Preform Element Slot for Microstructured Optical Fiber Pressure Control
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Solution Overview
Problem
Existing methods for producing microstructured optical fibers are complex, costly, and prone to damage during the production of pressure control slots, leading to inefficiencies and waste in the manufacturing process.
Innovation Solution
A preform element with a slot that intersects longitudinal holes, allowing for precise pressure control during fiber drawing, is used to simplify and cost-effectively produce microstructured optical fibers, enabling separate production and handling of preform elements to reduce damage and increase design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pressure control slots are produced during preform manufacturing, then hole diameter control during fiber drawing is improved, but the complexity and cost of the manufacturing process increases
Solution Approach 1:
The preform is divided into multiple separate canes (capillaries with holes, solid rods, etc.) that are stacked to form the complete preform structure. This segmentation allows each cane to be manufactured independently with pre-formed holes, eliminating the need to produce complex pressure control slots during preform manufacturing. The holes in each cane can be individually addressed with pressure control through simple end-closed or open configurations.
Solution Approach 2:
The holes in the capillary canes are prepared in advance during cane manufacturing, with their sizes and positions predetermined. The canes are stacked with pre-planned configurations (open-ended or end-closed) that will provide pressure control functionality during fiber drawing. This preliminary preparation of hole structures eliminates the need for complex slot cutting operations during preform manufacturing.
2Manufacturing precision
If pressure control slots are produced during preform manufacturing, then hole size control during drawing is improved, but the risk of damage and waste increases
Solution Approach 1:
By dividing the preform into separate canes with pre-formed holes, the manufacturing process avoids the high-risk slot cutting operation that could damage the entire preform. If damage occurs during cane manufacturing, only that specific cane is affected, not the entire preform assembly. This segmentation significantly reduces waste and loss.
Solution Approach 2:
The hole structures are created in advance during cane manufacturing under controlled conditions, rather than attempting to cut slots into the completed preform. This preliminary formation of holes with precise dimensions eliminates the risk of damaging the preform during slot production, as the holes are already present in the constituent canes before stacking.
3Manufacturing precision
If individual hole pressure control is implemented, then fiber structure control is improved, but the manufacturing cost increases
Solution Approach 1:
The preform is segmented into multiple canes, where each cane contains one or more holes that can be independently controlled. By making each cane a separate manufacturable unit with its own hole configuration, the system enables individual pressure control for each hole or group of holes through simple open-ended or end-closed designs, avoiding complex integrated pressure control systems.
Solution Approach 2:
The cane structure acts as an intermediary that provides simple pressure control functionality. By making cane ends open or closed, pressure can be applied or contained in a straightforward manner during fiber drawing. This intermediary structure translates simple manufacturing choices (open/closed ends) into effective pressure control mechanisms for individual holes.
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 simplifies the production of microstructured optical fibers, reduces waste, and allows for accurate control of hole diameters, enhancing the economic and technical feasibility of fiber manufacturing.
Implementation Method 1
The slot is adapted for providing pressure control within the one or more longitudinal holes
Implementation Method 2
drawing the fiber from the preform at a suitable temperature ensuring that the material of the preform is sufficiently soft while not fully melted
Data Source
AI summary
A preform element, its production, and fiber production methods from preform assemblies. The preform element has a length and a center axis along its length, a first and second end defined by its length and an outer preform element surface. The preform element includes a plurality of longitudinal structures disposed to form longitudinal hole(s) in a background material. At least one slot extending from its outer preform element surface and intersecting at least one of the longitudinal holes, wherein the at least one slot does not fully intersect the preform element. The preform element may be a preform center element or a preform ring element and may be assembled to a form part of a preform assembly for an optical fiber.