Powder Coupling for Fiber Optic Cable Axial Displacement
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Solution Overview
Problem
Existing fiber optic cables face issues with axial displacement and buckling of optical fibers due to insufficient coupling, leading to signal attenuation, and current coupling methods like foam tape, binder yarn, and adhesives are cumbersome, increase cable diameter, and raise material costs.
Innovation Solution
The use of first and second powders integrated with specific surfaces within the fiber optic cable, creating interfaces with varying coupling forces to manage axial displacement and buckling, while maintaining cable flexibility and reducing material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If foam tape, binder yarn, grease, or adhesives are used to facilitate coupling between elements and surrounding structure, then coupling is improved, but cable diameter increases and material costs increase
Solution Approach 1:
The patent extracts the coupling function from bulky materials like foam tape and binder yarn, concentrating it into a thin layer of powder applied directly to the element surfaces. This extraction eliminates the need for thick coupling materials while maintaining effective coupling between elements and surrounding structure.
Solution Approach 2:
The patent changes the physical state and application method of the coupling material from solid/bulk forms (foam tape, binder yarn) to a powder form that can be applied as a thin coating. This parameter change reduces the material thickness and volume while maintaining the coupling function.
2Reliability
If foam tape, binder yarn, grease, or adhesives are used to facilitate coupling, then coupling is improved, but manufacturing complexity and material costs increase
Solution Approach 1:
The patent extracts the coupling function from complex manufacturing processes involving foam tape application, binder yarn winding, and adhesive coating. The powder form factor simplifies the manufacturing process by allowing direct application to element surfaces without requiring complex handling and positioning procedures.
Solution Approach 2:
The patent uses a powder material that can be easily applied and removed, replacing expensive and cumbersome materials like binder yarn that require careful handling and positioning. The powder form allows for simpler, more flexible manufacturing processes.
3Ease of operation
If elements are insufficiently coupled, then cable flexibility is maintained, but axial displacement and buckling of optical fibers occur leading to signal attenuation
Solution Approach 1:
The patent applies different powder characteristics to different interfaces within the cable structure. At interfaces requiring high coupling to prevent buckling, the powder provides strong frictional coupling. At interfaces where flexibility is needed, the powder layer allows controlled movement. This local differentiation of coupling strength resolves the contradiction between flexibility and signal integrity.
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
This solution effectively reduces signal attenuation by enhancing coupling between cable elements, allowing for better thermal expansion management and manufacturing efficiency without increasing cable diameter or material costs.
Implementation Method 1
Frictional coupling of elements to adjoining structure within the cables
Data Source
AI summary
A fiber optic cable includes a jacket, an element of the cable interior to the jacket, and first and second powders. The element includes a first surface and a second surface. The cable further includes a third surface interior to the jacket and facing the first surface at a first interface and a fourth surface interior to the jacket and facing the second surface at a second interface. At least one of the third and fourth surfaces is spaced apart from the jacket. The first powder is integrated with at least one of the first and third surfaces at the first interface and the second powder integrated with at least one of the second and fourth surfaces at the second interface. The first interface has greater coupling than the second interface at least in part due to differences in the first and second powders.