Optical Modulator Multi-Electrode Layout for Efficiency and Bandwidth
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Solution Overview
Problem
Optical modulators, such as Mach-Zehnder modulators, suffer from low modulation efficiency due to inefficient conversion of electrical signals into optical signals, leading to wasted drive signals and reduced modulation quality.
Innovation Solution
The optical modulator incorporates additional signal electrodes and ground electrodes, along with symmetric and dummy waveguides, to enhance voltage amplitude and reduce signal losses, thereby improving modulation efficiency and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If additional signal electrodes and ground electrodes are added to increase voltage amplitude, then modulation efficiency is improved, but device complexity increases
Solution Approach 1:
The modulator is divided into multiple waveguide regions (first, second, third waveguides) with separate signal electrodes and ground electrodes applied to different segments. This segmentation allows independent voltage control of each waveguide section, enabling efficient modulation while maintaining manageable structural complexity through modular design
Solution Approach 2:
Multiple signal electrodes and ground electrodes are merged into a coordinated system where first, second, and third signal electrodes work together with their corresponding ground electrodes. The merging of these electrode systems creates a composite electric field that achieves high voltage amplitude for improved modulation efficiency without requiring a single complex electrode structure
2Device complexity
If asymmetric electrode distribution is used, then device complexity is reduced, but optical losses increase and modulation quality deteriorates
Solution Approach 1:
The patent intentionally employs asymmetric electrode distribution where the first signal electrode has different positioning relative to its ground electrode compared to the second and third signal electrodes. This controlled asymmetry simplifies the overall device structure while the third waveguide compensates for optical loss imbalances, maintaining modulation quality without requiring perfect symmetry
3Device complexity
If high-frequency electrical signals are transmitted through asymmetric electrodes, then device complexity is reduced, but signal attenuation increases and modulation bandwidth decreases
Solution Approach 1:
Different regions of the modulator are designed with locally optimized electrode configurations. The first waveguide region has its own signal and ground electrodes with specific spacing and geometry tailored for its function, while the second and third waveguides have different electrode arrangements. This local optimization allows each region to handle high-frequency signals with minimal attenuation, preserving modulation bandwidth while keeping overall device complexity manageable
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 enhanced optical modulator increases modulation efficiency and bandwidth by optimizing signal distribution and reducing signal losses, resulting in improved modulation quality and flexibility.
Implementation Method 1
The beam splitter is configured to split a received optical carrier into two optical carriers
Implementation Method 2
The beam combiner is configured to perform interference on the first optical phase modulation signal and the second optical phase modulation signal, to output a modulated optical signal
Data Source
AI summary
An optical modulator includes a beam splitter, a first ground electrode, a first waveguide, a first signal electrode, a second waveguide, a second signal electrode, and a beam combiner. An output end of the beam splitter is connected to input ends of the first waveguide and the second waveguide. An input end of the beam combiner is connected to output ends of the first waveguide and the second waveguide. The first signal electrode is located between the first waveguide and the second waveguide. The first waveguide is located between the first ground electrode and the first signal electrode. The second waveguide is located between the first signal electrode and the second signal electrode.