High-Fiber Optical Cable Sheath for Low-Friction Duct Laying
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Solution Overview
Problem
Optical fiber cables with high fiber counts face challenges in fusion-splicing time and increased traction tension during laying, particularly when high occupancy rates in ducts lead to deteriorated cable passing properties.
Innovation Solution
Incorporating a sheath material with 0.2% to 1.5% silicone and a polygonal cross-section, along with a multi-fiber connector and pitch conversion, reduces friction and allows for easier handling and connection, enhancing work efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of optical fibers is increased to 3000 or more, then the fiber count is improved, but the fusion-splicing time increases
Solution Approach 1:
The optical fiber cable is divided into multiple cable main bodies, each containing a manageable number of optical fibers (3000 or more). By segmenting the high fiber count into structured cable units with standardized connectors, the system enables modular connection rather than requiring fusion-splicing of all fibers individually, thus reducing total splicing time while maintaining high fiber capacity
Solution Approach 2:
Multi-fiber connectors are pre-assembled and connected to the optical fiber ends before final installation. This preliminary connection preparation allows for faster deployment since the connectors are ready-to-use and don't require on-site fusion-splicing, significantly reducing the time loss associated with connecting 3000 or more fibers
2Quantity of substance
If the occupancy rate in ducts is increased, then the space utilization is improved, but the cable passing property deteriorates due to increased traction tension
Solution Approach 1:
The sheath material is given a polygonal cross-section instead of a conventional circular shape. This geometric modification allows the cable to make point contact with the duct wall rather than line contact, reducing the friction coefficient and traction tension during cable laying. The curved polygonal shape enables better navigation through duct bends while maintaining high occupancy rates
Solution Approach 2:
The friction coefficient between the sheath material and duct surface is modified by incorporating 0.2% to 1.5% silicone into the sheath material composition. This parameter change reduces the static friction coefficient to 0.20 or more and 0.46 or less, enabling easier cable passage through ducts even at high occupancy rates, thus improving cable passing property without sacrificing space utilization
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 shortens fusion-splicing time and improves cable passing properties by reducing static friction and enabling point contact with ducts, thus improving overall laying efficiency.
Implementation Method 1
the static friction coefficient between the sheath material and a flat plate formed of stainless steel is 0.20 or more and 0.46 or less
Data Source
AI summary
An optical fiber cable includes a cable main body including 3000 or more optical fibers, a sheath material receiving therein the optical fibers, and a multi-fiber connector connected to ends of the optical fibers, in which the sheath material includes 0.2% or more by mass and 1.5% or less by mass of silicone.