Optical Fiber Cable Embedded Strength Member Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical fiber ribbon cables suffer from lack of flexibility, high bend radius, and preferential bending due to embedded strength members, which complicates cable blowing operations and installation.
Innovation Solution
The optical fiber cable design includes a dry buffer tube made of low smoke zero halogen (LSZH) material with embedded strength members positioned 180 degrees apart, a water blocking tape, and a polyethylene outer layer, optimizing bend radius and flexibility while preventing water ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If strength members are embedded in the cable jacket, then tensile strength is improved, but flexibility deteriorates and bend radius increases
Solution Approach 1:
The cable structure is segmented into distinct functional layers: the jacket layer provides tensile strength through embedded strength members, while the inner buffer tube layer provides flexibility and bend resistance. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
The strength members are positioned at specific angular orientations (e.g., 0 degrees and 90 degrees) within the jacket layer, creating a multi-dimensional stress distribution pattern. This angular arrangement allows the cable to handle tensile loads from multiple directions while maintaining flexibility in operational bending.
2Strength
If strength members are embedded in the cable jacket, then tensile strength is improved, but preferential bending occurs
Solution Approach 1:
The strength members are asymmetrically positioned at specific angular orientations within the jacket layer rather than being uniformly distributed. This asymmetric arrangement creates balanced stress distribution that prevents preferential bending in any single direction while maintaining overall tensile strength.
Solution Approach 2:
The angular orientation parameter of the strength members is specifically adjusted (e.g., positioned at 0 and 90 degrees) to change the stress distribution pattern. This parameter optimization eliminates preferential bending by ensuring uniform load distribution across different bending planes.
3Ease of manufacture
If conventional cable structure is used, then manufacturing is simplified, but blowing performance deteriorates
Solution Approach 1:
The outer diameter parameter of the cable is optimized to specific ranges that improve blowing performance through aerial deployment. The jacket thickness and strength member dimensions are also parameter-adjusted to achieve the optimal balance between blowability and structural integrity.
Solution Approach 2:
The cable structure is designed to perform multiple functions: the optimized dimensions enable both effective aerial blowing deployment and maintain adequate tensile strength. The universal design allows the same cable structure to achieve both installation method (blowing) and mechanical performance requirements.
Data Source
AI summary
The present disclosure provides an optical fiber cable (100). The optical fiber cable (100) includes a plurality of optical fibers ribbons (102) lying substantially along a longitudinal axis (116) of the optical fiber cable (100). Further, the optical fiber cable (100) includes a first layer (104) surrounding the plurality of optical fibers ribbons (102). Furthermore, the optical fiber cable (100) includes a second layer (106) surrounding the first layer (104). Furthermore, the optical fiber cable (100) includes a third layer (108) surrounding the second layer (106). Moreover, the optical fiber cable (100) includes a fourth layer (140) surrounding the third layer (108). The first layer (104) is a water blocking tape. The third layer (108) is sandwich of water blocking material and ECCS steel tape. Moreover, the optical fiber cable (100) includes two pairs of strength members (112a-b; 112c-d) embedded inside the second layer (106).