MEMS Micro-Mirror Alignment for Optical PCB Power Coupling
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Solution Overview
Problem
Existing optical printed circuit boards (PCBs) face challenges in achieving precision alignment of waveguides with transmitters and receivers to minimize optical power loss, requiring systems and methods for autonomous, dynamic, and active alignment.
Innovation Solution
The use of Micro-Electro-Mechanical System (MEMS) micro-mirrors dynamically adjusted by a controller to optimize alignment, employing a full-matrix optical scan algorithm that breaks down scans into coarse and fine resolutions to identify maximum power spots, allowing for precise positioning of the mirrors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional static alignment methods are used for optical PCB, then manufacturing is simpler, but alignment precision is insufficient causing high optical power loss
Solution Approach 1:
The patent applies dynamics by replacing static alignment with dynamic active alignment using MEMS micro-mirrors that can be adjusted in real-time. The controller dynamically positions the MEMS mirrors to compensate for misalignment between waveguides and optical components, enabling sub-micron precision alignment that adapts to manufacturing tolerances and environmental variations.
Solution Approach 2:
The patent substitutes traditional mechanical alignment adjustment with an electro-optical system using MEMS micro-mirrors controlled by voltage signals. Instead of mechanically adjusting components during assembly, the system uses electrical control to position micro-mirrors and optimize optical coupling, achieving higher precision and enabling post-manufacturing adjustment.
2Measurement precision
If full-matrix optical scan with high resolution is performed, then alignment accuracy is improved, but alignment time increases
Solution Approach 1:
The patent segments the full-matrix optical scan into multiple passes with different resolution levels. The process starts with a coarse scan at lower resolution to identify the general alignment region, then performs multiple finer scans at progressively higher resolution within that region. This segmentation reduces the total number of scan operations needed while maintaining high final precision.
Solution Approach 2:
The patent applies preliminary action by performing coarse-resolution scans first to establish an initial alignment estimate and define a reduced search region. This preliminary information guides subsequent high-resolution scans, eliminating the need to perform maximum-resolution scans across the entire matrix and significantly reducing total alignment time.
3Loss of energy
If dynamic active alignment with MEMS mirrors is implemented, then optical power loss is reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies universality by designing a multi-functional alignment system where MEMS micro-mirrors serve multiple purposes: they perform both coarse and fine alignment, enable dynamic optimization of optical coupling, and can compensate for environmental variations. This multi-functionality justifies the added complexity by providing versatile alignment control that static systems cannot achieve.
Solution Approach 2:
The patent implements feedback control by continuously monitoring optical power levels and using this information to adjust MEMS mirror positions. The controller receives feedback about alignment quality from optical detectors, processes this information, and dynamically modifies mirror positions to maximize coupling efficiency, reducing optical power loss through closed-loop optimization.
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 improves alignment accuracy to within +/â0.5 microns for single mode and +/â1 microns for multi-mode transmissions, reducing optical power loss and enhancing system stability through real-time monitoring and recalibration.
Implementation Method 1
precision alignment of the waveguide with the transmitter and receiver via dynamically adjusting Micro-Electro-Mechanical System (MEMS) micro-mirrors
Implementation Method 2
identifying a first maximum power spot within a region where the optical signal is detected
Data Source
AI summary
A device may perform a first full-matrix optical scan covering a first scan area and having a first resolution to identify a first maximum power spot within a region where the optical signal is detected when a first MEMS micro-mirror and a second MEMS micro-mirror are concurrently at their respective first maximum power positions. The device may perform a second full-matrix optical scan centered around the first maximum power spot, the second full-matrix optical scan covering a second scan area smaller than the first scan area and having a second resolution finer than the first resolution. The device may identify a second maximum power spot within the first maximum power spot when the first MEMS micro-mirror and the second MEMS micro-mirror are concurrently at their respective second maximum power positions. The device may lock the respective second maximum power positions of the first MEMS micro-mirror and the second MEMS micro-mirror.