Optical Waveguide Slit Structure for Low-Voltage Modulation
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Solution Overview
Problem
Conventional optical modulators using film optical waveguides face inefficiencies in electric field application due to thick buffer layers, which reduce the electric field strength and increase drive voltage requirements.
Innovation Solution
Incorporating slits in the buffer layer of the optical waveguide structure, allowing the electrode to extend closer to the film optical waveguide, thereby maintaining strong electric field application efficiency even with thicker buffer layers, reducing drive voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a thick buffer layer is used to prevent light absorption into electrodes, then light protection is improved, but electric field application efficiency deteriorates
Solution Approach 1:
The buffer layer is segmented by forming slits that divide it into multiple regions. This segmentation allows the electrode to extend closer to the optical waveguide through the slits, creating localized regions of strong electric field while maintaining the overall thick buffer layer structure for light protection. The slits effectively partition the buffer layer into functional zones: light-blocking regions and electric field application regions.
Solution Approach 2:
The slits act as intermediaries that enable the electrode to reach closer to the optical waveguide without requiring a thin buffer layer. By providing these intermediate pathways, the slits allow the electrode to penetrate through the thick buffer layer and establish strong electric field coupling with the optical waveguide, while the remaining buffer layer material continues to provide light absorption protection.
2Object-affected harmful factors
If the buffer layer thickness is increased to protect against light absorption, then light shielding is improved, but drive voltage increases
Solution Approach 1:
The buffer layer is divided into multiple regions through slits, creating localized access points for the electrode. This segmentation enables the electrode to extend closer to the optical waveguide in specific regions, generating strong electric fields that reduce the overall drive voltage requirement while the thick buffer layer remains intact for light protection.
Solution Approach 2:
The buffer layer is given different local qualities: in regions with slits, the buffer layer is thinner or interrupted to allow strong electric field coupling and low drive voltage; in regions without slits, the buffer layer remains thick to provide light absorption protection. This local differentiation resolves the contradiction between light shielding and drive voltage.
3Use of energy by moving object
If the electrode is positioned closer to the optical waveguide to improve electric field efficiency, then modulation efficiency is improved, but light absorption by the electrode increases
Solution Approach 1:
The buffer layer is segmented into light-blocking regions and electric field application regions through the formation of slits. In the electric field application regions (where slits are present), the electrode can extend closer to the optical waveguide for efficient coupling. In other regions, the intact thick buffer layer prevents light absorption by the electrode.
Solution Approach 2:
The buffer layer structure is differentiated locally: in areas where the electrode needs to be close to the waveguide for efficient modulation, the buffer layer is interrupted by slits; in areas where light protection is the priority, the buffer layer remains continuous and thick. This local quality variation allows simultaneous achievement of both goals.
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 slit design enhances electric field application efficiency, allowing for lower drive voltages while preventing light absorption into the electrodes, thus improving the overall performance of the optical modulator.
Implementation Method 1
when a voltage is applied to the signal electrode, an electric field is generated in the optical waveguide and accordingly the refractive index of the optical waveguide varies and the phase of light varies
Implementation Method 2
the buffer layer 204 makes it possible to prevent light that propagates through the film optical waveguides 207 from being absorbed into the signal electrode 205 and the ground electrodes 206
Data Source
AI summary
An optical device includes an optical waveguide, a buffer layer that is layered on the optical waveguide, and an electrode that is arranged on a surface of the buffer layer that is layered in a part near the optical waveguide and that applies an electric signal to the optical waveguide. The optical device further includes a slit that is formed in the buffer layer, that extends from the surface of the buffer layer to a vicinity of the optical waveguide, and that is filled with part of the electrode.