Multi-Core Optical Fiber Preform for Coating Asymmetry Detection
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Solution Overview
Problem
Accurate confirmation of coating layer asymmetry in multi-core optical fibers is difficult due to light scattering from multiple cores, which complicates the production process.
Innovation Solution
A multi-core optical fiber preform design with a tip continuously-installed portion having no core rods or one core rod, allowing for the production of coated wires with reduced core count, enabling asymmetry confirmation under minimal light scattering conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple core rods are inserted into the main inner holes to form multi-core optical fiber, then the transmission capacity is increased, but the light scattering from multiple cores makes it difficult to accurately confirm coating layer asymmetry
Solution Approach 1:
The preform is divided into two distinct parts: a main body portion containing multiple core rods for high transmission capacity, and a tip portion containing only one core rod or no core rod for accurate asymmetry measurement. This segmentation allows each part to serve its specific function without interference from the other.
Solution Approach 2:
The tip portion is extracted from the multi-core structure, removing the additional core rods that cause light scattering during asymmetry measurement. This extraction creates a simplified single-core or bare structure at the tip, enabling clear detection of coating layer asymmetry while the main body retains the multi-core configuration for high transmission capacity.
2Measurement precision
If a tip continuously-installed portion with no core rod or one core rod is provided, then the asymmetry of coating layer can be accurately confirmed, but the structure becomes more complex
Solution Approach 1:
The tip continuously-installed portion serves multiple functions: it provides a simplified structure for asymmetry measurement, acts as a protective element during handling, and can be used for single-core fiber production if needed. This multi-functionality justifies the additional structural element despite the increased complexity.
Solution Approach 2:
The tip continuously-installed portion is pre-configured with a simplified structure (one core rod or none) before the actual asymmetry measurement process. This preliminary preparation ensures that the measurement can be performed accurately without requiring complex modifications during the measurement process itself.
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
Enables accurate confirmation of coating layer asymmetry by reducing light scattering, thereby improving production efficiency and accuracy of multi-core optical fibers.
Implementation Method 1
the positions of brightness and darkness in the forward scattered light are affected by the thickness distribution of the coating layer
Implementation Method 2
The asymmetry in coating layers can be confirmed by forward scattered light obtained by irradiating a side surface of the optical fiber with laser light
Data Source
AI summary
A multi-core optical fiber preform includes: a rod-shaped main cladding body having one or more main inner holes; main core rods inserted into the one or more main inner holes; and a tip continuously-installed portion disposed at one end of the rod-shaped main cladding body and including a glass rod having no core rod or having one core rod.