Flexible Fiber Optic Ribbon Cable Design
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Solution Overview
Problem
Traditional fiber optic ribbon cables exhibit strong preferential bending and inflexibility due to buffer tubes and rigid strength members, making them less suitable for cost-sensitive applications requiring high bandwidth and flexibility, such as data center interconnects.
Innovation Solution
A fiber optic ribbon cable design featuring a stack of ribbons with flexible strength members and a round, uniformly thick jacket that allows for free movement and decouples bend preference, reducing stress on optical fibers and enabling flexible bending without kinking or attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional ribbon cables use buffer tubes and rigid strength members to protect the ribbon stack, then structural strength and protection are improved, but flexibility and bend preference worsen
Solution Approach 1:
The patent replaces rigid buffer tubes with a flexible jacket that surrounds the ribbon stack. The jacket is made of flexible material that allows the cable to bend without imposing preferential bending on the ribbon stack, while still providing protection. This resolves the contradiction by maintaining structural protection through the flexible jacket while enabling genuine flexibility in the cable.
Solution Approach 2:
The patent introduces a dynamic relationship between the ribbon stack and the jacket by allowing the stack to move freely within the jacket. The ribbon stack can shift position dynamically as the cable bends, rather than being fixed in a rigid structure. This dynamic arrangement eliminates bend preference while maintaining protection, resolving the contradiction between strength and flexibility.
2Reliability
If ribbon cables use rigid strength members and buffer tubes, then cable protection is improved, but bend preference and inflexibility worsen
Solution Approach 1:
The flexible jacket serves as a protective shell that does not constrain the ribbon stack's movement. It provides cable protection through its flexible nature rather than through rigidity, allowing the cable to adapt to various bending configurations without preferential direction, thus resolving the contradiction between protection and adaptability.
Solution Approach 2:
The patent segments the cable structure into a protective jacket and a free-moving ribbon stack. This segmentation allows the jacket to provide protection while the stack maintains independence and flexibility, resolving the contradiction by separating the protective function from the flexible function into distinct components.
3Stability of the object's composition
If ribbon cables have a long lay-length to maintain stack integrity, then structural stability is improved, but flexibility and ease of routing worsen
Solution Approach 1:
The patent creates a dynamic system where the ribbon stack can move freely within the jacket without being constrained by a long lay-length. The stack maintains its integrity through its own internal structure while being able to shift position dynamically as the cable is routed, resolving the contradiction between stability and ease of routing.
Solution Approach 2:
The flexible jacket provides a loose containment that allows the ribbon stack to move and adapt to routing requirements without imposing structural constraints. This flexible enclosure maintains stack integrity while enabling easy routing, resolving the contradiction between stability and operational ease.
Data Source
AI summary
A fiber optic ribbon cable includes a fiber optic ribbon or stack of ribbons, strength members surrounding the ribbon or stack, and a jacket defining an exterior of the cable. The jacket forms a cavity through which the strength members and the ribbon or stack extend. The ribbon or stack has a bend preference, but the strength members are flexible and do not have a bend preference. Furthermore, the jacket is structured such that the jacket does not have a bend preference. The cavity is sized relative to the ribbon or stack in order to allow the same to bend and twist within the cavity with respect to the jacket as the cable bends, facilitating movement of the corresponding optical fibers to low-stress positions within the cavity and decoupling the bend preference of the ribbon or stack from transfer to the jacket.