Cylindrical Ferrule Alignment Sleeve for Multi-Core Fiber Precision
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Solution Overview
Problem
Multi-core fiber optic connectors face challenges in precise alignment due to manufacturing tolerances and play between ferrule holders and plug housings, leading to potential misalignment of satellite cores, which can result in communication errors and increased costs from precision molding and potential abrasion issues.
Innovation Solution
A ferrule alignment sleeve with a tubular design and tabs for precise alignment, which can be snap-attached to an adapter housing without a boss, and includes security keying features to prevent unauthorized mating, reducing alignment errors to ±1.5 degrees or less and enhancing network security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional ferrule holder and plug housing design is used, then manufacturing cost is reduced, but alignment precision deteriorates due to play and manufacturing tolerances
Solution Approach 1:
The patent introduces a cylindrical optical ferrule alignment apparatus as an intermediary component between the ferrule holder and plug housing. This alignment apparatus includes alignment features such as cam surfaces and corresponding alignment surfaces that actively engage to maintain precise rotational alignment. The intermediary alignment apparatus eliminates the need for expensive precision molding of the ferrule holder and plug housing while ensuring accurate core alignment through mechanical engagement of its alignment features.
2Stability of the object's composition
If hexagonal flange and cavity design is used, then rotational positioning is enabled, but alignment stability deteriorates due to play between components
Solution Approach 1:
The patent employs dynamic alignment features including cam surfaces that actively engage with corresponding alignment surfaces. These features maintain continuous mechanical contact and alignment during insertion and operation, eliminating static play between components. The cam surface design allows for self-adjusting alignment that compensates for manufacturing tolerances while maintaining stable rotational positioning.
Solution Approach 2:
The alignment apparatus incorporates asymmetric alignment features such as non-circular cam surfaces and corresponding alignment surfaces that provide unique rotational positioning. The asymmetric geometry ensures that only one rotational orientation allows proper engagement of the alignment features, eliminating ambiguity and ensuring stable, repeatable alignment without requiring complex multi-feature mechanisms.
3Manufacturing precision
If precision molding is used to reduce play, then alignment precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent introduces a cylindrical optical ferrule alignment apparatus as an intermediary component between the ferrule holder and plug housing. This alignment apparatus includes alignment features such as cam surfaces and corresponding alignment surfaces that actively engage to maintain precise rotational alignment. The intermediary alignment apparatus eliminates the need for expensive precision molding of the ferrule holder and plug housing while ensuring accurate core alignment through mechanical engagement of its alignment features.
Solution Approach 2:
The alignment apparatus is designed as a separate, replaceable component that can be manufactured using standard molding techniques rather than requiring precision molding of the main connector components. This approach allows the alignment features to be produced cost-effectively as a dedicated alignment element that can be independently manufactured and replaced if needed, rather than requiring expensive precision molding of the entire ferrule holder or plug housing.
Data Source
AI summary
An alignment sleeve for an optical fiber adapter includes features to bring precision alignment between optical fiber cores. The sleeve includes a tubular inner area to accept first and second ferrule ends of first and second connectors. First and second tabs project from first and second ends of the sleeve. The first and second tabs slide into holes in the ferrule holders or barrels of the first and second connectors, so as to provide rotational alignment of the first and second ferrules, which may be presenting multi-core optical fibers. A mid-portion of the sleeve may include geometrical features to enable a snap fit of the sleeve into a housing of the adapter. More than one tab may be employed at the ends of the sleeve, and the tabs may have defined spacing and/or dimensions to enable security keying, only permitting coupling between connectors possessing matching holes in the ferrule barrels.