Glass Recirculatory Layer for Optical Signal Rerouting
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Solution Overview
Problem
Silicon photonics packaging faces challenges in fiber coupling compatibility and integration with electronic integrated circuits due to mode field diameter mismatches and tight alignment tolerances, leading to signal loss and routing issues as the size of silicon photonic arrays increase.
Innovation Solution
A glass recirculatory layer with waveguides is used to route optical signals, formed using techniques like laser direct writing, which reduces signal loss by allowing controlled z-height formation and minimizing waveguide intersections, and can be attached to photonic integrated circuits to facilitate efficient signal routing between PICs and EICs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional silicon photonics packaging is used, then integration with electronic integrated circuits is achieved, but mode field diameter mismatches and tight alignment tolerances cause signal loss
Solution Approach 1:
The patent introduces a glass recirculatory layer with waveguides as an intermediary component between the silicon photonic array and external fiber connectors. This glass layer acts as a mediator that bridges the mode field diameter mismatch between silicon waveguides and optical fibers, enabling efficient signal coupling while maintaining tight alignment tolerances throughout the packaging system.
Solution Approach 2:
The patent employs a three-dimensional recirculatory routing architecture where the glass recirculatory layer is positioned above the silicon photonic array in the vertical dimension. This dimensional separation allows independent optimization of the silicon photonic circuit layer and the optical coupling layer, resolving the mode field diameter mismatch by providing a transition interface at a different spatial level.
2Productivity
If silicon photonic arrays are scaled up in size, then more optical signals need to be routed, but routing complexity and signal loss increase
Solution Approach 1:
The patent utilizes a three-dimensional recirculatory routing architecture where the glass recirculatory layer is positioned above the silicon photonic array. This vertical separation enables complex routing paths to be achieved through the third dimension (z-height) rather than requiring increasingly complex planar routing, thus maintaining routing scalability as array sizes increase.
Solution Approach 2:
The patent divides the routing function into separate components: the silicon photonic array generates optical signals, the glass recirculatory layer provides dedicated waveguide pathways for signal routing, and fiber connectors provide external interfaces. This segmentation allows each component to be optimized independently, reducing overall routing complexity while increasing routing capacity.
3Loss of energy
If waveguide intersections are minimized in glass recirculatory layer, then signal loss is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent employs laser direct writing to form waveguides in the glass recirculatory layer, utilizing precise control of laser parameters (power, speed, focal position) to create waveguides at controlled z-heights. By adjusting these parameters, the manufacturing process can optimize waveguide paths to minimize intersections while maintaining ease of fabrication through a single-step direct writing process.
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
The glass recirculatory layer effectively reduces signal loss and increases routing density by avoiding waveguide intersections, enabling efficient optical signal transmission across larger silicon photonic arrays while maintaining low cost and compatibility with existing technologies.
Implementation Method 1
a glass recirculatory layer comprising one or more waveguides configured to route one or more optical signals from the photonic integrated circuit die
Implementation Method 2
formed using techniques like laser direct writing
Implementation Method 3
formed using techniques like laser direct writing, which reduces signal loss by allowing controlled z-height formation
Data Source
AI summary
Various embodiments disclosed relate to routing optical signals from silicon photonics, such as a photonic integrated circuit. The present disclosure includes a glass recirculatory layer with waveguides at varying heights to allow re-routing of such optical signals from silicon photonics, such as a photonic integrated circuit. Re-routing of optical signals can be accomplished in the glass recirculatory layer with reduced losses due to reduced intersections of waveguides therein.