Optical Waveguide Package With Differential Bonding for Thermal Stress
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Solution Overview
Problem
Existing optical waveguide packages face separation issues due to high thermal stress between the substrate and the optical waveguide, which is exacerbated by the adhesive layer used for bonding, leading to potential failure over time.
Innovation Solution
The optical waveguide package incorporates a substrate with distinct bonding portions, where a first portion has reduced bonding strength to alleviate thermal stress and a second portion with higher bonding strength to the cladding, enhancing the overall adhesion and reducing thermal expansion-related separation risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive layer is used to bond the substrate and optical waveguide, then bonding strength is improved, but thermal stress increases causing separation
Solution Approach 1:
The substrate is designed with two distinct portions having different bonding strengths: a first portion with lower bonding strength to reduce thermal stress, and a second portion with higher bonding strength to ensure adequate adhesion. This local differentiation allows the system to simultaneously achieve sufficient bonding while minimizing thermal stress-induced separation.
2Ease of manufacture
If uniform bonding strength is applied across the substrate, then manufacturing is simplified, but thermal expansion causes separation
Solution Approach 1:
The substrate incorporates spatially varying bonding characteristics with a first portion designed for stress reduction and a second portion for strong adhesion. This local quality differentiation resolves the contradiction by allowing non-uniform bonding that specifically addresses thermal expansion issues while remaining manufacturable through controlled material composition or structural design in different regions.
3Strength
If high bonding strength is used throughout the optical waveguide package, then adhesion is improved, but thermal stress leads to separation over time
Solution Approach 1:
The differentiated substrate design maintains strong adhesion in the second portion while the first portion acts as a stress-relief zone. This local quality approach ensures long-term reliability by preventing the accumulation of thermal stress that would otherwise lead to separation over time, while still providing sufficient bonding strength where needed.
Solution Approach 2:
The substrate is segmented into functionally distinct first and second portions with different bonding characteristics. This segmentation allows the system to optimize different regions for different purposes: one region for stress management and another for strong adhesion, thereby improving long-term durability without sacrificing overall bonding performance.
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 reduces thermal stress and enhances the bonding strength between the substrate and the optical waveguide, minimizing separation and improving the long-term reliability of the light-emitting device.
Implementation Method 1
The second portion bonds to the cladding with a higher bonding strength than the first portion
Data Source
AI summary
An optical waveguide package includes a substrate having a first surface, and an optical waveguide layer including a cladding located on the first surface and a core located in the cladding. The substrate includes a first portion and a second portion being in contact with the cladding. The second portion bonds to the cladding with a higher bonding strength than the first portion.