Optical Fiber Twisting Tension Path Design
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Solution Overview
Problem
Existing methods for producing optical fibers struggle to achieve sufficient twisting to reduce Polarization-Mode Dispersion (PMD) due to installation restrictions that limit the free path length and require low winding tension to maintain fiber characteristics, resulting in insufficient twisting efficiency.
Innovation Solution
A method that applies a high tension load to the optical fiber in a specific zone without affecting the winding tension, using a twist imparting portion to alternately impart twists, with a twisting amount of at least 2 turns/m, and employing a free path length and tension relationship (R = a x T x L^b) to enhance twisting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a swing guide roller is used to impart twists to the optical fiber, then the PMD is reduced, but the installation restrictions limit the free path length and require low winding tension, resulting in insufficient twisting efficiency
Solution Approach 1:
The invention changes the physical parameters of the optical fiber system by applying high tension load (T) in a specific zone, which modifies the fiber's mechanical state to enable sufficient twisting (R ≥ 2 turns/m) despite limited free path length (L). The relationship R = a x T x L^b demonstrates that increasing tension compensates for reduced length, maintaining twisting efficiency while preserving PMD reduction benefits.
2Productivity
If high tension load is applied to enhance twisting efficiency, then the twisting amount increases, but it may affect the winding tension and fiber characteristics
Solution Approach 1:
The invention applies high tension load only in a specific localized zone rather than uniformly along the entire fiber path. This localized application allows the tension to be concentrated where needed for twisting (in the zone with free path length L) while maintaining low tension in other sections, particularly near the winding bobbin, thereby preserving fiber characteristics and winding quality.
Solution Approach 2:
The fiber path is segmented into different functional zones: a high-tension zone for twisting application and a low-tension zone for winding. By dividing the continuous fiber path into these distinct segments with different tension requirements, the system achieves both high twisting efficiency and maintained fiber characteristics without conflict.
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
This approach allows for efficient twisting of optical fibers, reducing PMD while maintaining the usual winding tension, thereby improving the fiber's transmission capabilities.
Implementation Method 1
when the rotation axis y of the swing guide roller 9 is swung by +θ about the drawing direction axis z, a lateral force is applied to the coated optical fiber 3' by the swinging operation, and the coated optical fiber 3' rolls along the surface of the swing guide roller 9
Implementation Method 2
providing a zone where a high tension load (T) is allowed to be applied to the optical fiber without affecting winding tension of the winding bobbin
Data Source
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AI summary
An optical fiber producing method and apparatus are provided in which sufficient pulling tension is applied to an optical fiber to enhance the twisting efficiency without affecting winding tension of a winding bobbin, whereby the PMD of the optical fiber can be reduced. In a method of producing an optical fiber in which, in a path where an optical fiber 11 is reeled out from a supply bobbin 10, taken up by take-up means 20, and wound by a winding bobbin 24, twists are alternately imparted to the optical fiber 11 by a twist imparting portion 18, a zone where a high tension load is allowed to be applied to the optical fiber without affecting winding tension of the winding bobbin is disposed, a twist is imparted in the zone, and, when tension immediately before the twist imparting portion is indicated by T (g), a free path length is indicated by L, a twisting amount is indicated by R (turns/m), and a and b are constants, the tension and free path length by which the twisting amount R approximated by "R = a × T × Lb" is made "2" or more are set