Dual-Layer Fiber-Optic Buffer for Low Insertion Force and Kink Resistance
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Solution Overview
Problem
High-density fiber-optic connectors require significant engagement forces due to cumulative buffer insertion forces, making manual connection challenging, and existing cables lack sufficient kink resistance, which is critical in aerospace applications where space and weight are limited.
Innovation Solution
A fiber-optic cable design featuring a semi-loose buffer system with a low-density expanded PTFE first layer and a continuous high-modulus polyimide second layer, along with a slip layer and a strength member, reduces buffer insertion force and enhances kink resistance without compromising optical, mechanical, or thermal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high-density fiber-optic connectors are used to increase cable density, then the quantity of cables transmitted increases, but the engagement force increases linearly making manual connection difficult
Solution Approach 1:
The buffer is segmented into two distinct layers: an inner buffer layer (22) and an outer buffer layer (24). The inner buffer layer is formed of a soft, compliant material that allows the fiber to telescope easily, reducing the force required. The outer buffer layer provides structural support while maintaining low friction. This segmentation allows each layer to perform its specific function optimally, resolving the contradiction between high cable density and manageable engagement force.
Solution Approach 2:
The patent changes the material parameters of the buffer layers, specifically using a soft, compliant material for the inner buffer layer with low friction characteristics. This parameter change enables the fiber to slide smoothly during connector mating, significantly reducing the engagement force even when multiple cables are connected in high-density configurations.
2Ease of operation
If the buffer material is made softer to reduce buffer insertion force, then the ease of operation improves, but the kink resistance deteriorates
Solution Approach 1:
The buffer is divided into two layers with different material properties. The inner buffer layer (22) is made of a soft, compliant material that reduces buffer insertion force and allows easy telescope of the fiber during connector mating. The outer buffer layer (24) is made of a tougher material that provides kink resistance and structural protection. This segmentation allows the system to achieve both ease of operation and adequate strength simultaneously.
Solution Approach 2:
The patent uses a composite buffer structure combining two different materials: a soft, compliant inner buffer layer material and a tougher outer buffer layer material. This composite construction allows the inner layer to provide low friction for easy insertion while the outer layer provides mechanical strength and kink resistance, resolving the contradiction between softness for ease of operation and strength for kink resistance.
Data Source
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AI summary
A fiber-optic cable with low buffer insertion force, significant kink resistance, and improved thermal performance incorporating a dual layer buffer of a low density material (62) beneath a continuous seamless high modulus material (64) without compromising low smoke, toxicity, and f lammability. The fiber-optic cabl also may comprise a slip layer (66), a strength layer (68) and an oute jacket (70).