Supplemental Waveguide-Enhanced Optical Coupling in Photonic Integrated Circuits
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Solution Overview
Problem
Photonic integrated circuits (PICs) face challenges in transmitting high-power optical signals due to power-induced damage, such as melting and defects, when waveguides with different refractive index profiles are used, leading to transmission failures.
Innovation Solution
The PIC structure incorporates supplemental waveguides positioned laterally adjacent to the primary waveguides, with distal portions extending beyond the primary waveguide ends, allowing for mode matching at multiple locations and creating multiple signal paths to reduce light signal power density and prevent power-induced damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If waveguides with different refractive index profiles are used for optical signal transmission, then device functionality and signal routing flexibility are improved, but power-induced damage occurs at high optical power levels
Solution Approach 1:
The invention introduces supplemental waveguides that segment the optical coupling path into multiple parallel channels. Instead of relying on a single direct coupling interface between primary waveguides, the optical signal is distributed through multiple supplemental waveguide paths, reducing the power density at any single location and preventing power-induced damage while maintaining signal routing flexibility
Solution Approach 2:
The supplemental waveguides act as intermediary elements between the primary waveguides. Rather than allowing direct high-power optical coupling between primary waveguides with different refractive index profiles (which causes damage), the supplemental waveguides serve as intermediate coupling paths that distribute and reduce the optical power density, enabling safe high-power signal transmission
2Device complexity
If direct waveguide coupling is used for optical signal transmission, then device complexity is reduced, but transmission reliability fails at high optical power levels
Solution Approach 1:
The invention segments the coupling path by introducing supplemental waveguides that create multiple parallel optical transmission channels. This segmentation distributes the optical power across multiple paths, preventing power-induced damage and improving transmission reliability at high power levels, while the segmented structure remains integrated within the PIC device
Solution Approach 2:
The invention merges multiple waveguide paths (primary and supplemental) into a unified coupling system. The supplemental waveguides are laterally adjacent to and extend beyond the primary waveguide ends, creating an integrated multi-path coupling structure that combines the simplicity of direct coupling with the reliability of distributed power handling
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 effectively facilitates the transmission of high-power optical signals between primary waveguides without causing power-induced defects, ensuring robustness and reliability in PICs by distributing signal power across multiple paths.
Implementation Method 1
mode matching occurs (i.e., where the propagation constant of optical mode inside the two waveguides becomes the same)
Implementation Method 2
optical signals can pass between the waveguides around a location, along the adjacent end portions, where mode matching occurs
Data Source
AI summary
Disclosed is a photonic integrated circuit (PIC) structure including: a first primary waveguide, which has a first main body and a first end portion that is tapered; at least one supplemental waveguide positioned laterally adjacent to and extending beyond the first end portion of the first primary waveguide; and a second primary waveguide, which has a second main body and a second end portion that at least partially underlays/overlays the first end portion of the first primary waveguide and the supplemental waveguide(s). The arrangement the end portions of the primary waveguides and the supplemental waveguide(s) allows for mode matching conditions to be met at multiple locations at the interface between the primary waveguides, thereby creating multiple signal paths between the primary waveguides and effectively reducing the light signal power density in any one path to prevent or at least minimize any power-induced damage.