Antiresonant Hollow-Core Fibre Preform Bonding Under Negative Pressure
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Solution Overview
Problem
The production of anti-resonant hollow-core fibers is challenging due to their complex inner geometries, which are difficult to produce exactly and reproducibly, leading to deviations from the target geometry and reduced quality of the final fiber.
Innovation Solution
A method involving the application of negative pressures between the overlay and cladding tubes during the adding process to ensure precise and reproducible bonding, using a first negative pressure between the overlay and cladding tube surfaces and a second negative pressure inside the cladding tube, along with optional third pressures within anti-resonance element preforms, to maintain structural integrity and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If anti-resonant hollow-core fibers are produced using conventional methods, then the production process can be completed, but the complex inner geometries lead to deviations from target geometry and reduced quality
Solution Approach 1:
The method applies negative pressure to the cladding tube and anti-resonance element preforms before and during the adding process to prevent uncontrolled deformations. This preliminary stabilization ensures that the complex inner geometries maintain their target dimensions throughout the manufacturing process, resolving the contradiction between geometric precision and structural complexity
Solution Approach 2:
The invention changes the pressure parameter from ambient or positive pressure to negative pressure (vacuum) during the adding process. This parameter change stabilizes the complex inner geometries of the anti-resonance element preforms, preventing deformations and ensuring high manufacturing precision despite the intricate structural complexity
2Manufacturing precision
If negative pressure is applied during the adding process, then geometric precision is improved, but process complexity increases
Solution Approach 1:
The negative pressure application is segmented into distinct zones: first negative pressure for the cladding tube, second negative pressure for the anti-resonance element preforms, and optionally third negative pressure for the overlay tube. This segmentation allows independent control of each component, maintaining structural precision while managing process complexity through modular pressure control
3Stability of the object's composition
If multiple negative pressures are applied to different regions, then structural integrity is maintained, but control complexity increases
Solution Approach 1:
Different negative pressure values are applied to different local regions: the cladding tube receives a first negative pressure, the anti-resonance element preforms receive a second negative pressure, and the overlay tube may receive a third negative pressure. This local differentiation maintains optimal structural integrity for each component while managing control complexity through region-specific pressure optimization
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 method enables the cost-effective and large-volume production of high-precision anti-resonant hollow-core fibers by minimizing uncontrolled deformations and ensuring consistent structural elements, thereby improving the quality and reproducibility of the preform.
Implementation Method 1
a first negative pressure P1 is applied between overlay tube inner surface and cladding tube outer surface
Implementation Method 2
a second negative pressure P2 is applied inside the cladding tube during the adding
Data Source
AI summary
A method for producing a preform of an anti-resonant hollow-core fiber, which has a hollow core extending along a fiber longitudinal axis, and a cladding region surrounding the hollow core and includes at least one anti-resonance element. The method includes (a) providing a cladding tube having a cladding tube inner surface and a cladding tube outer surface, at least one anti-resonance element preform being arranged at the cladding tube inner surface, (b) providing an overlay tube including an overlay tube inner surface, the overlay tube having an inner diameter larger than an outer diameter of the cladding tube, (c) arranging the cladding tube inside the overlay tube, so that the overlay tube inner surface surrounds the cladding tube outer surface, and (d) adding the overlay tube to the cladding tube, so that the overlay tube inner surface connects to the cladding tube outer surface.