Optical Modulator Low Dielectric Buffer Layer
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Solution Overview
Problem
Optical modulators in existing optical communication systems suffer from optical loss and limited modulation frequency due to the absorption of light by signal electrodes and the lack of a buffer layer, which affects the refractive index difference between electrical signals and light waves.
Innovation Solution
Incorporating a low dielectric constant layer between the optical waveguide and the control electrodes, with the electrodes positioned obliquely to reduce contact area and using a low dielectric constant material to minimize light absorption and adjust refractive indices, thereby reducing optical loss and increasing modulation frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the signal electrode is aligned with the optical waveguide in the thickness direction with a rectangular shape, then the control electrode can effectively control the light passing through the waveguide, but light leaking from the optical waveguide is absorbed by the signal electrode causing optical loss
Solution Approach 1:
A buffer layer is introduced as an intermediary substance between the signal electrode and the optical waveguide. This buffer layer prevents direct contact between the electrode and waveguide, thereby stopping light absorption by the electrode while still allowing electrical control to function effectively.
2Device complexity
If no buffer layer is formed between the first electrode and the thin plate, then the device structure is simpler, but the difference between the effective refractive index experienced by electrical signals and light waves is not reduced, preventing modulation frequency increase
Solution Approach 1:
The buffer layer changes the effective refractive index parameter experienced by electrical signals. By adjusting this parameter through the buffer layer's dielectric properties, the patent reduces the refractive index difference between electrical and optical signals, enabling higher modulation frequencies.
3Productivity
If a buffer layer is formed between the first electrode and the thin plate, then the effective refractive index difference is reduced and modulation frequency can be increased, but the device structure becomes more complex
Solution Approach 1:
The buffer layer is applied locally only where needed - between the electrode and the optical waveguide - rather than throughout the entire device. This localized application provides the necessary refractive index adjustment and frequency enhancement while minimizing overall structural complexity.
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 solution effectively reduces optical loss and enhances modulation frequency by minimizing light absorption and refractive index differences, improving the performance of optical modulators in optical communication systems.
Implementation Method 1
an optical waveguide made of a material having an electro-optic effect
Data Source
AI summary
An optical modulator includes an optical waveguide, a first electrode, a second electrode, and a low dielectric constant layer. The optical waveguide is made of a material having an electro-optic effect. The first and second electrodes generate a potential difference with each other. In a cross-sectional view in a direction perpendicular or substantially perpendicular to an extending direction of the optical waveguide, the first electrode is on first side of the optical waveguide in a width direction and on first side of the optical waveguide in a thickness direction, the second electrode is on the second side of the optical waveguide in the width direction and on the second side of the optical waveguide in the thickness direction, the low dielectric constant layer is interposed between the first electrode and the optical waveguide, and a portion of the first electrode adjacent to the optical waveguide is in the low dielectric constant layer.