Optical Fiber Manufacturing Exhaust Control
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Solution Overview
Problem
The manufacturing of optical fibers faces challenges such as deterioration of signal-to-noise ratio and nonlinear effects due to transmission losses and silica carbide particle accumulation, which affect the quality and attenuation coefficient of the fibers, and existing UV curing furnaces require manual monitoring of exhaust systems to maintain stable wind speeds, leading to potential production disruptions.
Innovation Solution
The optical fiber manufacturing process involves a fiber drawing furnace with inclined air inlets to prevent silica carbide particle deposition and an insulation annealing furnace for controlled temperature stress release, along with a UV curing furnace equipped with automatic exhaust system monitoring and adjustment to maintain optimal curing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If inert gas flows through the fiber drawing furnace in laminar flow mode, then SiC particles are prevented from depositing on the inner wall of graphite, but the exhaust system requires manual monitoring to maintain stable wind speed
Solution Approach 1:
The patent implements automatic feedback control by installing sensors (flow meters, temperature sensors) in the exhaust system that continuously monitor wind speed and temperature parameters. The control system automatically adjusts exhaust valve openings based on sensor feedback to maintain stable wind speed, eliminating manual monitoring and ensuring consistent fiber manufacturing quality.
2Manufacturing precision
If the exhaust wind speed is increased to remove volatiles faster, then curing quality improves, but the temperature in the UV curing furnace increases reducing furnace life
Solution Approach 1:
The patent optimizes exhaust wind speed parameters to operate at moderate levels that balance volatile removal efficiency with temperature control. By carefully selecting and adjusting exhaust flow rates, the system achieves adequate curing quality while preventing excessive temperature rise that would reduce furnace lifespan.
3Productivity
If the fiber drawing furnace operates for long periods, then production efficiency increases, but SiC particles accumulate on the inner wall of graphite affecting fiber quality
Solution Approach 1:
The patent maintains continuous effective operation of the fiber drawing furnace by implementing an automatic exhaust control system that continuously removes SiC particles from the furnace atmosphere. This continuous particle removal prevents accumulation on graphite surfaces, allowing the furnace to operate for extended periods without quality degradation, thus maintaining both high productivity and fiber quality.
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 results in optical fibers with reduced attenuation coefficients and increased effective area, improved fatigue resistance, and stable curing processes, ensuring consistent quality and extended production efficiency.
Implementation Method 1
The fiber preform at high temperature generates a small amount of silica by sublimation
Implementation Method 2
Inert gas is introduced in an upper portion of the fiber drawing furnace and, flows through the fiber drawing furnace into the annealing tube, thus the inert gas flows from up to down by mode of laminar flow
Implementation Method 3
the fiber is then inserted into two coaxial insulation annealing furnaces to release the internal stresses of the fiber
Implementation Method 4
Existing UV curing furnaces generally uses an air extraction system to reduce the temperature in the UV curing furnace (and to prolong a life of the UV curing furnace) and to extract volatiles of surface coating material of the optical fiber
Data Source
AI summary
An optical fiber comprises, from a center to a periphery, a fiber core of undoped silica; a cladding layer; and a coating of polyacrylate, wherein the fiber core has a radius of 5 to 7 μm and an ellipticity of less than 1.5%, the cladding layer with an ellipticity of less than 0.4% comprises inner, intermediate, and outer cladding layers, the inner cladding layer being doped with fluorine of 5 to 12 μm thickness, and refractive index difference to fiber core of −0.4 to −0.2%, the outer cladding layer being undoped quartz of 25 to 45 μm thickness, and the coating comprises an inner coating of 25 to 40 μm thickness, and an outer coating of 25 to 35 μm thickness and an ellipticity of less than 2%. The optical fiber has high durability and large effective transmission area, a method and system for preparing such optical fiber are also disclosed.