Anti-resonant Hollow-core Fiber Precursor Formation
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Solution Overview
Problem
Anti-resonant hollow-core fibers with nested structural elements face challenges in precise and reproducible production due to complex internal geometries and difficulties in maintaining resonance or anti-resonance conditions, especially with conventional 'stack and draw' techniques, which struggle to achieve uniform wall thickness and exact positioning of anti-resonance elements.
Innovation Solution
The method involves forming elongated pressure chambers within the cladding tube wall to deform and bulge sections, creating anti-resonance elements through pressure and heat, allowing for precise positioning and formation of anti-resonance elements without the need for precise positioning of prefabricated preforms, using techniques like forming hollow channels or longitudinal slots to facilitate gas pressure-induced deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional 'stack and draw' techniques are used to produce anti-resonant hollow-core fibers, then the production process is relatively simple, but the manufacturing precision of anti-resonance element positioning and wall thickness uniformity deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-forming pressure chambers with precursors for anti-resonance elements at exact setpoint positions before the drawing process. The precursors are positioned in advance within the preform, ensuring precise final positioning when the pressure chambers are activated during fiber drawing. This eliminates the need for complex post-positioning adjustments.
Solution Approach 2:
The patent introduces pressure chambers as an intermediary mechanism between the preform structure and the final anti-resonance elements. These chambers act as mediators that, when pressurized, deform the preform material to create precisely positioned anti-resonance elements with uniform wall thickness, bridging the gap between simple stacking and high-precision formation.
2Manufacturing precision
If prefabricated preforms are positioned precisely to form anti-resonance elements, then the positioning accuracy improves, but the time and complexity of the production process increases
Solution Approach 1:
The patent merges the positioning function and the formation function into a single integrated process. The precursors for anti-resonance elements are incorporated into the preform structure during preform fabrication, and their final positioning and formation occur simultaneously when pressure chambers are activated during fiber drawing. This eliminates separate positioning and formation steps, reducing overall production time.
Solution Approach 2:
The patent applies self-service by designing the preform with self-positioning precursors that automatically assume their correct positions when pressure is applied to the chambers. The precursors are embedded in the preform material at locations that correspond to their final positions, eliminating the need for external positioning mechanisms or manual adjustment during the drawing process.
3Reliability
If complex internal geometries are formed in the preform, then the anti-resonance element structure improves, but the difficulty of detecting and measuring structural accuracy increases
Solution Approach 1:
The patent applies parameter changes by controlling the pressure and temperature parameters during the formation process to create consistent anti-resonance element structures. By carefully controlling these parameters, the complex internal geometries are formed with high repeatability, making them easier to measure and verify against design specifications.
Solution Approach 2:
The patent replaces complex mechanical positioning systems with a pressure-based formation mechanism. Instead of mechanically assembling complex geometries, the pressure chambers inflate or deform the preform material to create the desired structures. This substitution simplifies the measurement process, as pressure parameters can be precisely controlled and measured, providing indirect verification of structural 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
This approach enables the precise and reproducible production of anti-resonant hollow-core fibers with improved accuracy and reduced complexity, ensuring stable and reproducible structural elements and anti-resonance element positioning, overcoming the limitations of conventional production methods.
Implementation Method 1
applying a pressure acting from the outer side of the glass tube, thereby causing the softened material of the glass tube to bulge in the direction of its inner bore
Implementation Method 2
the formation of the anti-resonance element precursors comprises the formation of elongated pressure chambers... and heat, thereby forming an anti-resonance element or a precursor thereof
Data Source
AI summary
To achieve a high degree of precision and an exact positioning of anti-resonant elements in a sufficiently stable and reproducible manner in an anti-resonant hollow-core fiber which has a hollow core extending along a fiber longitudinal axis and an inner jacket region that surrounds the hollow core, formation of anti-resonant element precursors includes formation of elongated pressure chambers, each of which adjoins a wall deformable under pressure and heat in the region of target positions of the anti-resonant elements. A section of the deformable wall is caused to protrude in the direction of a cladding tube inner bore, thereby forming an anti-resonant element or a precursor for same, while carrying out a process of elongating a primary preform to form the hollow-core fiber or further processing the primary preform to a secondary preform from which the hollow-core fiber is drawn.