Fiber Optic Connector Flattened Regions for Rotation Control

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Solution Overview

Problem

Conventional optical fiber LC connectors allow for rotation between the fiber and the connector when pushed through a duct, potentially causing damage and signal degradation.

Innovation Solution

A fiber optic connector sub-assembly with a ferrule holder, retaining tube, and connecting tube, featuring flattened regions to prevent relative rotation, and an outer housing for LC-style push/pull engagement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional LC connectors are used to allow limited movement during pushing through ducts, then ease of operation is improved, but rotation between fiber and connector occurs causing damage and signal loss

Engineering Contradiction:

Improvemovement capability during duct installationVSAvoidsignal integrity and fiber protection

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The connector incorporates asymmetric flattened regions on the connecting tube and corresponding flattened inner regions on the retaining tube. These asymmetric features prevent rotation by creating a unique orientation that cannot be rotated without mechanical interference, thus protecting the fiber while maintaining pushability through ducts.

Inventive Principle:

Principle #4Asymmetry

2Productivity

If single mode fiber is pre-terminated with connectors for field deployment, then productivity is improved, but rotation during installation causes signal degradation

Engineering Contradiction:

Improvefield termination efficiencyVSAvoidsignal quality

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The asymmetric flattened regions are integrated into the pre-terminated connector design, allowing field deployment to proceed quickly while the anti-rotation features ensure signal quality is maintained during installation through ducts and conduits.

Inventive Principle:

Principle #4Asymmetry

3Ease of operation

If the connector allows rotation during pushing through ducts, then ease of operation is improved, but harmful effects occur to the fiber

Engineering Contradiction:

Improveinstallation flexibilityVSAvoidfiber damage and signal loss

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The flattened regions create an asymmetric mechanical interface that eliminates rotation during installation. The connector can still be pushed through ducts with ease, but the asymmetric features ensure the fiber cannot rotate into harmful positions that would cause damage or signal loss.

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS12411288B2Fiber optic connector having flattened regions that face and align to prevent rotation

Publication Date: 2025.09.09 PPC BROADBAND FIBER LTD

AI summary

An optical fiber connector sub-assembly for an optical fiber connector includes a ferrule configured to hold an optical fiber therein, a ferrule holder configured to hold the ferrule, a retaining tube configured to hold the ferrule holder and receive a fiber optic cable, and a connecting tube configured to be rotatingly coupled with the ferrule holder and slidingly received by the retaining tube. The ferrule holder, the retaining tube, and the connecting tube are configured to receive an optical fiber, and the retaining tube and the connecting tube are configured to cooperate with one another to prevent relative rotation between the ferrule holder and the retaining tube.