Hardened Multi-Fiber Optical Ferrule with Segmented Buckling Chambers
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Solution Overview
Problem
Current fiber optic connectors face challenges in efficiently aligning and securely connecting multiple optical fibers over long distances while maintaining environmental sealing and robustness, particularly in high-bandwidth communication systems.
Innovation Solution
The development of an optical ferrule with a ferrule body that extends from one end to another, featuring alignment openings and channels to securely anchor and align multiple optical fibers, along with a multi-fiber connector that includes a ferrule body with alignment elements and environmental sealing mechanisms such as radial and axial seals, twist-to-lock fasteners, and a hardened connector design for robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a standard MPO connector design is used to terminate multiple optical fibers, then the connector can accommodate up to 24 fibers, but it becomes difficult to efficiently align and securely connect a higher number of fibers (e.g., 144 fibers) while maintaining environmental sealing and robustness
Solution Approach 1:
The ferrule body is segmented into multiple sections, each containing a subset of alignment openings (e.g., 12 openings per section arranged in 3 rows of 4). This segmentation allows the large number of fibers to be organized into manageable groups while maintaining precise alignment capability for each section, thereby resolving the contradiction between handling high fiber counts and maintaining alignment precision.
Solution Approach 2:
The connector employs a nested structure where the ferrule body with alignment openings is inserted into the connector body, which in turn is inserted into a receptacle. Environmental seals are nested at multiple levels (between ferrule and connector body, between connector body and receptacle). This nested design enables robust environmental sealing while accommodating the complex alignment structure needed for high fiber counts.
2Strength
If the connector body is made robust to withstand axial loads and provide environmental sealing, then the connector gains hardness and protection, but the complexity of the connector structure increases
Solution Approach 1:
The connector body integrates multiple functions into a single component: it provides structural support for the ferrule, houses environmental seals, contains alignment features, and withstands axial loads. By merging these functions into one robust component rather than using separate elements, the design achieves high strength and environmental protection while controlling overall structural complexity.
Solution Approach 2:
The connector body is made from a composite material comprising a thermoplastic polymer matrix reinforced with glass fibers. This composite structure provides the necessary mechanical strength to withstand axial loads while maintaining manufacturability and controlling complexity through a single-material solution that combines multiple properties.
3Measurement precision
If alignment openings are made small to achieve precise fiber alignment (cross-dimension no more than 81 μm), then alignment precision improves, but the difficulty of manufacturing and inspecting these openings increases
Solution Approach 1:
The alignment openings exhibit local quality variations: they have a small cross-dimension (no more than 81 μm) at the fiber interface for precise alignment, but their length extends deeper into the ferrule body to provide adequate fiber insertion depth. This localized differentiation of dimensions allows precise alignment at the critical interface while maintaining manufacturability through the extended length that provides tolerance compensation.
Data Source
AI summary
A multi-fiber cable assembly includes an optical connector and a cable. The optical connector includes a connector body; an optical ferrule body, and alignment elements. The optical ferrule body has an end face defining a plurality of alignment openings arranged in rows and has a plurality of buckling chambers. Each buckling chamber is aligned with one of the rows of the alignment openings. The optical fibers of the cable have bare portions secured at a first end of the optical ferrule body using rigid epoxy. Each of the optical fibers is routed through one of the buckling chambers to one of the alignment holes.