Ridge Semiconductor Optical Structure With Ductile Shock Protection
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Solution Overview
Problem
Ridge-type semiconductor optical devices with mesa stripe structures face damage due to the insufficient protective capabilities of projection structures made of the same material and height as the mesa stripe structures, which can lead to degradation and parasitic capacitance issues affecting high-speed operation.
Innovation Solution
Incorporating a ductile protection film on projection structures that are separated from the electrode pattern, with a height higher than the ridge electrode, to absorb external shocks and prevent damage to the mesa stripe structure, while maintaining a design that minimizes parasitic capacitance and stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If projection structures are made of the same material and at the same height as the mesa stripe structure, then the device structure is simple, but the protective capability is insufficient
Solution Approach 1:
The patent applies composite materials by combining the original semiconductor material of the projection structures with a ductile protection film material. This creates a composite structure where the projection structures retain their original material properties while the added ductile material provides enhanced protective capabilities, directly resolving the contradiction between protective capability and structural simplicity.
Solution Approach 2:
The patent applies local quality by selectively adding protection films only to the projection structures that require enhanced protection, rather than uniformly modifying the entire device. The protection film is applied locally to specific regions where damage prevention is most critical, optimizing protective capability while minimizing additional complexity.
2Strength
If the protection film is made of ductile material and positioned higher than the ridge electrode, then damage protection is improved, but parasitic capacitance increases
Solution Approach 1:
The patent applies local quality by strategically positioning the protection film only where damage protection is most needed - on the projection structures adjacent to the mesa stripe structure - rather than covering the entire electrode pattern. This localized approach provides maximum protective benefit while minimizing the addition of parasitic capacitance.
Solution Approach 2:
The protection film acts as an intermediary element between the projection structures and external damaging forces. It absorbs and dissipates mechanical shocks and stresses before they can reach the fragile mesa stripe structure, while its electrical properties are managed to minimize parasitic capacitance effects on high-speed operation.
3Stability of the object's composition
If the electrode pattern is separated from the protection film, then stress on the mesa stripe structure is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the device structure into distinct functional regions: the electrode pattern, the protection film, and the mesa stripe structure. By separating the electrode pattern from the protection film, each component can be optimized independently for its specific function, reducing stress transmission to the mesa stripe structure while maintaining manufacturability through modular fabrication processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively protects the mesa stripe structure from damage, enhances the device's operational characteristics, and supports high-speed operations beyond 56 Gbps by reducing stress and parasitic capacitance.
Implementation Method 1
the protection film being made of a ductile material
Data Source
AI summary
A ridge-type semiconductor optical device includes: a substrate; a mesa stripe structure on the substrate, the mesa stripe structure extending in a first direction, the mesa stripe structure comprising a brittle material; an electrode pattern including a ridge electrode on the mesa stripe structure; a pair of projection structures on the substrate and on both sides of the mesa stripe structure in a second direction perpendicular to the first direction; and a protection film on each projection structure, the protection film being separated from the electrode pattern, the protection film comprising a ductile material, the protection film and a corresponding one of the pair of projection structures being aligned at edges toward at least one orientation along the first direction, the protection film having a top higher from the substrate than a top of the ridge electrode.