Multi-core optical fiber microbend crosstalk suppression
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Solution Overview
Problem
Conventional multi-core optical fibers face challenges in reducing crosstalk, which is difficult to address without increasing costs, especially when applying appropriate bends to already laid fibers.
Innovation Solution
Incorporating a microbend applying portion on the outer periphery of the multi-core optical fiber, which applies a microscopic bend to increase the difference in propagation constants between core portions, thereby reducing crosstalk without the need for additional bending mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If appropriate bending is applied to reduce crosstalk in multi-core optical fiber, then crosstalk is reduced, but device complexity and cost increase due to requiring bending mechanisms
Solution Approach 1:
The microbend applying portion is incorporated into the optical fiber structure during manufacturing, preliminarily applying microscopic bends to the core portions before deployment. This eliminates the need for complex bending mechanisms during operation, as the crosstalk reduction structure is already in place from the outset
Solution Approach 2:
The optical fiber structure itself provides the crosstalk reduction function through its built-in microbend applying portion, making the system self-sufficient. The fiber does not require external bending mechanisms or active control systems to achieve crosstalk suppression
2Object-generated harmful factors
If appropriate bending is applied to reduce crosstalk in multi-core optical fiber, then crosstalk is reduced, but manufacturing cost increases
Solution Approach 1:
The microbend applying portion is formed during the optical fiber manufacturing process itself, integrating the crosstalk reduction feature into the base production line. This approach is more cost-effective than deploying complex bending mechanisms after the fiber is already laid
Solution Approach 2:
The invention changes the physical parameters of the optical fiber structure by introducing controlled microscopic bends at specific locations. This structural modification achieves crosstalk reduction through geometric parameter changes rather than requiring expensive active bending mechanisms
3Productivity
If core pitch between neighboring core portions is reduced to increase core density, then information transmission capacity increases, but crosstalk between cores increases
Solution Approach 1:
The microbend applying portion is positioned specifically between neighboring core portions, creating localized structural variations at critical interfaces. This local modification reduces crosstalk at specific core boundaries while maintaining close spacing, enabling high core density without sacrificing signal isolation
Solution Approach 2:
By introducing controlled microbends that modify the local geometric parameters between cores, the invention achieves crosstalk reduction even when core pitch is minimized. The parameter changes in the inter-core regions allow dense packing while maintaining signal integrity
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 effectively suppresses crosstalk on an easy and inexpensive basis, allowing for longer transmission distances and increased core density, enabling higher information volume transmission.
Implementation Method 1
Incorporating a microbend applying portion on the outer periphery of the multi-core optical fiber, which applies a microscopic bend to increase the difference in propagation constants between core portions
Data Source
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AI summary
The present invention relates to a multi-core optical fiber that can realize suppression of crosstalk on an easy and inexpensive basis. The multi-core optical fiber is provided with a plurality of core portions extending along a central axis of the fiber, a common cladding portion integrally holding the core portions inside, a coating layer surrounding the common cladding portion, and a bend applying portion. The bend applying portion, as an example, is provided on a partial region of an outer periphery of the coating layer and applies bending stress to a glass region.