Rolled-Glass Hollow-Core Fiber Preforms for Precise Cladding Layout
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Solution Overview
Problem
Manufacturing hollow-core optical fibers with capillaries as cladding elements is challenging due to difficulties in precisely placing multiple capillaries within a preform and limited structural flexibility.
Innovation Solution
A method involving rolling a glass sheet to form a rolled-glass structure, attaching it to an annular support structure to create a hollow-core preform, and drawing it into a fiber, which allows for greater structural flexibility and precise placement of rolled-glass structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If capillaries are used as cladding elements in hollow-core optical fibers, then light transmission through hollow core is achieved, but manufacturing precision and placement accuracy deteriorate due to difficulty in precisely placing multiple capillaries within preform
Solution Approach 1:
The invention extracts the capillary elements from the traditional multi-capillary arrangement and replaces them with a single continuous rolled-glass structure. This eliminates the need to precisely place multiple separate capillaries within the preform, while still achieving the required light confinement through the rolled-glass cladding structure.
Solution Approach 2:
The invention merges multiple separate capillary elements into a single continuous rolled-glass structure. By rolling the glass sheet into a spiral configuration, multiple cladding functions are combined into one integrated element, simplifying the manufacturing process and eliminating placement precision issues.
2Shape
If capillaries are used as cladding elements, then hollow-core optical fiber structure is formed, but device complexity increases due to limited structural possibilities and manufacturing difficulties
Solution Approach 1:
The rolled-glass structure is prepared in advance by rolling a glass sheet into a spiral configuration before being integrated into the preform. This preliminary formation of the cladding structure simplifies the overall manufacturing process, as the complex spiral geometry is created once during glass sheet processing rather than during preform assembly.
Solution Approach 2:
The invention changes the physical state and form of the cladding material from discrete capillary tubes to a continuous rolled-glass structure. This parameter change in the cladding element geometry enables new manufacturing approaches using glass sheet rolling and drawing processes, reducing device complexity.
3Reliability
If traditional capillary structures are used, then cladding function is achieved, but adaptability deteriorates due to limited structural possibilities
Solution Approach 1:
The rolled-glass structure can be manufactured with varying spiral parameters such as pitch, radius, and number of turns, allowing dynamic adjustment of cladding properties. This enables adaptation to different optical requirements and fiber designs while maintaining the essential light confinement function.
Solution Approach 2:
The rolled-glass cladding structure serves multiple functions: it provides light confinement through its spiral geometry, maintains the hollow-core structure, and can be integrated with various glass sheet configurations. This universal structure can accommodate different design requirements, enhancing adaptability.
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 production of hollow-core optical fibers with improved structural flexibility and reduced complexity, enhancing light confinement and reducing attenuation through anti-resonant effects.
Implementation Method 1
enhancing light confinement in the hollow core through anti-resonant effects
Data Source
AI summary
A method for producing a hollow-core preform may include rolling a glass sheet to form a rolled-glass structure; and attaching one or more of the rolled-glass structures to an inner surface of an annular support structure to form a hollow-core preform, wherein the inner surface of the annular support structure defines an interior cavity and the one or more of the rolled-glass structures are positioned within the interior cavity. The hollow-core preform may be drawn into a hollow-core optical fiber.