Optical Waveguide Glass Composition for Low Silver Ion Diffusion
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Solution Overview
Problem
Existing glass compositions for optical waveguides in photonic chip packages suffer from high silver ion mobility at operational temperatures, leading to rapid degradation of waveguide performance and short lifespan, failing to meet the thermal and mechanical stability requirements of high-performance silicon photonics systems.
Innovation Solution
A glass composition with specific ranges of SiO2, Al2O3, Na2O, and Cs2O/Rb2O, among other components, is formulated to limit silver ion diffusivity to less than 5×10−19 m2/s at operational temperatures, ensuring long-term stability and low propagation loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional glass compositions are used for optical waveguides, then waveguide formation is achieved, but silver ion mobility remains high at operational temperatures causing rapid degradation and short lifespan
Solution Approach 1:
The patent modifies the glass composition by adjusting the ratios of specific oxides (Al2O3, Na2O, B2O3, SiO2) to change the physical and chemical parameters of the glass matrix. This alters the diffusion characteristics of silver ions, reducing their mobility at operational temperatures while maintaining waveguide functionality. The specific parameter changes in composition directly address the harmful silver ion mobility issue.
Solution Approach 2:
The invention creates a composite glass material combining multiple oxide components in specific proportions. This composite structure provides both the necessary optical properties for waveguide formation and the chemical stability to suppress silver ion migration. The synergistic interaction between different glass formers and modifiers creates a matrix that simultaneously enables waveguide functionality and prevents degradation.
2Stability of the object's composition
If glass composition is optimized to reduce silver ion diffusivity, then waveguide stability improves, but manufacturing complexity increases due to precise composition control requirements
Solution Approach 1:
The patent establishes specific parameter ranges for each oxide component that balance stability requirements with manufacturability. By defining clear compositional windows (e.g., Al2O3: 3-15 mol%, Na2O: 8-16 mol%), the invention makes the complex composition control achievable through standard manufacturing processes while maintaining the necessary silver ion diffusivity suppression.
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
The glass composition enables optical waveguides with a usable lifespan of five years or more in environments up to 110°C, maintaining low propagation loss and supporting high-performance applications like data centers and telecommunications.
Implementation Method 1
the glass composition has a first silver ion diffusivity at 110° C. of 5×10−19 m2/s or less
Implementation Method 2
the optical waveguides are integrated in PCBs and are optically connected to optical fibers
Data Source
AI summary
Disclosed herein are embodiments of a glass composition including SiO2 in an amount in a range from 53 mol % to 84 mol %, Al2O3 in an amount in a range from 0.3 mol % to 20 mol %, Na2O in an amount in a range from 3 mol % to 16 mol %, and at least one of Cs2O or Rb2O in an amount in a range from 0.05 mol % to 8 mol %. The glass composition has a first silver ion diffusivity at 110° C. of 5×10−19 m2/s or less, and the glass composition has a second silver ion diffusivity at 350° C. of at least 5×10−17 m2/s at 350° C. The glass composition is particularly suitable for use as a glass substrate of a photonic chip package.