Tunable Material Grating Coupler for Compact Optical Phased Arrays
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Solution Overview
Problem
Conventional optical phased-array systems using Mach-Zehnder interferometer (MZI) modulators have a large form factor due to a weak electro-optic effect, resulting in a significant footprint, which is inefficient for photonics chip applications.
Innovation Solution
A structure incorporating a grating coupler with tunable material layers having a refractive index that can be adjusted by applied voltage, allowing for switching between different states for optical signal transmission, thereby reducing the footprint and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Mach-Zehnder interferometer (MZI) modulators are used for switching optical antennas, then optical signal transmission can be achieved, but the form factor becomes large due to weak electro-optic effect
Solution Approach 1:
The patent changes the material parameter by using materials with strong electro-optic effects (such as lithium niobate, barium titanate, or lead zirconate titanate) instead of conventional materials. This parameter change enables much stronger interaction between the applied voltage and the optical signal, allowing for compact MZI modulator designs that achieve the same switching functionality with a significantly reduced footprint.
Solution Approach 2:
The patent employs composite material structures that combine materials with strong electro-optic effects with other functional materials to create integrated photonic devices. These composite structures enable both strong electro-optic modulation and efficient optical confinement within a compact volume, resolving the contradiction between transmission capability and device size.
2Adaptability or versatility
If conventional optical phased-array systems are used, then optical signal handling can be achieved, but the footprint is significant which is inefficient for photonics chip applications
Solution Approach 1:
The patent transitions from planar two-dimensional integration to three-dimensional vertical stacking of photonic components. By stacking multiple functional layers (waveguides, modulators, gratings) in the vertical dimension, the system achieves full optical signal handling capabilities while compressing the horizontal footprint, making it suitable for compact photonics chip applications.
Solution Approach 2:
The patent introduces dynamically controllable parameters through voltage-tunable materials and reconfigurable waveguide structures. This enables the optical phased-array to adaptively change beam steering angles, focal points, and signal routing in real-time, providing versatile optical signal handling within a compact footprint through dynamic rather than static configuration.
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 use of tunable material layers enables efficient switching of the grating coupler, reducing the footprint of optical phased-array systems and enhancing optical signal handling capabilities, making them more suitable for photonics chip applications.
Implementation Method 1
The first and second layers are each composed of a tunable material having a refractive index that is a function of a voltage applied to the first and second layers
Data Source
AI summary
Structures that include an optical component, such as a grating coupler, and methods of fabricating a structure that includes an optical component, such as a grating coupler. First and second layers are arranged over the optical component with the first layer arranged between the second layer and the optical component. The first and second layers are each composed of a tunable material having a refractive index that is a function of a bias voltage applied to the first layer and the second layer.