Multicore Optical Fiber Preform Consolidation
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Solution Overview
Problem
Current methods for producing multicore optical fibers often result in flaws near the glass core cane surface due to consolidation stresses, limiting the quality of the fibers produced.
Innovation Solution
The method involves forming a silica-based soot blank with a soot core cane that has an unconsolidated or partially consolidated inner and outer portion, with the core cane's density within 10% of the soot blank's density, allowing for consolidation to form a preform which is then drawn into an optical fiber, reducing flaws and improving production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If glass core canes are positioned in soot blanks and consolidated to form preforms, then multicore optical fibers can be produced, but flaws are frequently present near the glass core cane surface following consolidation
Solution Approach 1:
The patent changes the physical state parameter of the core cane from fully consolidated (solid glass) to unconsolidated or partially consolidated (soot-like material). This parameter change allows the core cane to be more compliant during consolidation, reducing stress-induced flaws while maintaining the ability to form the desired preform structure.
Solution Approach 2:
The patent applies different consolidation states to different parts of the preform structure: the core cane remains unconsolidated or partially consolidated, while the surrounding soot blank is consolidated. This local quality differentiation allows the core region to accommodate consolidation stresses without developing surface flaws.
2Reliability
If core canes are made with unconsolidated or partially consolidated portions, then consolidation stresses are reduced and flaws are minimized, but the manufacturing process becomes more complex
Solution Approach 1:
The patent merges the core cane material with the soot blank material by using the same unconsolidated or partially consolidated soot material for both. This material unity simplifies the consolidation process, as both components respond similarly to consolidation stresses, reducing process complexity despite the unusual core cane structure.
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 reduces flaws in multicore optical fibers by minimizing stress-induced defects during consolidation and provides an economic and scalable production method for high-quality fibers.
Implementation Method 1
The soot blank with the at least one soot core cane positioned therein is consolidated to form a preform
Data Source
Figure 1A~1B
Figure 2~3
Figure 4~5
AI summary
A method of forming an optical fiber includes the steps of forming a silica-based soot blank with at least one silica-based soot core cane at least partially embedded in the soot blank. The soot blank with the soot core cane positioned therein is consolidated to form a preform. The preform is then drawn to form an optical fiber. The soot core cane preferably has an average bulk density within 10% of the bulk density of the soot blank, and more preferably within 5% of the bulk density of the soot blank.