Side-Electrode VCSEL Assembly for Active Waveguide Alignment
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Solution Overview
Problem
Conventional vertical cavity surface emitting lasers (VCSELs) lack active alignment capabilities due to laser diode electrodes being connected to the top surface of the slider, necessitating complicated back-side patterning processes and hindering optimal coupling with waveguides.
Innovation Solution
The VCSELs are designed with laser diode electrodes positioned on side surfaces instead of the top surface, allowing for active alignment and simplifying manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If laser diode electrodes are connected to the top surface of the slider, then the VCSEL structure is simplified, but active alignment capability is lost and complicated back-side patterning processes are required
Solution Approach 1:
The patent moves the laser diode electrodes from the top surface (vertical dimension) to the side surfaces (horizontal dimension) of the VCSEL chip. This dimensional relocation eliminates the need for back-side patterning processes while preserving top-surface connection simplicity, as electrodes on side surfaces can be accessed and connected without requiring complex back-side fabrication steps.
Solution Approach 2:
Instead of connecting electrodes to the top surface as in conventional designs, the patent inverts the connection approach by placing electrodes on the side surfaces of the VCSEL chip. This inversion allows for simplified manufacturing processes while enabling active alignment capabilities that were previously compromised by top-surface electrode connections.
2Ease of manufacture
If laser diode electrodes are connected to the top surface of the slider, then manufacturing is simplified, but active alignment capability is hindered
Solution Approach 1:
By relocating electrodes from the top surface to side surfaces, the patent creates spatial separation between the electrode connection plane and the optical emission plane. This dimensional separation allows independent optimization: side-surface electrodes enable top-surface active alignment for maximum waveguide-laser coupling efficiency while maintaining simplified electrode connection processes.
Solution Approach 2:
The patent segments the VCSEL chip into distinct functional surfaces: side surfaces for electrode connections and top surface for optical emission and alignment. This segmentation allows each surface to be optimized independently for its specific function, enabling both simplified manufacturing and high alignment precision without compromise.
3Ease of manufacture
If conventional VCSEL design is used, then cost is reduced, but active alignment capability is lost
Solution Approach 1:
The patent achieves active alignment capability without significantly increasing manufacturing cost by relocating electrodes to side surfaces. This dimensional change enables precision alignment adjustments during assembly while maintaining compatibility with conventional VCSEL fabrication processes, thus preserving cost-effectiveness while gaining adaptability.
Solution Approach 2:
By placing electrodes on side surfaces, the patent enables dynamic adjustment capabilities during assembly and testing. The side-surface electrode configuration allows for active alignment adjustments to optimize waveguide-laser coupling, providing adaptability and versatility while maintaining cost-effectiveness through conventional manufacturing approaches.
Data Source
AI summary
Embodiments of the present disclosure generally relate to a vertical cavity surface emitting laser, a head gimbal assembly for mounting a vertical cavity surface emitting laser, and devices incorporating such articles. In an embodiment, a vertical cavity surface emitting laser (VCSEL) device is provided. The VCSEL device includes a chip for mounting on a slider and two laser diode electrodes. The chip has six surfaces, wherein a first surface of the chip is for facing the slider, a second surface of the chip is opposite the first surface, and the two laser diode electrodes are positioned in any combination on one or more of a third surface, a fourth surface, a fifth surface, or a sixth surface of the chip.