What is used in outside plant fiber-optic cable to protect and isolate the optical fibers from stress?

The use of strength members and buffer tubes in outside plant fiber-optic cable is crucial for protecting and isolating the optical fibers from stress. Strength members, which are often made from materials like aramid fibers or steel, provide the necessary tensile strength to withstand pulling and bending forces during installation and throughout the operational life of the cable. This ensures that the delicate optical fibers are not subjected to harmful stress that could lead to damage or signal loss.

Buffer tubes are protective structures that encase the individual optical fibers. They help to reduce the risk of microbending and macrobending, which can occur due to external pressure or stress on the cable. By providing a cushioning layer, buffer tubes allow the fibers to remain stable and secure, further preventing any potential degradation of the signal quality.

Overall, the combination of strength members and buffer tubes is designed specifically to maintain the integrity of the optical fibers and ensure their reliable performance in various environmental conditions.