Multi-Core Fiber Rotational Clocking for Connector Alignment
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Solution Overview
Problem
The increasing demand for higher data rates in communications networks requires efficient methods for connectorizing multi-core fiber optic cables, which pose challenges due to the need for precise alignment of multiple cores to minimize signal loss and maintain polarity, especially as conventional connectors are designed for single-mode fibers and lack rotational alignment capabilities.
Innovation Solution
The use of fiber rotational clocking techniques to align radial satellite cores of multi-core optical fibers relative to fixed points on connectors, such as keyways, and transitioning from loose tube cables to ribbonized configurations within connectors, which simplifies connectorization and reduces signal loss by ensuring precise angular alignment and polarity maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional connectors designed for single-mode fibers are used, then connectorization is straightforward, but precise alignment of multiple cores cannot be achieved leading to signal loss
Solution Approach 1:
The connector is segmented into multiple independent alignment features (keyways, alignment pins, registration features) that each handle specific alignment tasks for different cores. This allows complex multi-core alignment to be broken down into manageable discrete elements rather than requiring a completely new connector design.
Solution Approach 2:
The invention adds rotational alignment capability (angular dimension) to the conventional linear alignment approach. By incorporating keyways and rotational registration features, the connector can control the angular position of multi-core fibers, enabling precise alignment of multiple cores in addition to the standard lateral and axial alignment.
2Manufacturing precision
If fiber rotational clocking techniques are implemented, then satellite cores can be aligned relative to fixed points, but the connectorization process becomes more complex
Solution Approach 1:
Alignment features such as keyways and registration marks are pre-formed on the connector components during manufacturing. This preliminary preparation eliminates the need for complex real-time alignment procedures during field installation, as the rotational positioning is predetermined and mechanically enforced by the pre-formed features.
Solution Approach 2:
Alignment pins and keyways serve as intermediary elements that mediate between the multi-core fiber and the connector housing. These intermediaries provide mechanical reference surfaces that simplify the alignment process by converting the complex task of aligning multiple cores into a simpler task of engaging the intermediary alignment features.
3Ease of operation
If loose tube cables are transitioned to ribbonized configurations, then connectorization is simplified, but cable flexibility may be reduced
Solution Approach 1:
The cable is divided into distinct sections: a flexible loose tube section for cable routing and installation, and a rigid ribbonized section for connectorization. This segmentation allows each section to be optimized for its specific function - the loose tube portion maintains flexibility while the ribbonized portion enables precise alignment.
Solution Approach 2:
A transition section or intermediary structure connects the loose tube cable to the ribbonized fiber array. This intermediary element facilitates the transformation from the flexible loose tube configuration to the rigid ribbon configuration, allowing the cable to maintain flexibility in the loose tube section while enabling precise alignment in the ribbonized section.
Data Source
AI summary
A connector with at least one multi-core fiber (MCF) and method of attaching the MCF within the connector, includes inserting a first end of a MCF into a ferrule of a connector. Then, rotating the end of the MCF within the ferrule until a first selected satellite core of the MCF is in a first alignment relative to a feature of the connector. The feature may be a mark, indentation or protrusion formed on a ferrule, ferrule holder or connector envelope. Finally, affixing the MCF within the ferrule of the connector. In the case of an array-type connector, first ends of other MCFs may be added to the ferrule and clocked relative to the same feature of the connector. Second ends of one or more MCFs may be clocked relative to a same feature of a second connector.