Optical Fiber Fan-Out Assembly for Variable-Pitch Mass Fusion Splicing
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Solution Overview
Problem
Conventional optical fiber fan-out assemblies and cable assemblies face inefficiencies in fiber termination and splicing processes, particularly due to the time-consuming nature of single-fiber fusion splicing and the reliance on costly materials like polytetrafluoroethylene for furcation tubes, which limits scalability and increases labor and material costs.
Innovation Solution
An optical fiber fan-out assembly with a variable pitch transition segment encapsulated in polymeric material, allowing for mass fusion splicing and eliminating the need for separate housings or strength members, enabling fully automated production and enhanced flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-fiber fusion splicing is used for fiber termination, then each fiber can be spliced individually with good reliability, but the process becomes time-consuming and labor-intensive
Solution Approach 1:
The patent combines multiple individual fiber splicing operations into a single mass fusion splicing operation. The fan-out assembly maintains all fibers in a bundled, organized state through the splicing process, allowing all fibers to be spliced simultaneously to a ribbon cable rather than one at a time, thereby dramatically reducing splicing time while maintaining reliability
Solution Approach 2:
The fan-out assembly performs preliminary organization and alignment of fibers before the splicing operation. By pre-arranging fibers in a systematic fan-out pattern with proper spacing and positioning, the assembly enables direct mass splicing without requiring individual fiber handling and alignment during the splicing process itself
2Reliability
If polytetrafluoroethylene (PTFE) furcation tubes are used for fiber routing, then fiber protection and routing are achieved, but material costs and overall assembly cost increase
Solution Approach 1:
The patent replaces expensive PTFE furcation tubes with a cost-effective polymeric material that encapsulates the fibers in the fan-out assembly. This polymeric material provides sufficient protection and routing functionality at a lower material cost, eliminating the need for costly PTFE components while maintaining fiber integrity
Solution Approach 2:
The polymeric material in the fan-out assembly serves multiple functions simultaneously: it protects fibers, provides structural support, enables fiber routing, and facilitates mass splicing. This multi-functional material replaces the need for separate PTFE tubes and other protective components, reducing overall material cost
3Strength
If separate housings and strength members are included in the fan-out assembly, then mechanical protection and structural integrity are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the functions of separate housings and strength members into an integrated fan-out assembly structure. The assembly combines fiber routing, mechanical support, and protective functions into a single unified structure, eliminating the need for separate housing components and strength members while maintaining structural integrity
Solution Approach 2:
The fan-out assembly structure serves multiple mechanical functions simultaneously: it provides fiber routing channels, structural support, mechanical protection, and alignment features for mass splicing. This multi-functional design eliminates the need for separate specialized components, reducing device complexity
4Ease of manufacture
If conventional fan-out assemblies are used with fixed pitch fiber arrangement, then fiber organization is simplified, but adaptability to different splicing configurations is reduced
Solution Approach 1:
The patent implements a variable pitch design in the fan-out assembly where the spacing between fibers changes along the length of the assembly. This dynamic pitch configuration allows fibers to be closely spaced in some regions for compact organization while providing larger spacing in other regions to accommodate different splicing configurations and tools, thereby achieving both ease of manufacture and adaptability
Data Source
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AI summary
An optical fiber fan-out assembly (100) includes multiple optical fibers (108) arranged in a one-dimensional array in a transition segment (106) in which spacing between fibers is varied from a first pitch (e.g., a buffered fiber diameter of 900 micrometer) to a second pitch (e.g., a coated fiber diameter of 250 micrometer). A polymeric material (118) encapsulates the optical fibers (108) in the transition segment (106), and the assembly (100) further includes multiple optical fiber legs (116) each terminated with a fiber optic connector (182). Optical fibers (122) extending beyond a boundary of the polymeric material (118) are subject to being mass fusion spliced to another group of multiple optical fibers, and the fusion splices (134) encapsulated with polymeric material (160), to form a fiber optic cable assembly. Methods for fabricating multi-fiber assemblies providing fan-out functionality are further provided, and the need for furcation tubes is avoided.