Twisted Multi-Core Fiber Splicing Alignment
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Solution Overview
Problem
Existing fusion splicers struggle to accurately align twisted multiple core fibers, leading to unacceptable signal attenuation due to misalignment of cores at the fiber end faces, as the brightness profiles measured at offset positions do not accurately reflect the alignment at the end faces.
Innovation Solution
The method involves positioning the fibers for axial alignment, obtaining side view images and brightness profiles at known offset positions, and rotating the fibers about their axes to compensate for additional core twist from the offset positions to the end faces, ensuring optimal alignment before fusion splicing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If brightness profiles are measured at offset positions from the end faces, then optical noise and end face quality issues are avoided, but core alignment accuracy at the end faces deteriorates due to additional core twist
Solution Approach 1:
The patent calculates and applies a compensating rotation angle before the actual splicing operation. This preliminary rotational adjustment pre-compensates for the core twist that occurs between the offset measurement position and the end face, ensuring that when the fibers are spliced, the cores are properly aligned despite the twist. The rotation angle is determined based on the measured brightness profiles and the known twist rate of the fiber.
Solution Approach 2:
The patent changes the angular orientation parameter of the fiber cores by applying a rotational transformation. The system calculates a compensating rotation angle θ based on the twist rate and offset distance, then rotates the fiber ends accordingly before splicing. This parameter change (angular orientation) corrects the misalignment caused by the core twist, enabling accurate core-to-core alignment at the splicing point.
2Device complexity
If conventional PAS splicers are used for twisted multiple core fibers, then device complexity is reduced, but signal attenuation increases due to misalignment
Solution Approach 1:
The patent enables the conventional PAS splicer to self-adjust for twisted fibers by incorporating an automated rotational alignment mechanism. The system automatically calculates the required compensating rotation based on the brightness profile measurements and applies it to align the cores correctly. This self-service capability allows standard equipment to handle twisted fibers without requiring complex specialized hardware, thereby reducing overall system complexity while minimizing signal attenuation.
3Device complexity
If manual alignment methods are used, then device complexity is reduced, but alignment precision deteriorates and time consumption increases
Solution Approach 1:
The patent implements a feedback-based automated alignment system that uses brightness profile measurements to determine the optimal rotational alignment. The system measures the brightness profiles at offset positions, calculates the compensating rotation angle based on the measured data and known twist rate, and automatically rotates the fiber ends to the correct orientation. This closed-loop feedback mechanism eliminates manual alignment, providing both high precision and reduced time consumption while maintaining acceptable device complexity.
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 achieves a strong physical joint between the fibers with negligible signal loss, improving the splicing of twisted multiple core fibers by compensating for core twist, thereby reducing attenuation.
Implementation Method 1
The end faces of the fibers are advanced (Z-direction) to abut one another, and the fibers including their cores are fused together by an electric arc discharge.
Implementation Method 2
two cameras are positioned to produce two side view images of a confronting end region of each fiber
Data Source
AI summary
A method of coupling optical fibers containing cores or other structures that twist about the axis of one or both fibers. The fiber end faces are aligned axially to confront one another, and side view images of end regions of the fibers including the contained cores or structures are produced. For each fiber, a brightness profile of a side view image is obtained at an axially offset position from the fiber end face. One or both fibers are rotated about their axes until the brightness profiles for each fiber indicate certain cores or structures in the fibers are aligned. For each fiber, an additional amount of twist from the offset position to the fiber end face is determined. One or both fibers are rotated again to compensate for the additional twist in each fiber, so that the fibers are aligned optimally when coupled.