MEMS Optical Beam Waveguide Alignment for Stacked Die Interconnects
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Solution Overview
Problem
Existing optical interconnects between integrated circuit chips face challenges due to alignment issues, cost, complexity, and bandwidth limitations, particularly in stacked die modules, where conductor-based connections restrict density and bandwidth, and external deflection structures add complexity and cost.
Innovation Solution
The implementation of MEMS optical beam waveguides with multiple deflection electrodes for two-dimensional alignment and controlled feedback, allowing for precise optical communication between die stacks without external deflection structures, thereby enhancing alignment and reducing system complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external mirrors or deflectors are used to transfer optical information between IC chips, then alignment flexibility is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the optical waveguide and deflection functionality into a single integrated structure. The MEMS beam waveguide integrates the waveguide core with deflection electrodes directly, eliminating the need for separate external mirrors or deflectors. This merging reduces device complexity while maintaining alignment flexibility through the integrated deflection capability.
Solution Approach 2:
The patent introduces an intermediary MEMS structure that serves as both the waveguide and the deflection mechanism. The MEMS beam waveguide acts as an intermediary between the optical source and the target, providing integrated deflection control without requiring external components. This intermediary structure resolves the contradiction by providing both guidance and deflection in one element.
2Measurement precision
If tight alignment tolerances are used to meet information transmission requirements, then transmission precision is improved, but manufacturing cost and assembly complexity increase
Solution Approach 1:
The patent employs dynamic deflection control through MEMS electrodes that can adjust the optical beam path in real-time. This dynamic capability allows the system to compensate for alignment variations after assembly, thereby achieving high transmission precision without requiring extremely tight manufacturing tolerances. The dynamic adjustment reduces assembly complexity while maintaining precision.
Solution Approach 2:
The patent implements feedback control mechanisms that monitor and adjust the optical beam alignment. By using feedback from the actual transmission conditions, the system can correct alignment deviations, reducing the need for precision manufacturing and simplifying the assembly process while maintaining high transmission precision.
3Reliability
If conductor-based connections are used for data signal communication, then electrical connectivity is ensured, but bandwidth and power efficiency are limited
Solution Approach 1:
The patent replaces electrical conductor-based connections with optical waveguide connections. By substituting electrical signals with optical signals transmitted through MEMS beam waveguides, the system achieves higher bandwidth and improved power efficiency while maintaining reliable communication. This substitution eliminates the bandwidth and power limitations inherent in electrical connections.
4Quantity of substance
If stacked die modules are used to provide high density information systems, then system density is improved, but power consumption and heat dissipation increase
Solution Approach 1:
The patent replaces electrical interconnects with optical interconnects in stacked die modules. The optical MEMS beam waveguides transmit data signals with lower power consumption and reduced heat generation compared to electrical conductors. This substitution enables high-density stacked configurations without the power and thermal limitations of electrical connections.
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 solution enables high-density, low-power, high-performance optical communication systems by providing precise alignment and increased bandwidth within stacked die assemblies, improving yield and reducing the need for external deflection mechanisms.
Implementation Method 1
transferred along an optical fiber or waveguide path
Implementation Method 2
transferred along an optical fiber or waveguide path
Implementation Method 3
multiple deflection electrodes for two-dimensional alignment
Data Source
AI summary
A high density, low power, high performance information system, method and apparatus are described in which perpendicularly oriented processor and memory die stacks (130, 140, 150, 160, 170) include integrated deflectable MEMS optical beam waveguides (e.g., 190) at each die edge (e.g., 151) to provide optical communications (184) in and between die stacks by using a beam control method and circuit to maintain and adjust alignment over time by calibrating and updating X and Y counter values stored in deflection registers (541-542) to control DAC circuitry (546, 548) which generates and supplies deflection voltages to charging capacitors (551, 552) connected to deflection electrodes (195-197) positioned on and around each MEMS optical beam waveguide (193-194) to provide two-dimensional alignment and controlled feedback to adjust beam alignment and establish optical communication links between die stacks.