Multicore Fiber Ferrule Flat-Side Alignment
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Solution Overview
Problem
High-density optical fiber connectors with single-core fibers are expensive to produce due to the need for precise control of the polishing process to ensure co-planarity, especially in configurations with a large number of fibers, and aligning multicore fibers with circular cross-sections presents challenges requiring expensive connectors or special alignment methods.
Innovation Solution
The development of a ferrule with a guide hole shaped to receive multicore fibers, featuring a flat side for rotational orientation alignment, and an alignment housing with inner reference surfaces and biasing means to ensure proper alignment of the fiber cores, along with a mating adapter for connecting these housings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If standard single-core fibers are used in high-density configurations, then the number of channels can be increased, but the production cost increases significantly due to the need for very precise control of the polishing process to ensure co-planarity
Solution Approach 1:
The patent changes the geometric parameter of the fiber from circular cross-section to flat-sided cross-section. This parameter change eliminates the need for complex polishing control while maintaining the ability to achieve precise alignment through the flat sides providing natural reference surfaces for rotational orientation.
Solution Approach 2:
The patent introduces asymmetry in the fiber cross-section by using flat sides instead of circular symmetry. The flat-sided geometry provides inherent alignment references that break rotational symmetry, allowing for precise core alignment without requiring expensive continuously tunable connectors or special alignment methods.
2Quantity of substance
If multicore fibers with circular cross sections are used, then the number of channels can be increased significantly, but alignment becomes challenging requiring relatively expensive connectors or special alignment methods
Solution Approach 1:
The patent employs flat-sided multicore fibers that break rotational symmetry. The flat sides serve as natural alignment references, eliminating the need for complex alignment methods or continuously tunable connectors. The asymmetric geometry provides inherent rotational orientation cues that simplify the connector design.
Solution Approach 2:
The flat-sided fiber geometry provides self-alignment capabilities through its inherent flat surfaces that naturally indicate rotational orientation. The fiber structure itself serves the alignment function that would otherwise require external alignment mechanisms or expensive connector components.
3Quantity of substance
If a 2D-array ferrule with many fibers is used, then high density is achieved, but the polishing process requires very precise control to ensure co-planarity
Solution Approach 1:
The patent changes the fiber cross-sectional parameter from circular to flat-sided geometry. This parameter change fundamentally alters the alignment requirement, transforming the problem from one requiring precise polishing control to one where flat surfaces provide natural reference planes for alignment.
Solution Approach 2:
The flat-sided fiber geometry provides a simple, cost-effective solution that eliminates the need for expensive precision polishing equipment and complex control systems. The inherent flat surfaces serve as disposable alignment references that are built into the fiber structure itself.
Data Source
AI summary
An optical fiber cable connector includes a ferrule with a guide hole that is shaped to closely receive a multicore fiber having a flat side indicative of the rotational orientation of the cores of the multicore fiber. The ferrule includes a flat surface at one side of the guide hole, corresponding in position to the flat side of the multicore fiber. Installing the multicore fiber into the guide hole with its flat side abutting the flat surface along the side of the guide hole provides alignment of the cores with respect to an optical component to which the multicore fiber endface is to be connected.