Multicore Optical Fiber Noncircular Cross-Section Alignment
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Solution Overview
Problem
Conventional multicore optical fibers with circular cross-sections require time-consuming rotational alignment during connection, and existing methods for producing fibers with noncircular cross-sections face challenges in accurately measuring core positions, leading to potential misalignment and prolonged alignment processes.
Innovation Solution
A method involving glass rod machining to create a flat surface, drilling core rod insertion holes, integrating core rods with a common cladding, detecting the outline of the core-cladding composite body, and machining the optical fiber preform to produce multicore optical fibers with noncircular cross-sections, allowing for easier rotational alignment by using flat surfaces as references.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a circular cross-sectional shape is used for MCF, then manufacturing is simpler, but rotational alignment becomes time-consuming
Solution Approach 1:
The patent applies asymmetry by changing the MCF cross-sectional shape from circular to noncircular (e.g., rectangular, elliptical, or triangular). This asymmetric shape provides unique alignment references that eliminate the need for time-consuming rotational alignment operations, as the noncircular shape can only be oriented in specific directions.
2Loss of time
If a noncircular cross-sectional shape is used for MCF, then rotational alignment is simplified, but measurement precision of core positions becomes difficult
Solution Approach 1:
The patent applies preliminary action by pre-forming the noncircular cross-sectional shape during the MCF manufacturing process itself, rather than attempting to measure and correct core positions after fabrication. The shape formation occurs during preform creation or drawing, ensuring inherent alignment references are built into the structure before deployment.
Solution Approach 2:
The patent introduces an intermediary approach by using the noncircular outer shape as an indirect reference for core positioning. Instead of directly measuring core positions, the unique external geometry serves as a mediator that indirectly indicates the correct alignment orientation, simplifying the measurement process.
3Measurement precision
If the outer circumferential surface is ground to form a flat surface, then alignment reference is provided, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by forming the flat surface or noncircular shape during the preform fabrication or fiber drawing process, rather than performing separate post-manufacturing grinding operations. This integrates the alignment reference creation into the existing manufacturing flow, minimizing additional process 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
The method reduces misalignment and simplifies the rotational alignment process by enabling accurate detection and machining of noncircular cross-sectional shapes, facilitating quicker and more precise connection of multicore optical fibers.
Implementation Method 1
an integrating step of heating the common cladding and the core rods, thereby integrating the common cladding tube with the core rods
Implementation Method 2
a drawing step of drawing one end of the optical fiber preform under heating to obtain the MCF
Data Source
AI summary
Provided is a method for producing a multicore optical fiber (MCF) in which variations in positions of cores relative to the outer shape of the MCF are small. The method includes: an integrating step of heating a common cladding tube and a core rods, thereby integrating the tube with the core rods to form a core-cladding composite body including a plurality of cores and a common cladding and having a noncircular cross-sectional shape; an outline detecting step of detecting the outline of the composite body; an optical fiber preform forming step of machining the outer circumferential surface of the composite body using results obtained in the outline detecting step to form the preform having a flat surface; and a drawing step of drawing one end of the preform under heating to obtain the MCF. Also provided is a MCF for which a rotation alignment operation is easily performed.