Optical Waveguide Clad Layer Stress Dispersion
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Solution Overview
Problem
The existing optical waveguide apparatus experiences stress concentration and potential cracking or peeling issues during Thermal Cycle tests due to the design of the first and second clad layers, leading to reduced manufacturing yield and reliability.
Innovation Solution
The optical waveguide apparatus is designed with a first clad layer and a second clad layer, where at least one of the layers comprises both fully cured and semi-cured portions, with the semi-cured portion being strategically located at the outer peripheral area of the second clad layer to disperse stress, and the fully cured portion covering the core layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the outer peripheral portion of the second clad layer is disposed on the upper surface of the first clad layer, then the optical waveguide structure is formed, but stress concentrates at contact portions causing cracking or peeling during Thermal Cycle tests
Solution Approach 1:
The patent applies local quality by creating different curing states in different regions of the clad layer. The outer peripheral portion is kept in a semi-cured state while the inner portion is fully cured, giving each region different mechanical properties suitable for its function. This gradient curing structure reduces stress concentration at the contact portions between clad layers during thermal cycling.
2Ease of manufacture
If the outer peripheral portion of the second clad layer contacts the upper surface of the first clad layer, then the optical waveguide is constructed, but manufacturing yield decreases due to cracking and peeling
Solution Approach 1:
The patent applies preliminary action by pre-forming the clad layer structure with differentiated curing states before final assembly. The outer peripheral portion is intentionally left semi-cured during the layer formation process, creating a stress-absorbing structure in advance that prevents cracking and peeling during subsequent thermal cycling, thereby maintaining high manufacturing yield.
3Shape
If the outer peripheral portion of the second clad layer contacts the upper surface of the first clad layer, then the optical waveguide structure is complete, but reliability is insufficient under thermal stress
Solution Approach 1:
The patent applies parameter changes by modifying the curing degree parameter of the clad layer material. By controlling the curing process to create a gradient where the outer peripheral portion remains semi-cured while the inner portion is fully cured, the material's mechanical properties are optimized to resist thermal stress, significantly improving reliability under thermal cycling conditions.
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 design effectively disperses stress during Thermal Cycle tests, preventing cracking and peeling, thereby improving the manufacturing yield and reliability of the optical waveguide apparatus.
Implementation Method 1
stress is apt to be concentrated at contact portions between side surfaces of the outer peripheral portion of the second clad layer and the upper surface of the first clad layer
Data Source
AI summary
There is provided an optical waveguide apparatus. The optical waveguide apparatus includes: a first clad layer; a core layer formed on the first clad layer; and a second clad layer formed on the first clad layer to cover the core layer. At least one of the first clad layer and the second clad layer includes a fully cured portion and a semi-cured portion.