Optical Stranded Cable Filler Rods for Lateral Force Protection
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Solution Overview
Problem
Fiber optic cables with buffer tubes are prone to crushing under lateral forces, leading to micro-bends and breakage of optical fibers, which results in transmission errors and failures.
Innovation Solution
The cable core design features oversized filler rods that are diametrically opposite to each other, providing additional support and redirecting lateral forces away from the buffer tubes, thereby reducing the likelihood of crushing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filler rods are placed diametrically opposite to buffer tubes in the cable core, then the buffer tubes are protected from crushing under lateral forces, but the cable core structure becomes more complex
Solution Approach 1:
The patent introduces filler rods as intermediary elements positioned diametrically opposite to buffer tubes. These filler rods act as mediators that absorb and redistribute lateral forces, preventing direct crushing of the buffer tubes while maintaining cable structural integrity. The filler rods serve as a protective intermediary between the external lateral forces and the vulnerable optical fibers within the buffer tubes.
Solution Approach 2:
The patent employs an asymmetric arrangement where filler rods are positioned diametrically opposite to buffer tubes rather than following a uniform symmetric pattern. This asymmetric placement is specifically designed to counteract lateral forces at critical points where buffer tubes are most vulnerable, optimizing protection while managing structural complexity.
2Ease of operation
If the cable is subjected to lateral forces during installation, then the cable can be pulled into conduits and enclosures, but the buffer tubes and optical fibers are crushed and deformed
Solution Approach 1:
The patent implements beforehand cushioning by pre-positioning filler rods diametrically opposite to buffer tubes within the cable core. These filler rods are installed in advance during cable manufacturing and serve as pre-positioned protective elements that cushion against lateral forces during installation. The filler rods absorb the impact of lateral compression before it can reach and crush the buffer tubes and optical fibers, enabling flexible cable installation while preventing damage.
Data Source
AI summary
A cable includes a cable core including a central strength member. A plurality of buffer tubes, with each buffer tube including a plurality of optical fibers therein, and a plurality of filler rods are stranded about the central strength member. A characterizing feature is that a diameter of each of the plurality of filler rods is larger than a diameter of each of the plurality of buffer tubes. A jacket surrounds the cable core.