Fiber Array Offset Layout for Warped Edge Coupler Alignment
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Solution Overview
Problem
The alignment of optical fibers with edge couplers in optical packages is compromised due to warping during the bonding process, leading to misalignment and potential performance issues.
Innovation Solution
The optical fibers are arranged in offset groups to accommodate warpage, ensuring alignment with edge couplers despite manufacturing defects, using a fiber array unit to manage the misalignment caused by warpage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If optical fibers are aligned with edge couplers before bonding, then alignment precision is improved, but warpage during bonding process degrades this alignment
Solution Approach 1:
The patent applies preliminary action by pre-aligning optical fibers with edge couplers before the bonding process, establishing the correct alignment relationship in advance. This allows the alignment to be set prior to warpage occurrence, and the design accommodates subsequent warpage through the offset grouping mechanism.
Solution Approach 2:
The patent applies local quality by creating offset groups where fibers in different groups have different alignment offsets relative to the edge couplers. This local variation in offset compensates for different warpage magnitudes and directions across the fiber array, allowing each local region to accommodate warpage optimally.
2Ease of manufacture
If fibers are arranged in a straight line, then manufacturing simplicity is improved, but warpage causes misalignment and signal loss
Solution Approach 1:
The patent applies segmentation by dividing the fiber array into multiple offset groups rather than treating all fibers uniformly. Each group has a specific offset from the edge couplers, allowing the system to handle warpage effects that would be problematic in a single straight-line arrangement.
Solution Approach 2:
The patent applies asymmetry by introducing intentional offset differences between fiber groups, breaking the symmetric straight-line arrangement. This asymmetric configuration compensates for warpage-induced misalignment, ensuring reliable optical coupling despite the bonding process warpage.
3Reliability
If offset groups are introduced to compensate for warpage, then alignment reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by varying the offset distance parameter across different fiber groups. By adjusting this geometric parameter, the system compensates for warpage effects without requiring complex active control mechanisms, maintaining relatively simple device architecture while improving alignment reliability.
Data Source
AI summary
Optical devices and methods of manufacture are presented in which a fiber array unit is utilized to arrange optical fibers so that, once the fiber array unit is attached to an optical device such as a first optical package, the optical fibers are better aligned with edge couplers within the first optical package after the edge couplers have been warped out of a straight alignment.