Quilt Packaging for Photonic Interconnects
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Solution Overview
Problem
Current photonic integrated circuits face challenges in cost-effectiveness and detector quality due to the need for different materials for waveguides and detectors, and existing methods for low loss optical coupling between these components are inefficient.
Innovation Solution
The implementation of quilt packaging, which involves forming interconnecting structures on integrated circuit chips to align and bond optical components such as lasers, waveguides, and detectors, allowing for the use of different material wafers and minimizing waveguide-waveguide coupling loss through nodules and notches, and potentially filling the inter-chip gap with an index matching material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional semiconductor processing technique is used to integrate QC laser with waveguide and detector on the same wafer, then manufacturing simplicity is maintained, but detector quality is not optimized and cost effectiveness deteriorates
Solution Approach 1:
The patent divides the photonic integrated circuit into separate modules fabricated on different wafers (QC laser on InP wafer, detector on InGaAs wafer, waveguide on SiN wafer). Each module is independently optimized on its dedicated substrate and then interconnected through quilt packaging, allowing detector quality optimization without compromising manufacturing feasibility.
Solution Approach 2:
The patent introduces waveguide components and quilt packaging interconnect structures as intermediaries between the QC laser and detector. These intermediaries enable optical coupling between separately fabricated modules while maintaining electrical continuity, resolving the conflict between detector optimization and manufacturing simplicity.
2Manufacturing precision
If different material wafers are used for waveguide and detector to optimize performance, then detection quality is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs a universal quilt packaging interconnect structure that can accommodate multiple material systems (InP, InGaAs, SiN, LiNbO3). The standardized metal nodule and void geometry provides both optical coupling and electrical connectivity across different material platforms, reducing the complexity of multi-material integration.
Solution Approach 2:
The patent optimizes geometric parameters of the quilt packaging structure (nodule diameter, void depth, spacing) to achieve low-loss optical coupling between different material wafers. By tuning these parameters, the system maintains high detection quality while managing the complexity of interfacing diverse materials.
3Manufacturing precision
If quilt packaging with metal nodules and voids is used to connect integrated circuits, then alignment precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent pre-forms metal nodules on one wafer and corresponding voids on another wafer before final assembly. This preliminary structuring establishes precise alignment features that guide the quilt packaging process, achieving high alignment precision while simplifying the actual bonding operation through pre-positioned interconnect elements.
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 enables flexible integration of quantum cascade lasers with improved detection quality and reduced costs, achieving high-performance chip-to-chip optical connections with reduced coupling loss and maintaining electrical continuity across chips.
Implementation Method 1
filling the inter-chip gap with an index matching material
Data Source
AI summary
First and second integrated devices each have an optical component and a plurality of interconnect structures disposed one edge thereon. The first edge surface of the second integrated device is positioned contiguous to the first edge surface of the first integrated device. The interconnect structures disposed on the first integrated device are in physical contact with the interconnect structures disposed on the edge surface of the second integrated device so as to provide alignment for conveying at least one signal between the optical components on the first and second integrated devices.