Semiconductor Optical Waveguide Layout for Mounting and Alignment
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Solution Overview
Problem
Conventional semiconductor optical devices with integrated waveguides of different structures face issues such as reduced adhesiveness and mismatched heights, leading to potential mounting failures and optical alignment problems.
Innovation Solution
The semiconductor optical device incorporates a substrate with layered semiconductor layers featuring distinct waveguide structures separated by slits, where protruding portions are formed at the slit bottoms to enhance mounting feasibility and prevent excessive protrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple waveguide structures with different heights are integrated on a single substrate, then device functionality and versatility are improved, but protrusions form on the surface causing reduced adhesiveness and mounting reliability
Solution Approach 1:
The patent introduces a vertical dimension solution by forming a planarization layer above waveguides of different heights. This flattens the top surface to a uniform height, allowing reliable mounting while preserving the vertical structure differences needed for diverse waveguide functionalities below.
Solution Approach 2:
The patent segments the device into distinct functional layers: the waveguide layer with varying heights for different functionalities, and a separate planarization layer that provides a uniform mounting surface. This segmentation allows each layer to independently fulfill its specific function without compromising the other.
2Adaptability or versatility
If multiple waveguide structures with different structures are integrated on a single substrate, then device versatility is improved, but protrusions cause mismatched heights leading to optical alignment problems
Solution Approach 1:
The planarization layer compensates for height variations in the vertical dimension, creating a flat top surface. This allows optical components to be aligned precisely in the horizontal plane without being affected by the underlying vertical height differences of different waveguide structures.
3Shape
If protrusions are formed on the surface opposite to the underside, then waveguide structure differentiation is achieved, but excessive protrusion height prevents mounting from being performed
Solution Approach 1:
Instead of modifying the problematic protruding surfaces, the patent adds a planarization layer in the vertical dimension that overlays and flattens the entire surface. This preserves the differentiated waveguide shapes below while creating a uniform mounting surface above.
Solution Approach 2:
The planarization layer acts as an intermediary between the differentiated waveguide structures and the mounting process. It mediates the conflict by providing a flat interface for mounting while allowing the underlying waveguide structures to maintain their necessary height variations.
Data Source
AI summary
A semiconductor optical device includes: a substrate expanding while intersecting with a first direction; and a layering portion layered on the substrate in the first direction, the layering portion including a plurality of semiconductor layers including a core layer. The layering portion includes a first waveguide structure and a second waveguide structure that are separated from each other in a second direction intersecting with the first direction and that are different from each other, in between the first waveguide structure and the second waveguide structure, a slit is formed that extends from surface of the layering portion to the substrate, and in bottom portion of the slit, a protruding portion is formed that extends along the slit and protrudes in the first direction.