Vertically Curved Waveguide Coupler for Low-Loss Optical Interconnects
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Solution Overview
Problem
Existing integrated photonic devices face challenges in efficiently coupling optical signals to and from optical waveguide structures within the device, leading to significant power loss due to sharp bends in optical waveguides, which cause signal leakage.
Innovation Solution
A vertical bend optical waveguide coupler is embedded within the electrical interconnection region of the semiconductor device, featuring a stacked staircase-shaped metal structure that gradually curves from a vertical to a horizontal orientation, minimizing bend loss by using a refractive index difference between a polycrystalline silicon fill and metal structures to guide optical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If fiber waveguides are attached through the package to the semiconductor device, then optical signals can be coupled to the device, but significant power loss occurs due to sharp bends in optical waveguides
Solution Approach 1:
The patent transitions from planar waveguide coupling to three-dimensional vertical coupling by embedding the optical coupler within the electrical interconnection region of the semiconductor device. This vertical integration eliminates the need for sharp bends in traditional planar waveguides, reducing optical power loss while achieving compact packaging.
Solution Approach 2:
The optical coupler is nested within the electrical interconnection region of the semiconductor device, combining optical and electrical interconnection functions in a single integrated structure. This nesting approach eliminates separate coupling structures and reduces overall device complexity.
2Loss of energy
If a vertical bend optical waveguide coupler is embedded within the electrical interconnection region, then optical power loss is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent merges the formation of electrical interconnection structures with optical waveguide formation by using the same metal structures and dielectric layers for both purposes. The optical coupler is formed using existing fabrication processes, eliminating the need for separate manufacturing steps and simplifying production.
Solution Approach 2:
The metal structures and dielectric layers serve dual functions: electrical interconnection and optical waveguide formation. This multi-functionality reduces the number of separate components and processes needed, making manufacturing easier while achieving vertical optical coupling.
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 solution effectively reduces optical power loss by minimizing signal leakage at bends, enhancing the efficiency of optical signal transfer between external waveguides and internal waveguide structures within the integrated photonic device.
Implementation Method 1
The first and the second metal structure and the fill material have a refractive index difference that substantially confines propagating optical signals within the bounded fill region along a substantially curved optical path
Data Source
AI summary
An optical waveguide structure may include an optical waveguide structure located within a semiconductor structure and an optical coupler. The optical coupler may include a metallic structure located within an electrical interconnection region of the semiconductor structure, whereby the metallic structure extends downward in a substantially curved shape from a top surface of the electrical interconnection region and couples to the optical waveguide structure. The optical coupler may further include an optical signal guiding region bounded within the metallic structure, whereby the optical coupler receives an optical signal from the top surface and couples the optical signal to the optical waveguide structure such that the optical signal propagation is substantially vertical at the top surface and substantially horizontal at the optical waveguide structure.