UV-Curable Polymeric Overcoating for Fusion Splice Miniaturization
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Solution Overview
Problem
Conventional methods for protecting fusion splices in optical fibers, such as heat shrink protection sleeves and recoating, are time-consuming, costly, and impractical for field deployment, and they do not allow for efficient bundling or stacking of protected fibers, limiting the miniaturization of fiber optic components.
Innovation Solution
A polymeric overcoating method that extends over the stripped and pre-coated sections of fusion spliced optical fibers, providing a flexible and durable protection that can be cured under UV light, allowing for efficient bundling and stacking of coated fibers, with properties such as high elongation, viscosity, and hardness to ensure mechanical integrity and resistance to environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional heat shrink protection sleeves or recoating methods are used to protect fusion splices, then splice protection is achieved, but the process is time-consuming and prevents efficient bundling or stacking of protected fibers
Solution Approach 1:
The patent changes the curing parameter from thermal (heat shrink) to photopolymerization (UV light), enabling rapid curing within seconds. The coating composition is modified to include photopolymerizable monomers and oligomers that cure quickly under UV exposure, dramatically reducing processing time while maintaining protection quality
Solution Approach 2:
The patent replaces the mechanical/thermal heat shrink system with a photopolymerization-based coating system. Instead of using heat to shrink and protect, the invention uses UV-curable coating that hardens through light exposure, eliminating the need for thermal processing equipment and reducing time
2Reliability
If conventional heat shrink protection sleeves are used to protect fusion splices, then splice protection is provided, but the size of splice protection increases, limiting miniaturization of fiber optic components
Solution Approach 1:
The patent applies a thin polymeric coating layer that conforms to the fiber surface, providing protection without adding significant bulk. The coating forms a flexible shell that protects the splice while maintaining a compact profile, enabling efficient bundling and stacking of multiple fibers
Solution Approach 2:
The patent transitions from three-dimensional heat shrink sleeves that wrap around fibers to a two-dimensional thin coating layer that envelops the fiber surface. This dimensional reduction significantly decreases the volume occupied by protection materials while maintaining protective functionality
3Reliability
If conventional recoating or heat shrink methods are used, then splice protection is achieved, but the process is costly and impractical for field deployment
Solution Approach 1:
The patent creates a self-contained system where the coating is applied and cured in a single integrated process. The UV-curable coating can be applied in the field and cured using portable UV light sources, eliminating the need for complex laboratory equipment or specialized facilities, making the process self-sufficient for field deployment
Solution Approach 2:
The patent extracts the essential protection function from complex conventional systems (heat shrink ovens, specialized recoating equipment) and implements it through a simplified UV-curable coating process. This extraction of the core protective function enables deployment in field conditions without requiring elaborate equipment
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
The polymeric overcoating method significantly reduces the size of splice protection, enhances mechanical strength, and allows for efficient packaging of optical fibers, improving handling and reducing the complexity of fiber optic component assembly while maintaining long-term reliability.
Implementation Method 1
contacting of stripped sections and pre-coated sections of fusion spliced at least one first and at least one second optical fibers with a polymeric overcoating material, followed by curing the polymeric overcoating
Data Source
AI summary
The present disclosure relates to a polymeric overcoating used as a splice protector, and a corresponding method of application where the resulting coated fusion spliced optical fibers or coated fusion spliced optical fiber ribbons can be bundled or stacked to reduce the size of splice protection.