2D Fiber Array Alignment Using Perimeter Surfaces

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Solution Overview

Problem

There is a need for multi-fiber connectors that can connect a larger number of fibers at a higher spatial density than conventional connectors, and methods for fabricating and using these higher density multi-fiber connectors.

Innovation Solution

The development of fiber optic cable assemblies featuring two-dimensional arrays of stripped optical fibers, where the perimeter external surfaces of the 2D fiber arrays are used as datum surfaces for alignment structures, enabling the use of alignment pins, precision glass tubes, and other structures for precise connector mating without conventional ferrules.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If conventional ferrule-based multi-fiber connectors are used, then fiber alignment and connection are achieved, but spatial density and bandwidth per unit area are limited

Engineering Contradiction:

Improvenumber of fiber connections per unit areaVSAvoidconnector size

Core Design Contradiction:

Quantity of substanceVSArea of stationary object

Solution Approach 1:

The patent transitions from conventional one-dimensional linear arrays of optical fibers to two-dimensional arrays, allowing significantly more fibers to be packed into a smaller connector footprint. This dimensional change enables higher spatial density of fiber connections without proportionally increasing connector size

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent employs nested structures where multiple layers of optical fibers are stacked vertically within the connector, with each layer containing a one-dimensional array. These layers are positioned at different heights (Z-axis) and laterally offset from one another, creating a compact three-dimensional arrangement that maximizes fiber density within the connector volume

Inventive Principle:

Principle #7Nested doll (Nesting)

2Productivity

If higher density fiber arrays are implemented, then bandwidth density increases, but manufacturing complexity and precision requirements increase

Engineering Contradiction:

Improvebandwidth densityVSAvoidfiber alignment precision

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent incorporates preliminary alignment features directly into the fiber array structure itself, such as peripheral fibers positioned at known locations and involution features formed during the fiber stacking process. These pre-built alignment references enable subsequent alignment operations to be performed with standard precision equipment, rather than requiring ultra-precision manufacturing of the entire array

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent employs asymmetric positioning of peripheral fibers and involution features at specific locations around the fiber array perimeter. This asymmetric arrangement creates unique mechanical engagement points that guide alignment during connector assembly, reducing the need for high-precision manufacturing throughout the entire structure by concentrating alignment functionality at specific asymmetric locations

Inventive Principle:

Principle #4Asymmetry

3Device complexity

If two-dimensional fiber arrays without conventional ferrules are used, then connector complexity is reduced, but alignment structure integration becomes more challenging

Engineering Contradiction:

Improveconnector structure complexityVSAvoidalignment structure integration

Core Design Contradiction:

Device complexityVSEase of manufacture

Solution Approach 1:

The patent merges the alignment structures directly with the fiber array assembly by integrating alignment pins, involution features, and peripheral fibers into the same structural framework. This consolidation eliminates separate alignment components and simplifies the overall connector structure, while the alignment features are created during the fiber stacking and bonding process itself

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent designs the fiber array structure to be self-aligning through its own geometric features, such as peripheral fibers positioned at precise locations and involution features formed by the stacking process. These self-generated alignment references enable the structure to guide its own assembly without requiring external alignment fixtures or complex tooling

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250180818A1Fiber optic cable assembly and fabrication method incorporating two-dimensional arrays of optical fibers

Publication Date: 2025.06.05 CORNING RES & DEV CORP

AI summary

Perimeter external surfaces of a 2D arrays of stripped optical fibers are used as datum surfaces for alignment structures for mating connectors in fiber optic cable assemblies. 2D fiber arrays may include involutions and/or protrusions to serve as mating locations for alignment structures and/or to serve as keying structures. A removable sleeve may be positioned around at least a portion of a 2D fiber array to align mating connectors and/or bias alignment structures toward one another. Fiber-free areas may be provided in an interior of a 2D fiber array to receive alignment structures. One or more compliant members may be configured to press first and second alignment structures toward one another proximate to a 2D fiber array. A cable assembly fabrication method includes forming window stripping and adhering optic fiber groups while preventing adhesive material from protruding beyond outermost surfaces of optical fibers at a perimeter of a fiber array. Multiple 2D fiber arrays with peripheral protective structures may be received in a connector sleeve and biased toward one another.