Surrounding-Electrode Electro-Optic Modulator for Low-Voltage Drive
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Solution Overview
Problem
Conventional electro-optic devices require high voltage and energy consumption, limiting their integration in modern communication systems and increasing the physical footprint and complexity of electro-optic circuits.
Innovation Solution
A low voltage-drive Electro-optic modulator (EOM) with a novel electrode design surrounding the waveguide, enhancing electric field density and optimizing electric-optical field overlap, fabricated on a monolithic Lithium Niobate thin film using standard semiconductor processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional electro-optic devices are used, then modulation function is achieved, but high voltage and high energy consumption are required
Solution Approach 1:
The patent applies local quality by concentrating the electric field density in specific regions through strategically positioned metal layers. The electric field is enhanced locally at the waveguide edges and within the modulation region, allowing efficient electro-optic modulation with reduced overall voltage. This localized field enhancement resolves the contradiction by achieving effective modulation without requiring high overall operating voltage and energy consumption.
Solution Approach 2:
The patent transitions from conventional planar electrode configurations to a three-dimensional metal layer structure that surrounds the waveguide. By adding vertical dimensionality with multiple metal layers at different heights and positions, the electric field overlap with the optical mode is significantly enhanced. This dimensional change allows achieving effective modulation at lower voltages, resolving the energy consumption versus operation voltage contradiction.
2Use of energy by stationary object
If modulation voltage is reduced, then energy efficiency improves, but device footprint and complexity increase
Solution Approach 1:
The patent merges multiple functions into the metal layer structure: the same metal layers that provide electrical grounding also serve to enhance the electric field density and confine the optical mode. By combining the grounding function with the electro-optic modulation function in a single integrated structure, the patent achieves low-voltage operation without proportionally increasing device complexity. The merged structure efficiently performs multiple roles simultaneously.
Solution Approach 2:
The metal layers are designed to serve multiple purposes: providing electrical reference potential, enhancing electric field density in the modulation region, confining optical modes, and potentially serving as thermal management pathways. This multi-functionality allows the device to achieve high energy efficiency without requiring separate dedicated structures for each function, thereby avoiding excessive complexity increase.
3Productivity
If electrode design is optimized for high electric field density, then modulation efficiency improves, but waveguide loss may increase
Solution Approach 1:
The patent introduces dielectric materials as intermediary layers between the metal electrodes and the waveguide core. These dielectric layers act as mediators that allow the metal layers to generate enhanced electric fields while preventing direct metal-waveguide contact that would cause optical absorption losses. The dielectric intermediaries enable high modulation efficiency through field enhancement while maintaining low waveguide loss by isolating the metal from the optical mode.
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
Reduces the half-wave voltage, enhances energy efficiency, and minimizes device footprint while maintaining low waveguide loss, enabling high-speed, low-power operation compatible with large-scale integration.
Implementation Method 1
The light is modulated in phase by electronic fields through electro-optical effects
Implementation Method 2
modulated in amplitude by the interference effect due to phase differences created by the electric field applied onto a modulation arm in an interferometer setting
Data Source
AI summary
An electro-optic modulation structure 110, a method for fabrication of the electro-optic modulation structure, and a method of optical modulation derived from an electro-optic modulation structure with low voltage of operation are disclosed. The low voltage operation of the electro-optic modulator is realized by designed electro-optic modulation structures that include the light confining waveguide 114, overclad layer 120 and modulating electrode structure 116 for applying modulation voltages that are directed towards a low voltage operation of the electro-optic modulation 110 device upon consideration of optimal optical loss. (FIG. 3).