Bend Insensitive Fiber Optic Cables with Extended Lay Length
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Solution Overview
Problem
Fiber optic cables experience optical attenuation due to bending, which is exacerbated by small bend radii, limiting installation flexibility and manufacturing speed, especially when stranding is required to mitigate this issue.
Innovation Solution
The development of fiber optic cables with optical fibers that have a lay length of greater than or equal to 160 mm, either stranded or not, surrounded by strength material and an extruded polymer jacket, allowing each fiber to exhibit less than 0.6 dB bend-induced attenuation when wrapped around a 7.5 mm mandrel, thereby reducing optical loss while maintaining manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical fibers are stranded to reduce optical attenuation from bending, then bend performance is improved, but manufacturing speed is reduced
Solution Approach 1:
The patent changes the lay length parameter of the stranded optical fibers to be greater than or equal to 160 mm. This specific parameter modification allows the fibers to maintain bend performance while enabling faster manufacturing speeds, resolving the contradiction between reliability and productivity.
Solution Approach 2:
The patent applies partial stranding with a specific lay length requirement rather than complete stranding. By using partial stranding with controlled lay length (≥160 mm), the invention achieves sufficient bend performance without the full complexity and time cost of traditional stranding methods.
2Reliability
If stranding is performed to mitigate optical attenuation, then bend-induced attenuation is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent simplifies the stranding process by specifying a minimum lay length parameter (≥160 mm) rather than requiring complex multi-parameter control. This parameter-based approach reduces manufacturing complexity while still achieving the goal of reducing bend-induced optical attenuation.
3Ease of operation
If small bend radius is used in installation, then installation flexibility is improved, but optical attenuation increases
Solution Approach 1:
The patent modifies the optical fiber structure by implementing a lay length of ≥160 mm, which changes the fiber's mechanical-optical characteristics. This allows the fiber to tolerate smaller bend radii during installation without experiencing excessive optical attenuation, thus improving installation flexibility.
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
This solution enhances the bend performance of fiber optic cables, reducing optical attenuation and allowing for faster manufacturing by minimizing stranding, thus improving installation flexibility and reducing material costs.
Implementation Method 1
Individual optical fibers, which each act as a waveguide for directing light from one end of the fiber to the other
Implementation Method 2
Individual optical fibers, which each act as a waveguide for directing light from one end of the fiber to the other
Data Source
AI summary
Fiber optic cables and methods of manufacturing fiber optic cables are disclosed herein. According to one embodiment, a fiber optic cable includes a plurality of optical fibers. The fiber optic cable also includes strength material having a relatively long lay length, the strength material surrounding the plurality of optical fibers and a polymer jacket surrounding the strength material. Each of the optical fibers is configured to exhibit a bend-induced optical attenuation of less than or equal to about 0.5 dB when wrapped one turn around a 10 mm mandrel at a wavelength of 850 nanometers.