Hollow-Core Fiber Ferrule Sealing for Low-Loss Optical Coupling
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Solution Overview
Problem
Existing termination processes for hollow-core optical fibers are inadequate due to structural differences, leading to contamination and high insertion losses, and current sealing methods are complex and costly, making them unsuitable for high-volume applications.
Innovation Solution
A system and method for coupling hollow-core optical fibers using fiber optic connectors with integrated seals, such as face seals, shaft seals, and O-ring seals, to isolate the fiber end faces from the external environment, preventing contamination and reducing insertion losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hollow-core optical fiber end face is polished using traditional processes, then surface quality is improved, but the hollow core becomes contaminated by particles causing excess optical loss
Solution Approach 1:
The patent extracts the harmful polishing process from the manufacturing sequence by implementing a break-before-mate mechanism that prevents contact between the fiber end face and mating surfaces during assembly, eliminating the need for traditional polishing while avoiding contamination
Solution Approach 2:
The patent introduces an intermediary air gap between the fiber end face and mating components, which acts as a protective barrier preventing direct contact and potential contamination while still allowing optical coupling through the gap
2Reliability
If liquids contact the hollow-core optical fiber end face, then capillary wicking occurs causing nonfunctional light guiding, but sealing the end face hermetically increases device complexity
Solution Approach 1:
The patent employs a flexible dust cap with integrated sealing features that can be easily applied and removed, providing liquid protection without the complexity of permanent hermetic seals while maintaining light guiding functionality
Solution Approach 2:
The patent implements preliminary protective measures by designing the connector housing and dust cap to prevent liquid contact before it can reach the fiber end face, eliminating the need for complex post-contact sealing mechanisms
3Ease of manufacture
If standard ferrules are used to terminate hollow-core optical fibers, then connectorization is simplified, but the hollow cores remain exposed to dust and moisture
Solution Approach 1:
The patent designs the ferrule structure to serve multiple functions: mechanical support, alignment, and integrated sealing through the dust cap interface, eliminating the need for separate sealing components while maintaining ease of manufacture
Solution Approach 2:
The patent merges the sealing function with the existing ferrule and dust cap structures by implementing sealing features at the interface between these components, protecting the hollow core without adding separate complex sealing mechanisms
4Reliability
If hardened connectors with weather resistant features are used, then moisture resistance is improved, but the connector size becomes too bulky for high density data center environments
Solution Approach 1:
The patent applies sealing features only at the critical interface where the dust cap meets the connector housing, providing moisture resistance only where needed rather than throughout the entire connector structure, thus maintaining compact size
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 system provides a simpler, reliable, and cost-effective solution for connecting hollow-core optical fibers with low insertion losses and high reliability, suitable for large-scale deployment in data centers.
Implementation Method 1
any liquids coming into contact with the end face of a hollow-core optical fiber could wick into core over a significant length of the fiber though the capillary effect
Data Source
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AI summary
A method and system for coupling hollow-core optical fibers. The fiber optic coupling system includes one or more fiber optic connectors, and each of the fiber optic connectors includes a ferrule, a hollow-core optical fiber, and one or more seals. Each ferrule includes an end face, an outer surface that defines a center axis of the ferrule, and a bore with an opening on the end face. Each hollow-core optical fiber is positioned in the bore of a respective ferrule, and each of the one or more seals are operatively coupled to the ferrule and configured to form a sealing interface that isolates the opening of the bore from an external environment when the fiber optic connector is operatively coupled to another component of the system.