Organic Electro-Optic Modulators with TCO Electrodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current high-speed electro-optic (EO) optical intensity modulators, particularly those based on lithium niobate crystals, require high electrical power for switching due to high on/off switching voltages, which is inefficient and limits their performance in high-bit-rate optical communications and RF photonics applications.
Innovation Solution
The development of EO modulators using transparent conducting oxide (TCO) electrodes with appropriate electrical and optical characteristics, which reduce the switching power and enable compact device structures by directly applying the switching voltage across an organic core component, thereby lowering the voltage-length product and achieving efficient electrical-to-optical signal-power conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If lithium niobate crystal-based EO modulators are used to achieve high-speed optical intensity modulation, then the modulation speed is improved, but the electrical power consumption increases significantly due to high switching voltages
Solution Approach 1:
The patent changes the material parameter from lithium niobate to organic electro-optic materials with higher electro-optic coefficients, and modifies the device structure to use TCO electrodes with direct voltage application across the organic core. This parameter change reduces the switching voltage from ~5V to sub-1V range while maintaining high-speed modulation capability
Solution Approach 2:
The patent transitions from conventional metal electrode geometry to TCO electrode bridges that extend laterally across the organic core. This dimensional change allows direct voltage application across the electro-optic material without requiring high voltage, enabling low-power high-speed operation
2Reliability
If high switching voltages are applied to achieve effective optical intensity modulation, then the modulation depth is improved, but the electrical-to-optical signal-power conversion efficiency deteriorates
Solution Approach 1:
The patent changes the electro-optic material parameter (higher electro-optic coefficient of organic materials) and electrical parameter (lower switching voltage) to achieve both deep modulation and high efficiency. The TCO electrode structure enables effective voltage application across the organic core at low voltage levels
Solution Approach 2:
The patent uses a composite structure combining TCO electrodes with organic electro-optic materials. This composite approach leverages the transparent conducting properties of TCO and the high electro-optic coefficient of organic materials to achieve efficient electrical-to-optical conversion with deep modulation
3Ease of operation
If conventional metal electrode structures are used to apply switching voltage, then the electrical connection is simplified, but the device size increases and integration density decreases
Solution Approach 1:
The patent uses TCO electrode bridges that extend laterally across the organic core in the horizontal dimension, eliminating the need for vertical metal electrode structures. This dimensional change reduces device footprint while maintaining effective voltage application across the electro-optic material
Solution Approach 2:
The patent employs thin-film TCO electrodes instead of bulky metal structures. These thin-film electrode bridges provide effective electrical connection while occupying minimal space, enabling compact device design and high integration density
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 approach results in a significant reduction in switching power, enabling high-speed and compact modulators suitable for next-generation optical fiber communication systems and RF photonics, with a power-length product that is 100-fold lower than conventional designs, allowing for sub-1V operation and broad frequency bandwidth.
Implementation Method 1
electro-optic (EO) optical intensity modulators... convert electrical signals to optical signals... modulating the light intensity in optical fibers with analog high-frequency signals by using EO modulators
Data Source
AI summary
Electro-optic (EO) modulator and related device structures which can be used in conjunction with high EO materials to lower switching voltage and improve related performance parameters.