Pre-assembled Multi-fiber Connector for Microduct Installation
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Solution Overview
Problem
The challenge in fiber optic network installations is the high cost and time required for on-site termination of multi-fiber cables due to stringent mechanical tolerances, which often necessitate skilled technicians and large connector sizes that cannot fit through microducts, leading to increased labor and installation complexities.
Innovation Solution
A terminal assembly for multi-fiber optical cables with pre-installed ferrules and a protective enclosure, allowing for partial assembly and reduced connector size to fit through microducts, with a plug-and-play approach for easy installation, featuring a back-post assembly and separate connector housing for final assembly on-site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pre-assembled multi-fiber connectors are used, then alignment precision and manufacturing quality are improved, but the connector size becomes too large to fit through microducts
Solution Approach 1:
The multi-fiber connector is divided into separate components: individual ferrules with fibers are pre-assembled and pre-aligned, then these smaller modular units are inserted into a housing on-site. This segmentation allows the precision-aligned ferrules to be transported separately through microducts and then assembled into the final connector configuration.
Solution Approach 2:
The ferrules and fibers are pre-assembled and pre-aligned in a controlled manufacturing environment where precision alignment can be achieved. This preliminary action of aligning the fibers before field installation ensures that the critical alignment work is done when conditions are optimal, rather than attempting to align multiple fibers simultaneously in the field.
2Adaptability or versatility
If on-site termination of multi-fiber cables is performed, then adaptability to different installation scenarios is improved, but labor cost and installation time increase due to skilled technician requirements
Solution Approach 1:
The complex tasks of fiber alignment, ferrule assembly, and precision positioning are performed in advance during manufacturing. This preliminary preparation transforms the complex multi-step on-site termination process into a simpler installation procedure where pre-assembled ferrules are merely inserted into a housing, dramatically reducing both time and skill requirements.
Solution Approach 2:
The pre-assembled ferrule units serve as intermediaries that bridge the gap between manufacturing precision and field installability. These pre-prepared components encapsulate the complexity of alignment and positioning, allowing field technicians to perform simple insertion operations rather than complex alignment procedures.
3Reliability
If fully assembled connectors are used, then connection stability and protection are improved, but the connector cannot be pushed or pulled through microducts
Solution Approach 1:
The connector system is segmented into transportable ferrule units and a housing component. The ferrules with pre-installed fibers are small enough to be pushed or pulled through microducts, while the larger housing remains at the termination point. This segmentation resolves the contradiction between needing protection/stability and being able to navigate tight spaces.
Solution Approach 2:
The ferrules are nested within the housing structure during final assembly. The pre-assembled ferrules fit into the housing which provides the protective enclosure and structural stability. This nested arrangement allows the small ferrules to be transported through microducts while the complete assembled structure provides the necessary protection and connection stability.
Data Source
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AI summary
Multi-fiber, fiber optic cable assemblies may be configured so that the terminal ends of the cables have pre-assembled back-post assemblies that include pre-assembled ferrules, such as MPO ferrules that meet the requisite tolerances needed for fiber optic transmissions. To protect the pre-assembled components from damage prior to and during installation, pre-assembled components may be enclosed within a protective housing. The housing with pre-assembled components may be of a size smaller than fully assembled connectors so as to be sized to fit through a conduit. The remaining connector housing components for the multi-fiber connectors may be provided separately and may be configured to be attached to the back-post assembly after installation of the cable.