Grating Couplers with Perturbed Waveguides for Optical Signal Transmission
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Solution Overview
Problem
Conventional copper data channels face signal attenuation and crosstalk due to radiated electromagnetic energy, which are only modestly improved by existing techniques like equalization, coding, and shielding, and lack scalability.
Innovation Solution
The use of grating couplers with perturbed waveguides in semiconductor photonics, which vary in width along their length and include discrete scatterers, to enhance coupling efficiency and reduce mode-mismatch between optical fibers and grating couplers, enabling improved optical signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional copper data channels are used, then existing infrastructure can be maintained, but signal attenuation and crosstalk occur due to radiated electromagnetic energy
Solution Approach 1:
The patent replaces copper electrical channels with optical waveguide channels, substituting electromagnetic signal transmission through conductors with optical signal transmission through dielectric waveguides. This fundamental substitution eliminates the radiated electromagnetic energy problems inherent in copper channels, achieving superior signal quality and reduced attenuation.
Solution Approach 2:
The patent changes the transmission medium parameter from electrical conductor to optical waveguide, and changes the signal type from electrical to optical. This parameter change enables transmission over longer distances with lower attenuation and without the crosstalk issues of copper channels.
2Reliability
If equalization, coding, and shielding techniques are applied to copper channels, then signal quality improves modestly, but power consumption and system complexity increase considerably
Solution Approach 1:
The patent eliminates the need for complex equalization, coding, and shielding techniques by substituting copper channels with optical waveguides. The inherent properties of optical waveguides provide superior signal integrity without requiring additional complexity-mitigating technologies.
Solution Approach 2:
The patent converts the fundamental difference between electrical and optical transmission from a potential disadvantage into a benefit. The isolation properties of optical waveguides, which are physically distinct from electrical conductors, naturally prevent the radiated energy and crosstalk problems that would otherwise require complex mitigation techniques.
3Reliability
If equalization, coding, and shielding techniques are applied to copper channels, then signal quality improves modestly, but power consumption increases considerably
Solution Approach 1:
The patent replaces power-hungry electrical signal transmission through copper with optical signal transmission through waveguides. This substitution eliminates the need for power-intensive equalization, coding, and shielding techniques, achieving energy efficiency while maintaining superior signal quality.
4Productivity
If conventional grating couplers are used, then optical coupling can be achieved, but coupling efficiency is limited due to mode-mismatch between optical fibers and grating couplers
Solution Approach 1:
The patent applies local quality by introducing discrete scatterers at specific locations along the waveguide and varying the waveguide width locally. These localized modifications create controlled scattering that transforms the guided mode into a radiative mode better matched to the optical fiber, improving coupling efficiency and reducing optical losses.
Solution Approach 2:
The patent changes the waveguide geometry parameter by varying the width along the length of the waveguide. This parameter change, combined with the introduction of discrete scatterers, transforms the mode profile to achieve better matching with the optical fiber mode, thereby improving coupling efficiency.
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 approach significantly improves coupling efficiency by matching the optical mode to the fiber mode, reducing optical losses and enhancing scalability beyond conventional copper links.
Implementation Method 1
grating couplers incorporating perturbed waveguides... vary in width along their length and include discrete scatterers, to enhance coupling efficiency
Implementation Method 2
include discrete scatterers, to enhance coupling efficiency and reduce mode-mismatch between optical fibers and grating couplers
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
Methods and systems for grating couplers incorporating perturbed waveguides are disclosed and may include in a semiconductor photonics die, communicating optical signals into and/or out of the die utilizing a grating coupler on the die, where the grating coupler comprises perturbed waveguides. The perturbed waveguides may comprise a variable width along their length. The grating coupler may comprise a single polarization grating coupler comprising perturbed waveguides and a non-perturbed grating. The grating coupler may comprise a polarization splitting grating coupler (PSGC) that includes two sets of perturbed waveguides at a non-zero angle, or a plurality of non-linear rows of discrete shapes. The PSGC may comprise discrete scatterers at an intersection of the sets of perturbed waveguides. The grating couplers may be etched in a silicon layer on the semiconductor photonics die or deposited on the semiconductor photonics die. The grating coupler may comprise individual scatterers between the perturbed waveguides.