Optical Fiber Preform Drawing for Longitudinal Diameter Uniformity
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Solution Overview
Problem
Existing methods for drawing optical fiber glass preforms with local outer diameter variations or inclinations in the longitudinal direction require multiple drawing steps, leading to inefficiencies, material waste, and deviations in optical properties.
Innovation Solution
Implement a drawing method that uses the least squares method to determine a regression line based on continuous outer diameter measurements, controlling the drawing process to achieve a slope of less than 0.005 mm/mm and curvature of 0.003 or less, allowing for uniform diameter adjustment across multiple drawing devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If repeated drawing steps are performed to reduce outer diameter variation, then manufacturing precision is improved, but processing time increases and silica evaporation causes optical property deviations
Solution Approach 1:
The patent applies preliminary action by carefully controlling the initial drawing conditions (heating temperature, drawing speed, reduction ratio) to minimize outer diameter variation from the start. By optimizing these parameters before multiple drawing steps become necessary, the patent reduces the need for repeated processing while maintaining precision.
Solution Approach 2:
The patent employs parameter changes by systematically adjusting drawing parameters (heating temperature, drawing speed, reduction ratio) to achieve the desired outer diameter uniformity. By finding optimal parameter combinations, the patent minimizes the number of drawing steps required while maintaining manufacturing precision.
2Manufacturing precision
If repeated drawing steps are performed to reduce outer diameter variation, then manufacturing precision is improved, but silica evaporation increases causing optical property deviations
Solution Approach 1:
The patent applies preliminary action by optimizing initial drawing conditions to minimize outer diameter variation, thereby reducing the need for repeated drawing steps. This preliminary optimization prevents excessive silica evaporation that would occur with multiple processing cycles.
Solution Approach 2:
The patent converts the potential harm of silica evaporation into a benefit by carefully controlling drawing parameters to achieve uniform outer diameter in fewer steps. By accepting controlled, minimal evaporation during optimized drawing processes, the patent achieves precision without excessive material loss.
3Manufacturing precision
If drawing process is performed to reduce outer diameter variation, then manufacturing precision is improved, but processing complexity increases
Solution Approach 1:
The patent employs parameter changes by systematically adjusting drawing parameters (heating temperature, drawing speed, reduction ratio) to achieve the desired outer diameter uniformity. By finding optimal parameter combinations, the patent minimizes the number of drawing steps required while maintaining 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 reduces the need for additional drawing steps, minimizes material waste, and maintains consistent optical properties by ensuring uniformity in the preform's outer diameter, thus optimizing the drawing process.
Implementation Method 1
a heating source that heats and softens the glass preform
Implementation Method 2
the sintered glass gradually rises upward from the bottom, causing a outer diameter variation
Data Source
AI summary
Provided is an optical fiber glass preform, in a preliminary step of a final drawing step, in which the optical fiber glass preform is undergone one or more drawing steps to be drawn to a final target diameter, wherein as an outer diameter of an effective portion of the glass preform is continuously measured in a longitudinal direction, and from outer diameter measurement results obtained, a regression line of y=ax+b is obtained using the least squares method with y as the outer diameter and x as a length, an absolute value of a slope a is less than or equal to 0.005 mm/mm; and a maximum value of an obtained absolute value of a curvature of the outer diameter at any given point, in the outer diameter measurement results obtained, is 0.003 or less.