Flexible Optical Fiber Cable Composite Loose Tube Design
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Solution Overview
Problem
Conventional optical fiber cables have stiff loose tubes and outer sheaths that make handling difficult due to their rigidity, leading to issues with kink defects and increased diameter, which complicates storage and transport.
Innovation Solution
A flexible optical fiber cable design featuring loose tubes and outer sheaths composed of a mixture of materials with varying flexural moduli, where the first material has a flexural modulus of at least 1000 MPa and the second material has a flexural modulus of up to 50 MPa, reducing kink and bend diameters and improving handling ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polymer materials like polypropylene and polyethylene are used for loose tubes and outer sheath, then structural integrity and crush resistance are improved, but flexibility and ease of handling deteriorate
Solution Approach 1:
The patent employs composite materials by blending polypropylene (providing structural integrity and crush resistance) with polybutene-1 (providing flexibility and low-temperature performance). This composite approach allows the cable to simultaneously achieve high strength and flexibility, resolving the contradiction between structural requirements and handling ease.
Solution Approach 2:
The patent modifies material parameters by adjusting the flexural modulus through additive combinations. By controlling the ratio and properties of polypropylene and polybutene-1, the cable achieves optimal balance between stiffness (for structural integrity) and flexibility (for handling), directly addressing the contradiction through parameter optimization.
2Strength
If cable diameter is increased to provide more protection and strength, then mechanical protection is improved, but ease of handling and coiling deteriorates
Solution Approach 1:
The use of composite materials with optimized flexural modulus allows the cable to maintain high mechanical protection even at larger diameters while preserving coiling flexibility. The polybutene-1 component specifically contributes to low-temperature flexibility and ease of coiling, counteracting the increased stiffness from larger diameter and enhanced protection.
3Reliability
If stiff materials are used for loose tubes, then mechanical isolation and damage prevention are improved, but ease of installation and reduction of kink defects deteriorates
Solution Approach 1:
The composite formulation combines polypropylene's damage prevention capabilities with polybutene-1's resistance to kink defects and ease of installation properties. This material synergy allows the cable to be both protective and installation-friendly, resolving the contradiction between reliability and operational ease.
Solution Approach 2:
By optimizing the flexural modulus parameter through material composition control, the cable achieves the right balance between stiffness (for damage prevention) and flexibility (for installation ease and kink resistance). The parameter adjustment ensures the cable is stiff enough to protect fibers but flexible enough for easy handling during installation.
Data Source
AI summary
The present disclosure provides an optical fiber cable (100). The optical fiber cable (100) includes one or more optical fiber (102), one or more loose tube (104) surrounding the one or more optical fiber (102) and an outer sheath (108) surrounding the one or more loose tube (104). The material composition of the one or more loose tube (104) is a mixture of a first material and a second material. The flexural modulus of the first material is at least 1000 MPa. The flexural modulus of the second material is at most 50 MPa. The material composition of the outer sheath (108) is a mixture of a first material and a second material. The flexural modulus of the first material is at least 500 MPa. The flexural modulus of the second material is at most 50 MPa.