Optical Coupling Attachment Using Mechanical Features for Thermal Cycling
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Solution Overview
Problem
Existing optical coupling devices in high-speed interconnects lack self-alignment features and mechanical connections, leading to compromised connections due to temperature cycling and socketing, which stress the adhesive bond between the optical coupling device and photonic integrated circuits.
Innovation Solution
Incorporation of coupling features that mechanically connect the optical coupling device to the photonic integrated circuit, package substrate, and integrated heat spreader, using adhesive or solder, to enhance alignment and stability, addressing thermal expansion differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive bonding is used to attach the optical coupling device to the photonic integrated circuit, then the device can be assembled, but the connection is compromised under temperature cycling and socketing stress
Solution Approach 1:
The patent introduces coupling features that segment the bonding function into two parts: mechanical interlocking through geometric features (lips, grooves, protrusions) and adhesive bonding. This segmentation allows the mechanical features to handle stress from temperature cycling and socketing, while the adhesive provides baseline bonding, resolving the contradiction between assembly feasibility and connection reliability under stress.
Solution Approach 2:
The patent employs a composite attachment system combining mechanical coupling features (rigid structural elements) with adhesive material (flexible bonding agent). This composite approach creates a hybrid connection that leverages the strength and rigidity of mechanical features while maintaining the stress-distribution advantages of adhesive bonding, thereby improving both bond strength and connection reliability under thermal and mechanical stress.
2Manufacturing precision
If mechanical coupling features are added to provide self-alignment and structural support, then alignment and connection strength improve, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the coupling features: self-alignment, mechanical support, and stress resistance are all integrated into single geometric structures (such as lips with grooves or protrusions). By combining these functions into unified features rather than separate components, the patent achieves improved alignment precision and connection strength without proportionally increasing device complexity.
Solution Approach 2:
The coupling features are designed to provide self-alignment capabilities, where the geometric structures (complementary shapes, interlocking profiles) automatically guide and position the optical coupling device relative to the photonic integrated circuit during assembly. This self-service alignment mechanism eliminates the need for external alignment tools or complex positioning systems, improving manufacturing precision while controlling 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
The solution provides a stronger bond with improved shear and tensile strength, alleviates alignment issues, and protects the connection from thermodynamic disruptions, ensuring reliable communication in high-speed optical interconnects.
Implementation Method 1
using adhesive or solder, to enhance alignment and stability
Implementation Method 2
using adhesive or solder, to enhance alignment and stability
Implementation Method 3
addressing thermal expansion differences
Data Source
AI summary
An apparatus comprising a die comprising a photonic integrated circuit, the die comprising a first plurality of optical channels; an optical coupling device, the optical coupling device comprising a second plurality of optical channels aligned with the first plurality of optical channels; and a coupler attached to the optical coupling device and to at least one of the die and a package substrate attached to the die.