Fiber Optic Connector Ramps for Ferrule Rotational Alignment
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Solution Overview
Problem
Conventional techniques fail to address the precise and secure seating of fiber optic ferrules within strict rotational tolerance requirements, especially for angle polished ferrules, leading to misalignment and disruptions in optical connections.
Innovation Solution
A fiber optic connector design featuring a connector housing with ramps and a flange on the ferrule holder, which engages the ramps in multiple places to secure the ferrule in a final position, ensuring minimal rotational movement and precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional seating techniques are used, then the ferrule can be seated in the connector housing, but the rotational movement tolerance cannot be maintained within 1° for angle polished ferrules
Solution Approach 1:
The patent employs curved ramp surfaces instead of flat seating surfaces. The ramps have specific curvature radii (e.g., R1=0.5mm, R2=1.0mm) that guide the ferrule flange into precise rotational alignment as the ferrule is inserted. This curvature enables the flange to naturally follow the ramp contour, achieving sub-1° rotational tolerance for angle polished ferrules while maintaining a relatively simple seating structure.
Solution Approach 2:
The patent uses asymmetric ramp configurations where the ramps are positioned at specific angular offsets (e.g., 45° apart) and have different engagement characteristics on opposite sides of the ferrule flange. This asymmetry creates a unique mechanical keying effect that prevents rotational movement beyond the tolerated threshold, achieving precise angular positioning without requiring complex multi-component seating mechanisms.
2Ease of operation
If the ferrule is allowed to rotate freely during insertion, then insertion is easier, but misalignment occurs causing optical connection losses
Solution Approach 1:
The patent incorporates preliminary alignment features in the form of ramps that engage the ferrule flange before the ferrule reaches its final seating position. As the ferrule is inserted, the ramps gradually guide and constrain the flange's rotational movement, performing the alignment action in advance of final contact. This ensures the ferrule is pre-aligned to within 1° rotational tolerance before completing insertion, preventing misalignment and optical losses while maintaining smooth insertion operation.
Data Source
AI summary
A fiber optic connector housing has seating features in an internal opening that coordinate with a flange on a fiber optic ferrule to have a secure and precise position for the fiber optic ferrule. There are at least one pair of ramps that may be attached to an inner connector housing wall and an opening wall. The flange has contacts that engage the ramps, which direct the fiber optic ferrule in a rotational direction as well as a translational direction to a final position. The seating features also ensure the correct position after the fiber optic ferrule has been mated and unmated.