Microstructured Fiber Bend Resistance
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Solution Overview
Problem
Conventional fiber optic cables and assemblies face limitations in flexibility, manageability, and durability due to the physical characteristics of optical fibers, particularly in outdoor and indoor installations, where they often suffer from high optical attenuation and breakage when subjected to aggressive bending.
Innovation Solution
The development of microstructured optical fibers with a core region and a cladding region containing non-periodically disposed holes, allowing for reduced component size, tighter bend radius tolerances, and maintaining single mode transmission capabilities, which are integrated into fiber optic cables and jumper assemblies to enhance flexibility and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical fibers are used in fiber optic cables, then the cables can maintain standard transmission performance, but the cables suffer from high optical attenuation and breakage when subjected to aggressive bending
Solution Approach 1:
The patent applies parameter changes by modifying the physical and structural parameters of the optical fiber itself. Specifically, it uses microstructured optical fibers with non-periodically disposed holes in the cladding region, which changes the optical path and stress distribution parameters to reduce bend-induced attenuation and prevent breakage during aggressive bending operations
Solution Approach 2:
The patent employs composite materials by combining the optical core with a microstructured cladding containing non-periodically disposed holes. This composite structure provides both the optical transmission functionality and the mechanical flexibility needed to withstand aggressive bending without excessive attenuation or breakage
2Volume of moving object
If conventional optical fibers are used, then the assembly structure is simplified, but the component size cannot be reduced and bend radius tolerances are loose
Solution Approach 1:
The patent changes the structural parameters of the optical fiber to enable smaller component sizes and tighter bend radii. The microstructured cladding with non-periodically disposed holes allows the fiber to maintain optical performance in compact configurations with reduced bend radius tolerances, enabling miniaturization of fiber optic components
Solution Approach 2:
The patent introduces complexity in the cross-sectional dimension of the fiber structure (non-periodic hole pattern in the cladding) to enable improvements in the longitudinal dimension (tighter bend radius, smaller component size). This dimensional trade-off allows compact packaging while maintaining performance
3Ease of operation
If conventional optical fibers are used, then manufacturing processes are straightforward, but fiber routing and handling requirements are stringent
Solution Approach 1:
The patent modifies the mechanical and optical parameters of the fiber through microstructuring the cladding. This creates a fiber that is inherently more flexible and tolerant of routing variations, reducing the stringency of handling requirements while maintaining manufacturability through established microstructured fiber fabrication processes
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
These microstructured optical fibers enable fiber optic cables and jumper assemblies to withstand aggressive bending without significant optical attenuation, improving installation ease and durability, and reducing the risk of breakage, while maintaining low macrobend-induced loss.
Implementation Method 1
the cladding region comprising an annular hole-containing region comprised of non-periodically disposed holes... such that the optical fiber is capable of single mode transmission
Data Source
AI summary
A fiber optic drop cable includes an optical fiber, a tight buffer layer on the optical fiber, at least one strength member, and a jacket surrounding the tight buffer layer. The jacket is coupled to the at least one strength member by at least partial embedment of at least one of the strength members in the jacket, which facilitates coupling between the jacket and strength member. The fiber optic drop cable has an average delta attenuation of 0.4 dB or less at a reference wavelength of 1625 nanometers with the fiber optic cable wrapped 2 turns about a 7.5 millimeter diameter mandrel.