Photonic Wire Bond 3D Structuring for High-Density Optical Interconnects
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Solution Overview
Problem
Current methods for connecting lateral single-mode planar integrated photonic systems to each other or to glass fibers face challenges due to high precision requirements, low integration density, and high packaging costs, with existing technologies unable to efficiently achieve low-loss optical connections and scalable production.
Innovation Solution
The development of photonic wire bonds (PWBs) with three-dimensionally structured optical waveguides that can be freely designed, allowing for high integration densities and economic production, using a method that involves mounting waveguides on a component carrier, embedding them in resist material, detecting positions, determining favorable geometries, and structuring them using direct-writing lithography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard single-mode fibers are used for connecting integrated photonic systems, then optical connection is achieved, but integration density is low and packaging costs are high
Solution Approach 1:
The patent transitions from planar 2D waveguide connections to 3D photonic wire bonds that extend in the vertical dimension. The wire bonds are embedded in a substrate and can route optical signals through three-dimensional space, enabling higher integration density by stacking multiple connection layers and reducing the need for manual fiber alignment while maintaining low-loss optical connections
2Reliability
If manual fiber alignment and attachment methods are used, then optical connection is achieved, but packaging costs increase significantly
Solution Approach 1:
The patent implements self-aligned waveguide structures where the photonic wire bonds are automatically positioned relative to the integrated photonic circuits through embedded positioning features. The bonds are pre-configured in the substrate with alignment markers that guide automated placement, eliminating manual alignment steps and reducing packaging costs while maintaining connection quality
Solution Approach 2:
The patent performs preliminary structuring of the photonic wire bonds during substrate fabrication before final assembly. The waveguide paths are pre-defined and pre-positioned in the substrate, allowing automated attachment of integrated photonic circuits without requiring complex real-time alignment procedures, thereby reducing manufacturing complexity and cost
3Ease of operation
If passive positioning methods are used for connecting optical components, then connection is achieved, but precision requirements cannot be met for lateral single-mode waveguides
Solution Approach 1:
The patent introduces an intermediary alignment layer with embedded positioning markers and alignment features between the photonic wire bonds and the integrated photonic circuits. This intermediary structure provides mechanical reference points that enable automated systems to achieve sub-micron positioning precision without complex active feedback control, bridging the gap between simple passive positioning and high-precision requirements
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 enables low-loss optical connections with insertion losses below 2 dB over a wide optical bandwidth, achieving high integration densities and efficient production of photonic wire bonds with precise positioning and high index contrast, overcoming the limitations of previous methods.
Implementation Method 1
detecting positions of the optical waveguides to be connected with reference to a coordinate system using a measuring system
Implementation Method 2
detecting positions of the optical waveguides to be connected with reference to a coordinate system using a measuring system
Implementation Method 3
three-dimensional structuring of the optical waveguide geometries in the volume of the resist material using a direct-writing lithography device
Data Source
AI summary
A method for making optical connections with optical waveguides includes mounting the optical waveguides or a device comprising the optical waveguides, on a component carrier. A partial region of the optical waveguides is embedded in a volume of resist material. Positions of the optical waveguides to be connected are detected with reference to a coordinate system using a measuring system. Favorable, three-dimensional geometries are determined for optical waveguide structures for connecting the optical waveguides to each other at predetermined connecting locations and the optical waveguide structure geometries are converted to a machine-readable dataset. The optical waveguide geometries in the volume of the resist material are three-dimensionally structured using a direct-writing lithography device operating on the basis of the machine-readable dataset. The structured resist material is treated using physical or chemical methods to form at least one optical waveguide structure having ends connected to predetermined connecting locations of the optical waveguides.