Optical Modulator Electrode Order for Compact RF Design
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Solution Overview
Problem
Highly integrated optical modulators face challenges in size reduction while maintaining performance and density, leading to increased sizes due to complex wire arrangements for modulation electrodes with different wavelengths, which also deteriorate radio frequency characteristics.
Innovation Solution
The optical modulator design features modulation and bias electrodes arranged in a specific order for each wavelength on a substrate, with RF and DC interfaces positioned on one side of the housing, allowing for efficient wire arrangement and reduction in substrate size, and utilizing substrates with electro-optic effects like LiNbO3 for Mach-Zehnder-type waveguides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple control electrodes are provided for dual-wavelength modulation, then modulation functionality is improved, but wire arrangement complexity increases and device size increases
Solution Approach 1:
The patent combines the RF signal input interfaces for both wavelengths into a single shared interface, and similarly combines DC signal input interfaces. This merging approach reduces the number of separate wire connections needed while maintaining the ability to independently modulate both wavelengths, thereby reducing wire arrangement complexity without sacrificing modulation functionality.
Solution Approach 2:
The shared RF and DC interfaces serve multiple functions by providing signals to both wavelength modulation paths. The single RF interface distributes signals to both first and second modulation electrodes, and the DC interface similarly serves both bias electrode pairs, making the interface structure universal rather than dedicated to each wavelength separately.
2Adaptability or versatility
If multiple control electrodes are provided for dual-wavelength modulation, then modulation functionality is improved, but device size increases
Solution Approach 1:
By merging the RF and DC interface structures to serve both wavelengths, the patent reduces the overall footprint required for interface connections. The shared interfaces eliminate the need for separate dedicated connection areas for each wavelength, thereby reducing device size while maintaining dual-wavelength modulation capability.
Solution Approach 2:
The patent arranges the modulation electrodes and interfaces in a compact configuration that utilizes spatial optimization. The first and second modulation electrodes are positioned to share common interface locations, and the bias electrodes are arranged to share DC interfaces, creating a two-dimensional optimization that reduces overall device area.
3Reliability
If wire length is reduced for RF characteristics, then signal quality is improved, but electrode arrangement flexibility is reduced
Solution Approach 1:
The patent applies different arrangement strategies to different electrode types based on their specific requirements. The modulation electrodes are positioned to minimize RF signal path length and maximize RF characteristic performance, while the bias electrodes are arranged to provide appropriate DC biasing. This localized optimization allows each electrode type to be arranged according to its specific functional requirements.
Solution Approach 2:
The patent segments the electrode arrangement into distinct functional groups: modulation electrodes with shared RF interfaces optimized for RF performance, and bias electrodes with shared DC interfaces optimized for DC biasing requirements. This segmentation allows independent optimization of each group's arrangement without compromising the other, maintaining both RF characteristic quality and arrangement flexibility.
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 simplifies wire arrangement, reduces modulator size, and minimizes radio frequency characteristic deterioration by optimizing electrode order and interface placement, while maintaining performance across different wavelengths.
Implementation Method 1
a first optical modulation region modulating light having a first wavelength and a second optical modulation region modulating light having a second wavelength are formed on a substrate having an electro-optic effect
Data Source
AI summary
Modulation electrodes, bias electrodes, and bias electrodes are disposed in this order in a light wave-travelling direction in an optical modulation region modulating light having a wavelength. On the other hand, in an optical modulation region modulating light having a wavelength, the bias electrodes, the bias electrodes, and the modulation electrodes are disposed in this order in the light wave-travelling direction. That is, an order of the modulation electrodes and the bias electrodes in a longitudinal direction of a substrate is changed for each of the wavelengths.