Polymer Waveguide Connector Thermal Alignment
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Solution Overview
Problem
Existing polymer waveguide connectors face challenges in precise positioning due to high coefficients of thermal expansion (CTEs) of polymer materials, leading to positioning errors that can result in signal loss from imperfect junctions.
Innovation Solution
A waveguide connector design featuring a ferrule with low CTE and a polymer waveguide with a higher CTE, where the waveguide is heated to align with the ferrule studs, then cooled under tension to achieve precise alignment, eliminating the need for a backfilm and increasing the underclad thickness for stability and consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If polymer waveguide connectors are assembled using conventional methods, then manufacturing is simple, but positioning precision is insufficient (errors exceed 1 micrometer)
Solution Approach 1:
The patent changes the thermal parameter (temperature) to control the expansion and contraction of polymer materials with different CTEs. By heating the assembly to a specific temperature, the polymer waveguide expands to align with the ferrule studs. Upon cooling, the differential contraction creates tensile stress that maintains precise alignment, achieving positioning precision better than 1 micrometer through thermal parameter control.
Solution Approach 2:
The patent exploits thermal expansion by selecting polymer materials with higher CTE than the ferrule material. During heating, the polymer expands more than the ferrule, enabling alignment between waveguide cores and ferrule studs. During cooling, the polymer contracts more, creating tensile stress that locks the alignment in place, achieving sub-micrometer positioning precision through controlled thermal expansion and contraction.
2Stability of the object's composition
If polymer waveguides are used without tensile stress, then fabrication is easier, but positioning stability deteriorates due to high CTE
Solution Approach 1:
The patent applies preliminary anti-action by intentionally introducing tensile stress during the assembly process to counteract the harmful effect of high CTE. The waveguide is assembled under tensile stress created by differential thermal contraction, which pre-compensates for expansion that would occur during subsequent temperature variations, thereby maintaining positioning stability without requiring complex fabrication processes.
Solution Approach 2:
The patent uses thermal expansion differences between polymer waveguide and ferrule materials to create and maintain tensile stress. The higher CTE of the polymer causes it to contract more upon cooling, generating tensile stress that stabilizes the waveguide position and compensates for thermal expansion during operation, achieving positioning stability while maintaining relatively simple fabrication.
3Manufacturing precision
If alignment features are made smaller for precision, then positioning precision improves, but manufacturing precision of features deteriorates
Solution Approach 1:
The patent changes the thermal parameter to enable alignment of larger, more manufacturable features. By controlling temperature during assembly, the waveguide expands to align its alignment features with the ferrule studs, allowing the use of larger features that are easier to manufacture with acceptable precision while still achieving sub-micrometer alignment accuracy through thermal control.
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 achieves positioning errors of less than 1 μm, enhancing the alignment and physical strength of the waveguide cores, reducing misalignment and signal loss.
Implementation Method 1
the polymers use generally have high coefficients of thermal expansion (CTEs), which causes the polymer to shrink or expand as the temperature changes
Data Source
AI summary
Waveguide connectors include a ferrule having first alignment features. A waveguide has one or more a topclad portions, each with a waveguide core, second alignment features fastened to the first alignment features, and underclad portion that is thicker than the one or more topclad portions.