly from the first side of the first semiconductor layer to the second side of the second semiconductor layer increasing along a second portion of the length of the first semiconductor layer.
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Abstract
The present invention provides a polarization converter, and a method for fabricating the same. The polarization converter includes a geometric shape which induces rotation of a polarization of an optical signal from a first polarization state to a second polarization state as the optical signal propagates along the polarization converter. The performance of the polarization converter is maintained in light of inconsistencies in fabrication processes resulting in improved manufacturability.
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Citations
23 Claims
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1. A waveguide, comprising:
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a first semiconductor layer having a width and a length, first and second sides of the first semiconductor layer defining the width of the semiconductor layer; a second semiconductor layer disposed adjacent to the first semiconductor layer, the second semiconductor layer having first and second sides each extending from the first side of the first semiconductor layer to the second side of the semiconductor layer, a first distance extending perpendicularly from the first side of the first semiconductor layer to the first side of the second semiconductor layer increasing along a first portion of the length of the first semiconductor layer, a second distance extending perpendicularly from the first side of the first semiconductor layer to the second side of the second semiconductor layer increasing along a second portion of the length of the first semiconductor layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 19)
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13. A waveguide having a width and a length, and first and second sides, the first and second sides defining the width of the waveguide, the waveguide comprising:
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a substrate; a semiconductor layer disposed on the substrate, a first portion of the semiconductor layer spaced from a second portion of the semiconductor layer along a portion of the length of the waveguide, each of the first and second portions of the semiconductor layer including a side which extends from the first side of the waveguide to the second side of the waveguide, a first distance extending perpendicularly from the first side of the waveguide to the side of the first portion of the semiconductor layer increasing along a first portion of the length waveguide, a second distance extending perpendicularly from the first side of the waveguide to the side of the second portion of the semiconductor layer increasing along a second portion of the length of the waveguide. - View Dependent Claims (14, 15, 16, 17, 18)
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20. A method of making a waveguide, comprising:
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depositing a first semiconductor layer having a width and a length, first and second sides of the first semiconductor layer defining the width of the semiconductor layer; depositing a second semiconductor layer adjacent the first semiconductor; masking off the second semiconductor layer to define an exposed area on the second semiconductor layer; etching the exposed area to further define the second semiconductor layer, the second semiconductor layer having first and second sides each extending from the first side of the first semiconductor layer to the second side of the semiconductor layer, a first distance extending perpendicularly from the first side of the first semiconductor layer to the first side of the second semiconductor layer increasing along a first portion of the length of the first semiconductor layer, a second distance extending perpendicularly from the first side of the first semiconductor layer to the second side of the second semiconductor layer increasing along a second portion of the length of the first semiconductor layer. - View Dependent Claims (21, 22, 23)
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Specification