Anti-Resonance Fiber Preform With Two-Point Contact Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing anti-resonant hollow-core fibers face challenges in industrial production due to complex inner geometries and deformations during the fiber drawing process, leading to deviations from target geometry and increased attenuation, particularly in preforms larger than 1 m and 40 mm in diameter.
Innovation Solution
The design of anti-resonance element preforms with ARE outer and inner elements connected in a circular arc-like manner, allowing for precise positioning and reproducible production, with the ARE inner element partially protruding into the inner space of the ARE outer element, enabling efficient attenuation of higher order modes and low overall attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plate-like ARE inner element is used, then manufacturing is simplified, but during elongating the ARE inner element comes to rest on inner wall of cladding tube, causing increased attenuation
Solution Approach 1:
The ARE inner element is designed with a curved surface (circular arc-like shape) instead of a flat plate-like structure. This curvature allows the element to maintain its position during elongating without coming to rest on the inner wall of the cladding tube, thereby preventing increased attenuation while remaining manufacturable.
2Strength
If tubular ARE elements connected along a connecting line are used, then structural integrity is improved, but during elongating the ARE elements perform rotatory movement disturbing even distribution, causing increased attenuation
Solution Approach 1:
The ARE elements are designed with a circular arc-like shape and connected along two parallel connecting lines rather than a single line. This configuration provides structural integrity while preventing rotatory movement during elongating, ensuring even distribution and low attenuation.
Solution Approach 2:
The connection configuration transitions from a single-line connection to a two-line parallel connection, adding dimensional stability. This prevents rotatory movement by constraining the ARE elements in an additional degree of freedom, thereby maintaining even distribution during elongating.
3Productivity
If preform size is increased for industrial production, then fiber length and productivity are improved, but geometric deviations and deformations increase, affecting precision
Solution Approach 1:
The circular arc-like design of the ARE elements and their connection along two parallel lines creates a geometrically stable configuration that maintains precision during elongating of large preforms. This curved geometry resists deformations better than linear configurations, enabling industrial-scale production while maintaining geometric accuracy.
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 enables the production of anti-resonant hollow-core fibers with improved symmetry and optical properties, achieving low attenuation and precise geometry, suitable for industrial-scale production of fibers exceeding 1 m and 40 mm in diameter.
Implementation Method 1
The evenly distributed around the hollow core walls of the anti-resonance elements can act as Fabry-Perot cavities, which are operated in anti-resonance and reflect the incident light guiding it through the fiber core.
Implementation Method 2
The periodic structure in the cladding causes the effect, which with a reference to the semiconductor technology is referred to as 'photonic bandgap', according to which light of certain wavelength ranges scattered at the cladding structures interferes constructively due to Bragg reflection in the central cavity and cannot propagate transversely in the cladding.
Data Source
AI summary
An anti-resonance element preform for producing an anti-resonant hollow-core fiber, comprising a first longitudinal axis, an ARE outer element designed in a circular arc-like manner, and an ARE inner element, wherein the ARE outer element and the ARE inner element are connected to one another along two connecting lines, which are arranged essentially in parallel to the first longitudinal axis. It is provided that the ARE outer element has an inner space, which is at least partially limited by an ARE outer wall and into which the ARE inner element, designed in a circular arc-like manner, protrudes at least partially.