All-dry Optical Fiber Ribbon Cable High Elastic Buffer
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Solution Overview
Problem
All-dry optical fiber ribbon cables are prone to fiber ribbon damage and high light attenuation due to extrusion from the waterproof layer and loose tube, which reduces laying efficiency and transmission quality.
Innovation Solution
An all-dry optical fiber ribbon cable design featuring a high elastic polymer first buffer layer with specific Shore hardness and tensile strength, strategically positioned to separate fiber ribbons from the waterproof layer and loose tube, reducing deformation and damage, and incorporating a second buffer layer for additional protection and water blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an all-dry optical fiber ribbon cable uses a waterproof layer to block water, then water blocking is achieved without ointment removal, but fiber ribbon damage and light attenuation increase due to extrusion pressure
Solution Approach 1:
A buffer layer is introduced as an intermediary component between the fiber ribbon and the waterproof layer. This buffer layer absorbs the extrusion pressure from the waterproof layer and loose tube, preventing direct transmission of compressive forces to the fiber ribbon. The buffer layer is positioned concentrically around the fiber ribbon, creating a protective cushion that maintains fiber integrity while allowing the all-dry water blocking structure to function effectively during laying operations.
2Device complexity
If the fiber ribbon is directly exposed to the waterproof layer and loose tube, then the structure is simplified, but deformation and light attenuation of the fiber ribbon increase
Solution Approach 1:
The cable structure is segmented into distinct functional layers: the fiber ribbon unit, the buffer layer, the waterproof layer, and the loose tube. This segmentation allows each component to perform its specific function independently. The buffer layer is separated as a distinct segment that provides mechanical protection, while the waterproof layer maintains water blocking functionality. This segmented structure prevents direct contact between the fiber ribbon and external pressure sources, reducing deformation while maintaining reasonable structural complexity.
3Reliability
If a buffer layer is added to protect the fiber ribbon, then fiber damage and attenuation are reduced, but the cable structure becomes more complex
Solution Approach 1:
The buffer layer is designed as a flexible thin-film structure that provides effective mechanical protection while minimizing added complexity. The buffer layer material is selected to be compliant and flexible, allowing it to conform to the fiber ribbon geometry without creating rigid structural constraints. This thin-film approach absorbs extrusion pressures effectively while maintaining cable flexibility and avoiding excessive structural complexity that would arise from thicker or more rigid protective structures.
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 solution effectively reduces fiber ribbon deformation and light attenuation, enhancing the laying efficiency and transmission quality by providing a protective buffer against external pressures and maintaining water blocking without the need for ointment removal during installation.
Implementation Method 1
the first buffer layer is a high elastic polymer material layer, and a Shore hardness of the first buffer layer is 45HA-85HA, a tensile strength of the first buffer layer is greater than or equal to 10 MPA, a breaking elongation of the first buffer layer is 200%-600%, and a compression permanent deformation rate of the first buffer layer is less than or equal to 30%
Data Source
AI summary
The present application provides an all-dry optical fiber ribbon cable, including an optical unit, a first buffer layer, a first waterproof layer, a loose tube, a second waterproof layer, an armor layer, and a protective layer; where the optical unit includes a plurality of fiber ribbons; the first buffer layer, the first waterproof layer, the loose tube, the second waterproof layer, the armor layer, and the protective layer are sequentially sleeved over the plurality of fiber ribbons. The first buffer layer is a high elastic polymer material layer, and a Shore hardness of the first buffer layer is 45HA-85HA, a tensile strength of the first buffer layer is greater than or equal to 10 MPA, a breaking elongation of first buffer layer is 200%-600%, and a compression permanent deformation rate of the first buffer layer is less than or equal to 30%.