Wafer-Level Optoelectronic Module Alignment via 3D Bonding
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Solution Overview
Problem
Current methods for manufacturing optoelectronic modules face challenges in achieving sub-micrometer to few micrometer optical alignment accuracy, leading to costly and time-consuming processes, with high risks of errors and increased costs due to the small dimensions of optical waveguides and components like PDs and VCSELs, especially at higher data rates.
Innovation Solution
A method involving wafer-scale alignment and bonding of wafers with passive optical, optoelectronic, and electronic components, where metalized via holes facilitate electrical connections and precise optical alignment, allowing for the production of optoelectronic modules with alignment tolerances in the range of 1-2 μm, reducing assembly time and cost, and enabling compatibility with semiconductor manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pick and place tooling is used to achieve sub-micrometer alignment accuracy, then alignment precision is improved, but manufacturing time increases significantly
Solution Approach 1:
The patent merges multiple discrete placement operations into a single wafer-level bonding process. Multiple optical components and waveguides are aligned and bonded simultaneously on the wafer scale, eliminating the need for sequential pick-and-place operations. This combines many individual alignment steps into one unified process, achieving high precision while dramatically reducing manufacturing time.
Solution Approach 2:
The patent transitions from two-dimensional planar placement to three-dimensional wafer-level integration. By stacking and bonding wafers with precise vertical alignment, the system achieves sub-micrometer accuracy in the vertical dimension while maintaining high throughput. This dimensional transition enables parallel processing of multiple components simultaneously.
2Ease of manufacture
If individual component placement is performed with 10 μm tolerance, then ease of manufacture is improved, but cumulative alignment error increases
Solution Approach 1:
The patent performs preliminary alignment and bonding of multiple components on the wafer level before final assembly. By pre-aligning waveguides, optical components, and electrical traces on the wafer substrate, the system establishes a unified reference frame that prevents cumulative errors. This preliminary wafer-level integration ensures that all subsequent assemblies inherit the same precise alignment without compounding tolerances.
3Manufacturing precision
If wafer-scale bonding is used to reduce alignment tolerances, then manufacturing precision is improved, but process complexity increases
Solution Approach 1:
The patent employs a universal wafer bonding process that simultaneously achieves multiple functions: optical alignment, electrical connection, and mechanical integration. The same wafer-level bonding technique is used for both optical component alignment and electrical trace connection, eliminating the need for separate alignment and bonding processes. This multi-functionality reduces overall process complexity despite the high precision requirements.
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
This approach significantly reduces alignment errors and assembly time, lowers production costs, and allows for high-speed data transmission beyond 10 Gbps, while also enabling wafer-scale testing and integration with traditional semiconductor processes, resulting in robust and efficient optoelectronic modules.
Implementation Method 1
The second wafer is bonded onto the third wafer such that the respective at least one electronic component of the third module portions is electrically coupled to the respective at least one optoelectronic component of the second module portions by means of the respective metalized via holes
Implementation Method 2
the first wafer is bonded onto the second wafer to provide a wafer stack such that each of the first module portions is aligned to a respective one of the second module portions so that light coupled into the respective at least one passive optical component of the first module portions is coupled out and is directed to the respective at least one optoelectronic component
Implementation Method 3
metalized via holes extending in a material of the second wafer from a first surface of the second wafer to a second opposite surface of the second wafer, and wherein the respective at least one optoelectronic component of the second module portions is electrically connected to the respective metalized via holes
Data Source
AI summary
A method to manufacture optoelectronic modules comprises a step of providing a first wafer comprising a plurality of first module portions, wherein each of the first module portions comprises at least one passive optical component, providing a second wafer comprising a plurality of second module portions, wherein each of the second module portions comprises at least one optoelectronic component. The wafers are disposed on each other to provide a wafer stack that is diced into individual optoelectronic modules respectively comprising one of the first and the second and the third module portions.