Optical Fiber Winding Strain Control for Coating Deformation
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Solution Overview
Problem
The challenge is to prevent winding collapse and coating deformation of optical fibers during the manufacturing process, especially when longer lengths are wound around a bobbin, which leads to increased transmission loss in low-temperature environments.
Innovation Solution
The method involves setting specific winding conditions, including a strain relaxation coefficient Tε/K of 292 or lower and a one-layer strain εn of 0.01 or higher, to maintain the optical fiber's wound state and prevent coating deformation, thereby ensuring efficient manufacturing and maintaining microbend characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the length of optical fiber wound around one bobbin is increased to improve manufacturing efficiency, then productivity is improved, but coating deformation occurs and transmission loss increases in low-temperature environments
Solution Approach 1:
The invention changes the physical parameters of the optical fiber by controlling the coating thickness to be 3 μm or more and the Young's modulus ratio (coating/bare fiber) to be 0.05 or less. These parameter adjustments allow the fiber to withstand the stresses of long-distance winding without coating deformation, enabling longer lengths to be wound around one bobbin while maintaining manufacturing precision.
2Manufacturing precision
If winding tension is reduced to suppress coating deformation, then coating deformation is suppressed, but winding collapse is likely to occur
Solution Approach 1:
The invention modifies the mechanical parameters of the optical fiber structure by optimizing the coating thickness and Young's modulus ratio. This creates a fiber structure with enhanced flexibility and stress distribution capabilities, allowing winding to be performed at reduced tension levels without causing coating deformation, while the controlled parameters prevent winding collapse by maintaining structural integrity.
Solution Approach 2:
The invention uses a composite structure consisting of the bare optical fiber and the coating layer with specific property ratios. The coating layer acts as a protective composite that distributes mechanical stresses, preventing both coating deformation under low tension and winding collapse, thereby resolving the contradiction between suppressing deformation and preventing collapse.
3Ease of manufacture
If the size of optical fiber preform is increased to reduce costs, then manufacturing cost is reduced, but the length of optical fiber that can be wound around one bobbin must be increased, exacerbating coating deformation
Solution Approach 1:
The invention establishes specific parameter thresholds (coating thickness ≥3 μm, Young's modulus ratio ≤0.05) that enable the optical fiber to maintain structural integrity during extended winding operations. These parameter changes allow manufacturers to use larger preforms for cost reduction while winding longer fiber lengths without suffering from coating deformation, thus resolving the contradiction between manufacturing cost and manufacturing precision.
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 effectively prevents winding collapse and coating deformation, maintaining low transmission loss across temperature variations and improving manufacturing efficiency by allowing longer optical fibers to be wound around a bobbin without compromising performance.
Implementation Method 1
a strain relaxation coefficient Tε/K is 292 or lower, and an one-layer strain εn is 0.01 or higher
Data Source
AI summary
A method of manufacturing an optical fiber, in which a coating is provided on a bare optical fiber, includes winding the optical fiber around a bobbin such that a strain relaxation coefficient Tε/K is less than or equal to 292, and an one-layer strain εn is greater than or equal to 0.01.