Multicore Optical Fiber Marker Positioning for Bubble Suppression
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Solution Overview
Problem
In multicore optical fibers, structural abnormalities such as air bubbles can occur at the interface between the marker and the cladding during the manufacturing process due to non-uniform temperature and internal stress, especially when the element arrangement lacks rotational symmetry.
Innovation Solution
A multicore optical fiber structure with a resin coating is introduced, where the centers of the cores and the marker form a plane figure with rotational symmetry of order 1, ensuring uniform temperature and stress control during the collapse process, and the marker is positioned on a circle passing through the core centers, reducing bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the marker is disposed outside the circumference of the circle passing through core centers, then core identification is improved, but structural abnormality such as bubbles occurs at the marker-cladding interface
Solution Approach 1:
The patent applies asymmetry by intentionally breaking the rotational symmetry of the element arrangement. Specifically, the marker is positioned at a location that does not satisfy rotational symmetry conditions, creating an asymmetric configuration that prevents bubble formation while maintaining core identification capability. The asymmetry ensures that the marker does not create uniform stress distribution that would lead to bubble formation at the marker-cladding interface.
Solution Approach 2:
The patent applies local quality by optimizing the marker position specifically to prevent bubble formation at the marker-cladding interface. The marker is positioned at a location where it provides sufficient contrast for core identification while avoiding regions prone to structural abnormalities. This localized optimization ensures that the marker serves its identification function without causing manufacturing defects.
2Measurement precision
If rotational symmetry is broken by the marker arrangement, then core identification is improved, but temperature and internal stress become non-uniform during manufacturing
Solution Approach 1:
The patent applies asymmetry by intentionally breaking the rotational symmetry of the element arrangement. Specifically, the marker is positioned at a location that does not satisfy rotational symmetry conditions, creating an asymmetric configuration that prevents bubble formation while maintaining core identification capability. The asymmetry ensures that the marker does not create uniform stress distribution that would lead to bubble formation at the marker-cladding interface.
3Manufacturing precision
If the marker is positioned to prevent bubbles, then manufacturing quality is improved, but core identification capability may be reduced
Solution Approach 1:
The patent applies local quality by optimizing the marker position specifically to prevent bubble formation at the marker-cladding interface. The marker is positioned at a location where it provides sufficient contrast for core identification while avoiding regions prone to structural abnormalities. This localized optimization ensures that the marker serves its identification function without causing manufacturing defects.
Data Source
AI summary
The MCF of the present disclosure suppresses occurrence of structural abnormality such as air bubbles in the vicinity of a boundary between a marker and a cladding. The MCF includes a glass optical fiber including a plurality of cores, a marker, and a cladding, and a resin coating. On a cross section of the MCF, centers of the plurality of cores and a center of the marker constitute a plane figure having a rotational symmetry of order 1 with respect to a center of the cross section. Moreover, on the cross section, the marker is disposed so as to be located on a circumference of a circle having a center coinciding with the center of the cross section and having the circumference passing through the respective centers of the plurality of cores.