Optical Modulation Element Electrode Segmentation for Loss Suppression
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Solution Overview
Problem
Conventional optical modulation elements face challenges in achieving high-frequency bandwidths above 64 Gbaud due to increased electrode loss and radiation loss at frequencies above 50 GHz, which affects high-speed communication performance.
Innovation Solution
The optical modulation element design eliminates the ground electrode in the nearby region of the interaction part, using differential signal electrodes and strategically placing ground electrodes at input and terminal parts to reduce ripple, crosstalk, and radiation loss, while maintaining low-frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ground electrode is provided in the nearby region of the interaction part, then low-frequency performance is improved, but radiation loss at high frequencies increases
Solution Approach 1:
The electrode structure is segmented into two distinct regions: the interaction part where no ground electrode is provided to minimize radiation loss, and the terminal parts where ground electrodes are provided to maintain low-frequency performance. This spatial segmentation resolves the contradiction by allowing different regions to optimize for different frequency ranges.
Solution Approach 2:
Different regions of the electrode structure are assigned different properties: the interaction part has no ground electrode (local quality A) to reduce radiation loss at high frequencies, while the terminal parts have ground electrodes (local quality B) to maintain low-frequency performance. This local differentiation allows simultaneous optimization for both frequency ranges.
2Speed
If ground electrode area is increased, then high-frequency operation is enabled, but device complexity increases
Solution Approach 1:
The ground electrode is extracted from the interaction part region, removing it from areas where it would cause complexity and performance degradation. By taking out the ground electrode only from the necessary region while keeping it at terminal parts, the solution achieves high-frequency operation without proportionally increasing overall device 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
This configuration effectively suppresses radiation loss at high frequencies and electrode loss at low frequencies, enabling high-speed communication beyond 64 Gbaud with improved high-frequency characteristics.
Implementation Method 1
first and second optical waveguides 10a and 10b which are formed adjacent to each other on the substrate 2
Implementation Method 2
an optical waveguide (Mach-Zehnder optical waveguide) having a Mach-Zehnder interferometer structure
Data Source
AI summary
To provide an optical modulation element capable of suppressing electrode loss at a low frequency of 50 GHz or less, and suppressing radiation loss at a high frequency of 50 GHz or more. An optical modulation element comprises: a substrate; and at least one interaction part provided on the substrate. The interaction part includes: first and second optical waveguides formed adjacent to each other on the substrate; and first and second signal electrodes provided so as to oppose the first and second optical waveguides respectively. o ground electrode is provided in a nearby region of the interaction part, and a ground electrode is provided in the vicinity of at least one of an input part and a terminal part electrically connected to each of the first and second signal electrodes.