Common Etch Depth for Silicon Photonics Waveguides
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Solution Overview
Problem
Current optical communication networks face challenges in achieving high-density, low-latency, and low-power interchip and intrachip connections due to high optical loss and complex fabrication processes, which hinder the scaling of multilayer routing systems with silicon photonics.
Innovation Solution
The implementation of an optical device with a semiconductor layer using a common etch depth for a ring resonator, optical waveguide, and grating coupler, fabricated using a single etch operation, which enables compact, low-loss, and high-density optical links with reduced manufacturing costs and increased yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multi-step etching operations are used to create low-loss optical waveguides and low-power active devices, then optical loss is reduced and device performance is improved, but fabrication complexity increases and manufacturing yield decreases
Solution Approach 1:
The patent combines multiple etching operations into a single etching step that simultaneously defines the optical waveguide, ring resonator, and grating coupler with a common etch depth. This merging of operations reduces fabrication complexity and improves yield while maintaining the optical performance benefits of precisely controlled waveguide dimensions and mode confinement.
2Loss of energy
If a large optical mode is used to reduce optical scattering loss at the waveguide core-cladding boundary, then optical loss is reduced, but routing density decreases and device compactness is compromised
Solution Approach 1:
The patent applies local quality by creating a ridge waveguide structure where the etch depth is uniformly controlled but the lateral dimensions are optimized for compact routing. The single-etch process creates precise side walls that enable tight bends and high-density routing while maintaining sufficient mode confinement to keep scattering losses low, achieving both compactness and low loss through localized geometric optimization.
3Manufacturing precision
If conventional multi-step etching is used to create optical waveguides with precise dimensions, then manufacturing precision is improved, but additional optical loss is introduced at transition sections and yield is reduced
Solution Approach 1:
By combining the definition of optical waveguides, ring resonators, and grating couplers into a single etching operation with a common etch depth, the patent eliminates transition sections that would otherwise be created between separately etched components. This reduces optical transition loss while maintaining manufacturing precision through the uniformly controlled etching process that precisely defines all component dimensions in one step.
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 results in ultralow-loss optical waveguides with tight bends, enabling high-density routing and low-power consumption, while simplifying the fabrication process and reducing optical transition loss, thus facilitating efficient interchip and intrachip optical interconnects.
Implementation Method 1
a grating coupler...defined in the semiconductor layer using a common etch depth
Data Source
AI summary
An optical device is described. This optical device includes multiple components, such as a ring resonator, an optical waveguide and a grating coupler, having a common etch depth (which is associated with a single etch step or operation during fabrication). Moreover, these components may be implemented in a semiconductor layer in a silicon-on-insulator technology. By using a common etch depth, the optical device may provide: compact active devices, multimode ultralow-loss optical waveguides, high-speed ring resonator modulators with ultralow power consumption, and compact low-loss interlayer couplers for multilayer-routed optical links. Furthermore, the single etch step may help reduce or eliminate optical transition loss, and thus may facilitate high yield and low manufacturing costs.