Microstructured Optical Fiber Glass Composition for Low Damping
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Solution Overview
Problem
Microstructured optical fibers, particularly hollow-core fibers, suffer from corrosion-related damping increases and chlorine outgassing due to hydroxyl groups and halogen content in synthetic quartz glass, which are not effectively addressed by existing protective measures.
Innovation Solution
Incorporating synthetic quartz glass with a low chlorine concentration and high concentrations of oxygen deficiency centers to chemically bind moisture, thereby reducing damping and outgassing, and using a preform with similar glass properties to minimize chemical reactions and diffusion of moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If dehydration treatment using halogens (particularly chlorine) is applied to reduce hydroxyl group content, then optical damping is reduced, but chlorine outgassing and corrosion-related harmful effects increase
Solution Approach 1:
The patent changes the chemical composition parameters of the quartz glass by introducing oxygen deficiency centers (substoichiometric quartz glass with SiO2-x composition) and controlling chlorine concentration within specific ranges (1-300 ppm), thereby achieving low optical damping without excessive chlorine outgassing
Solution Approach 2:
The patent creates a composite glass system combining substoichiometric quartz glass (SiO2-x) with controlled halogen content, where the oxygen deficiency centers act as moisture traps and the low chlorine content reduces outgassing, achieving a balance between optical performance and chemical stability
2Object-generated harmful factors
If chlorine concentration is reduced to minimize outgassing, then harmful effects are reduced, but moisture binding capacity may be insufficient
Solution Approach 1:
The patent introduces oxygen deficiency centers as intermediary structures that mediate between moisture and the glass network, providing alternative moisture binding sites through Si-H bonds formed when water molecules react with oxygen-deficient regions, thereby maintaining moisture binding capacity independent of chlorine content
3Loss of energy
If hydroxyl group content is reduced to minimize damping, then optical performance improves, but corrosion resistance may be compromised
Solution Approach 1:
The patent changes the chemical parameters by controlling hydroxyl group content to ≤1 ppm and chlorine content to 1-300 ppm, while introducing oxygen deficiency centers that provide alternative mechanisms for moisture interaction, thereby achieving low damping without compromising corrosion resistance
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 solution effectively reduces corrosion-related damping and outgassing, maintaining low transmission losses and fiber integrity by immobilizing moisture through oxygen deficiency centers, enhancing the fiber's performance in high-field regions.
Implementation Method 1
oxygen deficiency centers which chemically bind moisture
Implementation Method 2
chlorine diffusing out of the quartz glass passes through a hollow channel
Data Source
AI summary
The invention relates to microstructured optical fibers that are drawn through hollow channels and have a core region, which extends along a fiber longitudinal axis, and a jacket region surrounding the core region. The aim of the invention is to reduce a damping increase due to corrosion and to reduce the emission of chlorine on the basis of the microstructured optical fibers. This is achieved in that at least some of the hollow channels are delimited by a wall material made of synthetic quartz glass which has a chlorine concentration of less than 300 wt. ppm and oxygen deficiency centers in a concentration of at least 2×1015 cm-3.