Multicore Fiber Preform Assembly for Cladding Circularity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing multicore fibers fail to suppress deviations in the outer shape of a multicore fiber from a circular shape.
Innovation Solution
A method for producing a multicore fiber, capable of producing a multicore fiber, capable of producing a multicore fiber, capable of suppressing a deviation of an outer shape of a clad from a circular shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If core rods are inserted into through holes of a cladding rod, then a multicore fiber can be produced, but a clearance is generated between the core rod and the inner wall of the through hole causing the outer shape of the clad to deviate from a circular shape
Solution Approach 1:
The patent applies preliminary action by pre-determining the optimal combination of core rods and through holes before insertion. The determination step calculates which core rod should be inserted into which through hole based on minimizing clearance, and this predetermined assignment is then executed in the insertion step, ensuring minimal clearance before the crushing process occurs.
Solution Approach 2:
The patent applies parameter changes by optimizing the clearance parameter through mathematical calculation. The determination step computes the sum of clearances for different combinations and selects the combination that minimizes this sum, thereby controlling the clearance parameter to achieve the best possible circularity after crushing.
2Ease of operation
If the clearance between core rod and through hole is large, then insertion is easier, but the outer peripheral surface of the cladding rod moves inward more during crushing causing greater deviation from circular shape
Solution Approach 1:
The patent optimizes the clearance parameter by calculating the sum of clearances for each set of through holes and minimizing the residual sum of squares. This mathematical optimization ensures that clearances are neither too large (which would cause excessive inward movement) nor too small (which would make insertion difficult), achieving a balanced optimal value.
Solution Approach 2:
The patent creates a mathematical model (clearance calculation) that copies the physical relationship between core rod diameter and through hole diameter. By working with this mathematical representation, the system can determine optimal combinations without physically testing each combination, thereby finding the best clearance values efficiently.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A method for producing a base material (1P) for a multicore fiber includes: a preparation step (P1) of preparing a plurality of core rods (10P) and a cladding rod (20P) in which four or more even-numbered through holes (20PH) formed on a periphery (20PC) are positioned so as to form a plurality of sets (PA1) and (PA2) in each of which the through holes (20PH) are aligned in a radial direction; a determination step (P3) of determining a combination of the core rod (10P) and the through hole (20PH) such that in a case where the core rod (10P) is inserted into the through hole (20PH), when a sum of clearances between the core rod (10P) and an inner wall of the through hole (20PH) is taken for each of the sets (PA1) and (PA2), a residual sum of squares of each of the sums is minimized; and an insertion step (P4) of inserting the core rods (10P) into the respective through holes (20PH) in the determined combination of the core rods (10P) and the through hole (20PH).