VCSEL Output Window Structure With Ion-Implanted Conductive Channels
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Solution Overview
Problem
Conventional VCSEL structures face issues with light shape stability, photoelectric curve linearity, and resistance values due to light-shielding phenomena and spectral width suppression, leading to degraded high-frequency signal transmission and inconsistent eye diagram performances.
Innovation Solution
A VCSEL structure incorporating an ion-implanted region with a gas-furnace configuration around the output window, featuring conductive channels between inner and outer rims, which enlarges the output window aperture without losing resistance, removes shading effects, and maintains spectrum width suppression, improving photoelectric characteristics and high-speed transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional VCSEL structure is used, then the basic laser emission function is achieved, but the light shape stability is poor and the eye diagram performance is degraded
Solution Approach 1:
The patent segments the VCSEL structure into distinct functional regions: a central output window region for light emission, and surrounding ion-implanted regions with gas-furnace configuration for mode control and current confinement. This segmentation allows independent optimization of light emission stability and structural complexity, resolving the contradiction by organizing complexity into functional modules that collectively improve reliability.
Solution Approach 2:
The patent applies local quality by creating regions with different properties: the central output window has high optical transmission quality, while the surrounding ion-implanted regions have modified electrical and optical properties for mode control. This local differentiation allows the structure to achieve light shape stability without requiring uniform complexity throughout the entire device.
2Area of moving object
If the output window aperture is enlarged to improve light emission, then the coupling with optical fiber is enhanced, but the resistance value increases and high-frequency transmission degrades
Solution Approach 1:
The patent introduces an intermediary structure: the ion-implanted region with gas-furnace configuration acts as a mediator between the enlarged output window and the electrical contacts. This intermediary confines the current path and maintains resistance characteristics while allowing the output window aperture to be enlarged for improved optical coupling, thus resolving the contradiction between area expansion and performance maintenance.
Solution Approach 2:
The patent addresses the aperture-resistance contradiction by transitioning to a different dimensional approach: instead of simply enlarging the aperture in two dimensions, the solution adds a vertical dimension with the ion-implanted region extending into the substrate. This vertical current confinement path allows horizontal aperture enlargement while maintaining electrical performance through the third dimension.
3Manufacturing precision
If ion implantation is applied to control optical modes, then the light shape stability improves, but the manufacturing process complexity increases
Solution Approach 1:
The patent applies preliminary action by performing ion implantation during the epitaxial growth process rather than as a separate post-processing step. This preliminary integration of mode-control functionality into the manufacturing process itself achieves precise optical mode control while minimizing the addition of separate manufacturing steps, thus resolving the contradiction between precision and process complexity.
Solution Approach 2:
The patent merges multiple functions into the ion-implanted region: optical mode control, current confinement, and electrical isolation are all achieved through the same ion implantation process and structural feature. This merging reduces the total number of separate manufacturing steps and structural components needed, resolving the contradiction by combining multiple precision requirements into a single integrated solution.
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 enhances light shape stability, photoelectric curve linearity, and high-speed transmission characteristics by eliminating shading effects and preserving spectrum width suppression, resulting in improved eye diagram performance and consistency across different batches.
Implementation Method 1
an ion-implanted region, at least located in the mesa; wherein: the ion-implanted region is an insulating area formed by implanting a plurality of non-conductive elements in the second mirror layer
Implementation Method 2
a second mirror layer, located on active region and having an upper surface; an oxide layer, located in the second mirror layer and having a central opening
Implementation Method 3
at least one conductive channel extends outward from the arc-shaped inner rim toward the arc-shaped outer rim
Data Source
AI summary
A structure of Vertical Cavity Surface-Emitting Laser (VCSEL) comprises an ion-implanted region with gas-furnace configuration arranged in the second mirror layer around a laser light output window, in order to retain several conductive passages between the inner and outer rims of the ion-implanted region, so as to let the aperture of the inner rim of the metal layer (that is, the aperture of the output window) be expanded without loss of resistance. Not only the shading effect can be removed, the spectrum width suppression function can be preserved, but also various photoelectric characteristics such as transmission eye diagram and photoelectric curve linearity can be improved, in addition, high-speed transmission characteristics can also be optimized.