Optical Isolator Reduces Crosstalk in Integrated Waveguides
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Solution Overview
Problem
Existing optical isolators in optical circuits struggle to effectively reduce optical crosstalk between integrated waveguides in compact micro/nano optical chips, which hinders the miniaturization of optical chips and increases interference.
Innovation Solution
The implementation of an optical isolator with vertically and horizontally expanded dimensions compared to the waveguides, positioned between the waveguides, utilizing a planar, columnar periodic, or grating structure, made from metallic or dielectric materials to enhance absorption and reduce crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple waveguides are integrated in a small area to miniaturize optical chips, then the size of the optical chip is reduced, but optical crosstalk between waveguides increases
Solution Approach 1:
An optical isolator is introduced as an intermediary component between adjacent waveguides to prevent optical crosstalk. The isolator includes an absorber positioned between the waveguides that selectively absorbs unwanted optical waves, allowing the waveguides to be placed closer together without increasing crosstalk interference.
Solution Approach 2:
The patent converts the harmful optical interference into a beneficial effect by using the absorber to selectively absorb the unwanted optical waves. The absorber is designed to absorb specific wavelengths that cause crosstalk while allowing desired optical signals to pass through, transforming the harmful interference into a useful isolation mechanism.
2Productivity
If distances between waveguides are reduced to enable miniaturization, then the integration density is improved, but optical interference between waveguides increases
Solution Approach 1:
The optical isolator acts as a mediator between waveguides, enabling reduced spacing while maintaining low interference. The isolator's absorber is positioned in the gap between waveguides to block unwanted optical coupling, allowing higher integration density without sacrificing signal integrity.
Solution Approach 2:
The absorber is strategically positioned at specific locations between waveguides where optical interference occurs. The local quality of the absorber is optimized to target specific wavelengths and interference patterns, providing localized isolation that enables closer waveguide spacing without uniform increases in interference throughout the entire structure.
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 configuration significantly reduces optical crosstalk between waveguides, allowing for the reduction of distances between waveguides without increasing interference, thereby facilitating the miniaturization of optical chips and improving the integration efficiency of optical circuits.
Implementation Method 1
utilizing a planar, columnar periodic, or grating structure, made from metallic or dielectric materials to enhance absorption and reduce crosstalk
Data Source
AI summary
A device includes an optical isolator disposed between adjacent optical waveguides along a direction. The optical isolator has vertical or horizontal dimensions that are different than at least one of the optical waveguides. The vertical and horizontal dimensions are greater than vertical and horizontal dimensions of at least one of the waveguides. In various embodiments, the structure of the optical isolator can be a planar structure, a columnar periodic structure, or a grating structure. The material of the optical isolator can be a metallic material or a dielectric material. In some embodiments, the optical isolator and the optical waveguides are used to enhance the performance of an optical multiplexing device.