Segmented MPO Ferrule Assembly for Narrow Duct Installation
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Solution Overview
Problem
Conventional MPO connectors are too large to be pushed through ducts with an inside diameter of less than 10mm, posing a challenge in fiber optic cable distribution.
Innovation Solution
A ferrule assembly for MPO connectors that can be pushed through ducts with diameters as small as 5.5mm, featuring a spring-biased ferrule and crimp sleeve design, allowing for field termination and coupling with a housing after insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional MPO connector design is used, then connection reliability is maintained, but the connector size is too large to pass through narrow ducts
Solution Approach 1:
The connector is divided into two separate components: a ferrule assembly that can be pushed through narrow ducts, and a housing that remains at the termination point. This segmentation allows the critical ferrule portion to have minimal dimensions for duct passage while the housing provides the necessary structural support and alignment features.
Solution Approach 2:
A thin-walled tube or duct is introduced as an intermediary component that guides the ferrule assembly through narrow passages and into the housing. This intermediary facilitates the insertion process by providing a pathway that the ferrule can traverse while protecting the fibers during installation.
2Adaptability or versatility
If ferrule assembly is pushed through narrow ducts, then installation flexibility is improved, but field coupling with housing becomes more complex
Solution Approach 1:
The ferrule assembly is designed with self-aligning features including positioning protrusions that automatically engage with corresponding recesses in the housing. The spring mechanism provides automatic engagement force, allowing the components to self-assemble without requiring complex alignment procedures or specialized tools during field installation.
Solution Approach 2:
The ferrule assembly is pre-terminated with fibers in a controlled environment before being pushed through the duct. This preliminary termination ensures proper fiber alignment and protection is established before the challenging duct passage, simplifying the field installation process to merely connecting the pre-prepared ferrule to the housing.
3Reliability
If ferrule is spring-biased, then connection reliability is improved, but the assembly becomes harder to push through narrow ducts
Solution Approach 1:
The spring mechanism is designed to provide progressive engagement force rather than constant resistance. As the ferrule assembly is pushed through the duct and into the housing, the spring gradually compresses and engages, providing increasing holding force only when the components are properly positioned, rather than resisting the entire insertion motion.
Solution Approach 2:
The spring bias is applied locally at the engagement interface between the ferrule assembly and housing, rather than throughout the entire ferrule structure. This localized spring application provides reliable connection force only where needed for mating, while the rest of the ferrule remains flexible and easy to push through narrow ducts.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the termination and connection of multiple fiber cables through narrow ducts, facilitating efficient installation and reducing hardware and space requirements in high-density interconnect environments.
Implementation Method 1
a spring disposed at the rearward end of the ferrule assembly and configured to bias the ferrule and crimp sleeve forwardly
Data Source
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AI summary
A fiber optic connector includes a ferrule, a ferrule adapter configured to be coupled with the ferrule, and a retention body configured to be coupled with a multi-fiber cable. The ferrule is configured to terminate a plurality of fibers of a multi-fiber cable and is configured with a cross-sectional profile smaller than a ferrule of a multi-fiber push on (MPO) connector such that the ferrule is configured to be pushed through a duct having an inside diameter smaller than a cross-sectional profile of the ferrule of the MPO connector. The ferrule adapter and the ferrule cooperate to define a ferrule interface configured to mate with ferrule of the MPO connector. The ferrule is configured to include external channels at opposing laterals sides of the ferrule. The ferrule adapter is configured to include channels that oppose the external channels of the ferrule. The channels of the ferrule adapter and the external channels of the ferrule are configured to cooperate to define a pair of bores configured to receive a pair of external pins. The bores are configured to receive a pair of pins from the mating MPO connector.