Flexible Substrate Waveguide Alignment via Dynamic Bending
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Solution Overview
Problem
The precise alignment of optical components, such as VCSELs and photodiodes, with respect to light-carrying mediums in optical subassemblies is challenging due to the need for high mechanical accuracy, which is difficult to achieve in large-scale manufacturing at affordable costs, especially as data rates increase and systems transition to optical transmission.
Innovation Solution
A method involving a flexible substrate with a waveguide, where the substrate is positioned on a flip-chip bonder, bent to expose the waveguide, and an optical component is vertically aligned and fixed using a bond head, allowing for precise mounting and alignment, followed by the substrate's return to its original position, facilitating the integration of optical components with high accuracy and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If passive alignment with different types of packages or optical subassemblies is used, then alignment accuracy can be achieved, but large scale manufacturing problems and high cost occur
Solution Approach 1:
The patent employs a dynamic bending mechanism that allows the rigid substrate to be flexed during the alignment process. The substrate is bent to a first position to enable optical component placement, then returned to its original planar configuration. This dynamic positioning enables precise alignment without requiring complex passive alignment packages, thereby improving manufacturability while maintaining accuracy.
Solution Approach 2:
The substrate is pre-formed with a bent configuration before optical component assembly. This preliminary bending action positions the waveguide exposed end in a vertical orientation, facilitating subsequent optical component mounting. The substrate is then returned to its original position after assembly, eliminating the need for complex alignment mechanisms while ensuring precise component placement.
2Stability of the object's composition
If rigid structures are used for optical transmission, then structural stability is improved, but system architecture becomes complex and cumbersome
Solution Approach 1:
The substrate is divided into distinct functional regions: a rigid portion maintaining structural stability and a flexible portion enabling dynamic positioning. This segmentation allows the rigid substrate to provide overall structural support while the flexible portion accommodates the optical component assembly process, simplifying the overall system architecture without compromising stability.
Solution Approach 2:
The patent utilizes a flexible substrate portion that can be bent during assembly and then returned to its original configuration. This flexible element replaces complex rigid alignment mechanisms, reducing system architecture complexity while maintaining the necessary structural stability through the rigid substrate portions.
3Manufacturing precision
If mechanical alignment with high accuracy is performed, then optical component positioning precision is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The substrate's ability to be dynamically bent and returned to its original position simplifies the alignment process. Instead of requiring complex rigid alignment mechanisms, the dynamic bending action positions components with high precision while reducing the complexity of the alignment process through a simpler, more flexible mechanism.
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 precise and cost-effective alignment of optical components, improving the manufacturing efficiency and reducing the complexity of optical transceiver assemblies, allowing for higher data rates and more affordable production of optical subassemblies.
Implementation Method 1
bending the flexible portion of the substrate to place the waveguide exposed end in approximately a vertical position
Implementation Method 2
vertically positioning a flip-chip bonder bond head containing an optical component upon the waveguide exposed substrate edge to optically mate the optical component with the exposed waveguide
Implementation Method 3
vertically upwardly moving a clamp through the stage opening to bend the flexible portion of the substrate
Data Source
AI summary
A method for fabricating an optical assembly by placing a flexible portion of a substrate, including a waveguide, upon a horizontally movable stage of a flip-chip bonder. Then moving a clamp through an opening in the stage to bend the flexible portion of the substrate to place the waveguide exposed end in approximately a vertical position and vertically downwardly moving a bond head containing an optical component upon the waveguide exposed substrate edge to position the optical component with the exposed waveguide and mounting the optical component to the substrate edge. Then releasing the optical component from the bond head while moving the clamp downward through the stage opening and unbending the flexible portion of the substrate with the optical component mounted thereon.