Mach-Zehnder Waveguide Electrode Layout for Intersection Noise
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Solution Overview
Problem
Optical waveguide devices with convex optical waveguides and signal electrodes experience significant disturbance modulation at intersections, leading to noise that affects optical modulation operations, particularly in folded configurations with increased intersections.
Innovation Solution
The optical waveguide device incorporates a substrate with an intermediate layer of varying thickness and signal line configurations to manage signal propagation velocities and clearances at intersections, ensuring faster propagation in the intersection regions to enhance canceling effects of disturbance modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If convex optical waveguides are used to strengthen interaction between signal electric field and guided light, then miniaturization and low-voltage driving are achieved, but disturbance modulation noise increases at intersections
Solution Approach 1:
The patent applies local quality by making the intermediate layer thickness non-uniform: it is thinner at intersection regions and thicker at non-intersection regions. This local variation in thickness optimizes the electric field distribution specifically at intersections where disturbance modulation occurs, while maintaining strong interaction in other regions. The different thickness zones create different electric field intensities where needed, resolving the contradiction between miniaturization and noise reduction.
Solution Approach 2:
The patent changes the physical parameter of the intermediate layer thickness to control signal propagation velocity. By making the thickness non-uniform (thinner at intersections, thicker elsewhere), the signal propagation velocity is increased at intersection regions, allowing differential signals to arrive simultaneously and cancel disturbance modulation noise. This parameter change resolves the contradiction by optimizing the electric field interaction locally without sacrificing overall miniaturization.
2Ease of operation
If signal electrodes extend to the outer periphery for connection, then electrical connection is achieved, but the number of intersections between signal electrodes and optical waveguides increases
Solution Approach 1:
The patent applies local quality by varying the intermediate layer thickness specifically at intersection regions where signal electrodes cross optical waveguides. The thinner intermediate layer at these locations increases signal propagation velocity locally, compensating for the increased number of intersections. This allows the signal electrodes to extend to the periphery for easy connection while managing the complexity of multiple intersections through localized parameter optimization.
3Adaptability or versatility
If folded optical waveguide configuration is used to integrate optical input and output on one side, then device integration is achieved, but the number of intersections and disturbance modulation noise increase
Solution Approach 1:
The patent applies local quality by making the intermediate layer thickness non-uniform, specifically thinner at the intersection regions created by the folded configuration and thicker in other regions. This local thickness variation increases signal propagation velocity at the intersections, enabling differential signals to arrive simultaneously and cancel the disturbance modulation noise that inevitably increases due to the folded structure's multiple intersections.
4Ease of manufacture
If uniform intermediate layer thickness is used, then manufacturing simplicity is maintained, but signal propagation velocity cannot be optimized at intersections
Solution Approach 1:
The patent resolves this contradiction by implementing local quality through non-uniform intermediate layer thickness. The thickness is varied specifically at intersection regions (thinner) versus non-intersection regions (thicker), which can be achieved through selective etching or deposition processes. This approach maintains reasonable manufacturing simplicity while optimizing signal propagation velocity at the critical intersection locations to ensure proper differential signal timing and noise cancellation.
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 configuration effectively reduces disturbance modulation noise, improving the operating characteristics of optical waveguide devices by maintaining phase coherence of differential signals across intersections.
Implementation Method 1
The optical waveguide device incorporates a substrate with an intermediate layer of varying thickness and signal line configurations to manage signal propagation velocities and clearances at intersections, ensuring faster propagation in the intersection regions to enhance canceling effects of disturbance modulation.
Implementation Method 2
an optical modulator incorporating an optical modulation device as an optical waveguide device including an optical waveguide formed on a substrate and a control electrode for controlling light waves propagating in the optical waveguide
Data Source
AI summary
An optical waveguide device including: an optical waveguide composed of a protruding portion extending on a substrate; a signal electrode that is formed on the substrate and controls light waves propagating through the optical waveguide, in which the optical waveguide includes a Mach-Zehnder optical waveguide including two parallel waveguides having curved portions, the signal electrode includes two signal lines for transmitting a differential signal, respectively intersecting the two parallel waveguides at the curved portions, and in an intersection region, which is a region on the substrate where the two signal lines and the two parallel waveguides intersect, at least one of the two signal lines has a signal propagation velocity faster than in a portion other than the intersection region or one of the two signal lines has a signal propagation velocity faster than an other signal line.