Fiber Array Unit Alignment Features for High-Density PIC Shorelines
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Solution Overview
Problem
Existing passive alignment techniques for coupling optical fibers with photonic integrated circuits (PICs) face challenges in precisely aligning a large number of fibers, particularly due to the use of V-grooves which compromise mechanical strength and structural integrity, and result in reduced fiber shoreline density.
Innovation Solution
The implementation of optical fiber housings with passive alignment mechanisms outside the light coupling region, utilizing high-precision metal stamping or glass molding to create V- or U-grooves, and incorporating micro-lens arrays or alignment features to enhance fiber positioning and alignment, allowing for increased fiber count and density without compromising mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If V-grooves are used for passive alignment of optical fibers with PIC waveguides, then alignment precision is achieved, but mechanical strength and structural integrity are compromised
Solution Approach 1:
The alignment function is segmented from the structural support function. V-grooves are placed only in the fiber array unit housing rather than extending through the entire PIC substrate. This allows the housing to provide alignment precision while the PIC substrate maintains its full mechanical strength and structural integrity.
Solution Approach 2:
The fiber array unit housing acts as an intermediary component between the PIC substrate and the optical fibers. It provides the V-grooves for alignment while being separate from the PIC substrate, thus not compromising the substrate's mechanical properties.
2Measurement precision
If V-grooves are used for passive alignment, then fiber positioning is enabled, but fiber shoreline density is reduced
Solution Approach 1:
The alignment features are positioned in a different dimensional location (in the housing rather than on the PIC shoreline). This allows fibers to be densely packed along the PIC shoreline while the housing provides the necessary alignment guidance from a separate spatial location.
3Quantity of substance
If a large number of optical fibers are held in a FAU, then data transfer capacity is increased, but alignment precision becomes more difficult to achieve
Solution Approach 1:
The alignment function is segmented into discrete V-groove features distributed throughout the housing rather than requiring a single complex alignment mechanism. This segmentation allows each groove to independently guide its corresponding fiber, maintaining precision even as the total number of fibers increases.
Data Source
AI summary
An optical fiber housing comprises a first face, a second face opposite the first face, a first side, and a second side opposite the first side. The first face is spaced apart from the second face by a first distance. A plurality of optical fibers extends in a longitudinal direction between the first and second faces, and are laterally spaced apart across a transverse width of the first face between the first side and the second side. Each optical fiber comprises a diameter. A surface of the housing is orthogonal to the first face and the first side. A plurality of alignment features is on the surface stand off from a remainder of the surface by a height greater than the diameter. The alignment features extend a second distance in the longitudinal direction that is less than the first distance, and comprises a curved or V-shaped peripheral surface.