Optical Modulator Electrode Impedance Layout for Stable Low-Power Drive
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Solution Overview
Problem
Existing optical modulators using LN substrates face issues with power consumption inefficiency and instability due to strict manufacturing tolerances and environmental fluctuations, particularly when using drive circuit elements designed for semiconductor optical modulation devices.
Innovation Solution
An optical modulator design with a signal electrode having multiple sections of varying impedances and termination resistors, where one high-frequency signal is terminated by a lower resistance resistor, and the other by a higher resistance resistor, along with a signal electrode configured to reduce impedance changes, thereby optimizing power consumption and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a drive circuit element designed for semiconductor optical modulation devices is used to drive an LN optical modulation device, then power consumption is reduced, but manufacturing precision requirements become extremely strict and operational stability deteriorates
Solution Approach 1:
An impedance matching circuit is introduced as an intermediary component between the drive circuit element and the signal electrode. This intermediary circuit gradually transforms the impedance from the drive circuit to match the signal electrode impedance, eliminating the need for extremely strict manufacturing precision while maintaining stable operation and reducing power consumption.
Solution Approach 2:
The impedance parameter of the signal electrode is changed by introducing a grounding electrode adjacent to it. This parameter change allows the signal electrode to have a higher impedance that is easier to manufacture, while the impedance matching circuit ensures stable power transfer from the drive circuit, thus resolving the contradiction between power consumption and manufacturing precision.
2Reliability
If one high-frequency signal is input to one signal electrode, then operational stability is improved, but power consumption efficiency deteriorates due to wasted power from the other signal
Solution Approach 1:
The impedance of the signal electrode is changed by introducing a grounding electrode, which allows the electrode to operate stably with a single high-frequency signal while improving power consumption efficiency. The impedance matching circuit ensures that the power from the drive circuit is efficiently transferred to the signal electrode without waste.
Solution Approach 2:
The impedance matching circuit acts as an intermediary that efficiently couples the drive circuit to the signal electrode with modified impedance. This ensures that power from the drive circuit is fully utilized by the signal electrode, eliminating power waste while maintaining operational stability.
3Ease of manufacture
If the signal electrode has constant impedance, then manufacturing is easier, but power consumption and reflection are not optimized
Solution Approach 1:
The impedance of the signal electrode is changed by introducing a grounding electrode adjacent to it. This parameter change allows the electrode to maintain constant impedance for easy manufacturing while the impedance matching circuit optimizes power consumption by efficiently transferring power from the drive circuit to the signal electrode.
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 design reduces power consumption and stabilizes operation by efficiently utilizing signal power, minimizing power waste and reflection, while maintaining modulation efficiency.
Implementation Method 1
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 modulator includes an optical waveguide device including an optical waveguide and a signal electrode for controlling a light wave propagating through the optical waveguide, a drive circuit that outputs two high-frequency signals, and two termination resistors for respectively terminating the two high-frequency signals, in which one high-frequency signal among the high-frequency signals output from the drive circuit propagates through the signal electrode of the optical waveguide device and is terminated by a first termination resistor that is one of the termination resistors, an other high-frequency signal among the high-frequency signals output from the drive circuit is terminated by a second termination resistor that is an other one of the termination resistors, a resistance value of the first termination resistor is lower than a resistance value of the second termination resistor, and the signal electrode includes a plurality of sections having constant impedances different from each other.