Optical Cable Film Binder for Low-Attenuation Fiber Packing
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Solution Overview
Problem
Optical communication cables with tightly packed optical fibers face issues of strain-based attenuation due to uneven distribution of binding forces, which can lead to unraveling and damage during installation and handling.
Innovation Solution
The use of a thin film or elastic sleeve extruded around core elements, providing a radial inwardly directed force to maintain the wound pattern and evenly distribute binding forces, preventing unraveling and reducing strain-based attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If optical fibers are tightly packed to reduce cable size, then the cross-sectional area is reduced, but strain-based attenuation increases due to uneven distribution of binding forces
Solution Approach 1:
A thin film binder is applied around the group of optical fibers to provide uniform radial binding forces. The thin film distributes the binding forces evenly across all fibers, preventing the uneven stress distribution that occurs with traditional tight packing methods, thereby reducing strain-based attenuation while maintaining a compact cross-sectional area.
Solution Approach 2:
The binding force distribution is changed from uneven (in traditional tight packing) to uniform (through thin film application). This parameter change in force distribution ensures that all optical fibers experience equal radial compression, eliminating the strain-based attenuation problems associated with uneven binding forces while maintaining reduced cable dimensions.
2Stability of the object's composition
If core elements are wound around a strength member to provide structural integrity, then the cable maintains its shape, but the binding forces become uneven causing strain-based attenuation
Solution Approach 1:
The thin film binder is applied around the wound core elements to provide an additional layer of uniform radial compression. This thin film ensures that the binding forces are distributed evenly across all optical fibers within the wound structure, preventing the uneven stress distribution that would otherwise occur due to the winding process, thereby maintaining structural integrity while reducing strain-based attenuation.
Solution Approach 2:
The thin film acts as an intermediary between the wound core elements and the optical fibers. It mediates the binding forces by distributing them uniformly across all fibers, preventing direct contact points of high stress that would cause strain-based attenuation, while still allowing the wound structure to maintain its structural integrity.
3Reliability
If a thin film binder is applied to evenly distribute binding forces, then strain-based attenuation is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The thin film binder provides a simple yet effective solution to the complex problem of uneven force distribution. By applying a single thin film layer around the fiber group, the manufacturing process achieves uniform binding forces without requiring complex multi-component assembly or precise positioning mechanisms, thereby reducing strain-based attenuation while adding minimal manufacturing complexity.
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 thin film binder maintains the core elements in a fixed position, reducing strain-based attenuation and ensuring structural integrity during cable assembly and installation, while allowing for smaller cross-sectional area and low excess fiber length.
Implementation Method 1
The elastic sleeve includes an inner surface facing the outer surface of the first core element and the outer surface of the second core element. The elastic sleeve applies a radial inwardly directed force to the outer surface of the first core element and the outer surface of the second core element.
Data Source
AI summary
An optical communication cable is provided having a cable body with an inner surface defining a passage within the cable body and a plurality of core elements within the passage. A film surrounds the plurality of core elements, wherein the film directs a radial force inward onto the plurality of core elements to restrain and hold the plurality of core elements in place.