Optical Fiber Preform Surface Modification via Chlorine and Flame Polishing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The manufacturing of optical fiber preforms often results in damaged and uneven outer layers due to embedded particles and impurities, leading to reduced strength and quality of optical fibers during mechanical loading.
Innovation Solution
A method involving surface treatment with chlorine to remove impurities and followed by flame polishing at 1000-1400°C to create a smooth, impurity-free optical fiber preform with enhanced tensile strength and reduced proof test breaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the optical fiber preform is drawn directly without surface treatment, then the manufacturing process is simple and fast, but the surface contains embedded particles and impurities that reduce fiber strength
Solution Approach 1:
The patent applies preliminary surface treatment actions (chlorine treatment followed by flame polishing) to the optical fiber preform before the drawing process. This preliminary action removes embedded particles and impurities from the surface, preventing them from causing strength reductions during subsequent fiber drawing and mechanical loading.
2Reliability
If chlorine treatment and flame polishing are applied to the preform surface, then impurities and particles are removed improving fiber quality, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The patent changes the chemical and physical parameters of the preform surface through chlorine treatment (chemical modification) and flame polishing (thermal treatment at high temperature). These parameter changes transform the surface properties to eliminate impurities and particles, thereby improving fiber quality and reliability.
3Reliability
If the preform surface is left untreated, then the manufacturing process is efficient, but surface cracks and damages remain causing proof test breaks
Solution Approach 1:
The patent replaces mechanical surface treatment methods with chemical (chlorine treatment) and thermal (flame polishing) processes. This substitution effectively removes surface cracks and damages without the complexity of mechanical polishing equipment, improving proof test performance while maintaining manufacturing feasibility.
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 method results in a modified optical fiber preform with elevated long length tensile strength, reduced proof test breaks, and a smooth surface free from metallic impurities and defects, improving the overall quality of optical fibers.
Implementation Method 1
the treatment of the surface of the initial optical fiber preform with chlorine discourages adhesion of foreign particles to the surface of the initial optical fiber preform through the formation of metal chlorides which are significantly volatile at treatment temperature to be removed from the surface of initial optical fiber preform
Implementation Method 2
the flame polishing is performed at a temperature in a range of about 1000-1400° C
Implementation Method 3
The flame polishing is performed to convert the initial optical fiber into a modified optical fiber preform. The modified optical fiber preform has a smooth surface
Data Source
AI summary
The present disclosure provides a method for modification of surface of an initial optical fiber preform. The initial optical fiber preform is manufactured using at least one preform manufacturing process. The surface of the initial optical fiber preform is treated with 50-70 liters of chlorine per square meter of the surface of the initial optical fiber preform. The surface of the initial optical fiber preform is flame polished using a flame polishing module. The treatment of the surface of the initial optical fiber preform with chlorine and flame polishing of the surface of the initial optical fiber preform collectively converts the initial optical fiber preform into a modified optical fiber preform.