Optical Waveguide Insulating Layer Height for Foreign Matter Protection
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Solution Overview
Problem
Optical waveguide devices with convex waveguides face fluctuations in electrical characteristics due to foreign matter adhesion, which can lead to malfunction, and existing solutions compromise electrode design freedom or fail to maintain velocity matching between electrical and light signals.
Innovation Solution
An optical waveguide device with a substrate, a convex optical waveguide, and insulating layers where the first insulating layer is taller than the electrodes, reducing foreign matter adherence and maintaining electrode design flexibility by controlling the height and position of the insulating layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clearance between control electrodes is narrowed to improve electric field efficiency, then electric field efficiency increases, but the likelihood of electrical bridge formation due to foreign matter increases
Solution Approach 1:
The patent introduces a height dimension to the insulating layer configuration, making it protrude above the electrode surfaces. This vertical extension creates a physical barrier that prevents foreign matter from bridging between electrodes, effectively adding a protective dimension without altering the horizontal electrode spacing required for electric field efficiency.
Solution Approach 2:
The insulating layer acts as an intermediary protective structure between the control electrodes and foreign matter. By positioning the insulating layer to cover and extend above the electrodes, it serves as a mediator that blocks foreign matter adhesion while allowing the electrodes to maintain their optimized clearance for electric field generation.
2Object-affected harmful factors
If a thin dielectric layer is formed to protect the electrode, then foreign matter protection improves, but electric field distribution and capacitance change
Solution Approach 1:
The insulating layer is applied selectively and locally to cover only the electrode regions where foreign matter adhesion is a concern. The layer extends vertically above the electrodes rather than forming a uniform thick layer across the entire device, providing localized protection while minimizing impact on overall electric field distribution and capacitance.
3Object-affected harmful factors
If a thick dielectric layer is formed to reduce characteristic variation, then foreign matter protection improves, but velocity matching between electrical and light signals deteriorates
Solution Approach 1:
The protective function is achieved by extending the insulating layer vertically above the electrodes rather than increasing its horizontal thickness. This vertical extension provides foreign matter protection without adding significant dielectric material in the signal propagation path, thereby preserving velocity matching between electrical and optical signals.
Solution Approach 2:
The insulating layer provides concentrated protection at the electrode surfaces where foreign matter adhesion occurs, rather than forming a uniformly thick layer throughout the device. This localized approach ensures foreign matter protection while minimizing the overall dielectric volume that could affect signal propagation velocity.
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
Prevents electrical characteristic fluctuations from foreign matter while ensuring electrode design freedom and maintaining signal velocity matching, enhancing the reliability and efficiency of the optical waveguide device.
Implementation Method 1
a first insulating layer disposed between two adjacent electrodes among the electrodes, in which a height of the first insulating layer from a surface of the substrate is higher than heights of the two electrodes
Implementation Method 2
an optical waveguide formed on the substrate; a first insulating layer disposed between two adjacent electrodes among the electrodes
Implementation Method 3
an optical modulator using a rib-type optical waveguide or a ridge optical waveguide formed on the surface of a thin-film LN substrate... an optical modulation device using LiNbO3 (hereinafter, also referred to as LN) having an electro-optic effect
Data Source
AI summary
An optical waveguide device that can prevent fluctuations in electrical characteristics due to adhesion of foreign matter to electrodes without adversely affecting the degree of freedom in electrode design. The optical waveguide device includes a substrate, an optical waveguide formed on the substrate, an electrode for controlling a light wave propagating through the optical waveguide, and a first insulating layer disposed between two adjacent electrodes among the electrodes, in which the first insulating layer has a height from a surface of the substrate that is higher than heights of the two electrodes.