Discrete Optical Guards for PIC Stray Light Absorption
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Solution Overview
Problem
Stray optical signals in photonic integrated circuits (PICs) create background noise, affecting the operation of unintended photonic components like photodetectors.
Innovation Solution
Incorporation of discrete optical guard elements made of light-absorbing materials, such as silicon and germanium, surrounding photonic components to absorb stray optical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If discrete optical guard elements are added to absorb stray optical signals, then optical noise is reduced, but device complexity increases
Solution Approach 1:
The optical guard structure is divided into multiple discrete optical guard elements rather than using a single continuous guard structure. Each element is positioned at specific locations around the photonic component to absorb stray optical signals from different directions, effectively reducing optical noise while maintaining manageable device complexity
Solution Approach 2:
Discrete optical guard elements are introduced as intermediary structures between the photonic component and the surrounding environment. These elements act as mediators that absorb and redirect stray optical signals before they can reach unintended photonic components, thereby reducing optical noise without directly modifying the core photonic component
2Manufacturing precision
If discrete optical guard elements are added to absorb stray optical signals, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The optical guard structure is segmented into multiple discrete elements that can be positioned at specific locations around the photonic component. This segmentation allows for precise control of stray light absorption from different directions while keeping each individual element simple to manufacture
Solution Approach 2:
The discrete optical guard elements are integrated with existing semiconductor fabrication processes and structures. The guard elements are combined with the photonic component manufacturing flow, utilizing the same substrate and fabrication techniques, which improves manufacturing precision without proportionally increasing device complexity
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
Reduces optical noise and improves the performance of functional components by minimizing dark current and scattering loss without requiring additional process steps or layers.
Implementation Method 1
each of the plurality of discrete optical guard elements including a light absorbing material
Data Source
AI summary
The disclosure relates to a PIC structure including a photonic component on a semiconductor substrate. The photonic component includes an optical absorber including a spiral waveguide body and a linear input waveguide coupled to the spiral waveguide body. A plurality of discrete optical guard elements are in proximity to the photonic component. The plurality of discrete optical guard elements are composed of a light absorbing material and surround the spiral waveguide body and the linear input waveguide.