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 cables is crucial for protecting and isolating the optical fibers from external stressors. Strength members typically consist of materials like aramid fibers or steel, which provide tensile strength to the cable. This prevents damage during installation, handling, or from environmental factors such as wind or ice loading. Buffer tubes are designed to surround the optical fibers and provide additional protection against physical stress, temperature changes, and moisture. Together, these components help maintain the integrity of the optical fibers, ensuring reliable performance over time in outdoor settings.

While waterproof coatings and fire retardants are important for protecting the cable from elements like water and flame, they do not directly provide structural protection to the fibers. Conductive rodent barriers protect against animal damage but do not specifically isolate or provide stress relief for the optical fibers themselves. Optical amplifiers and connectors serve different roles, primarily related to signal boosting and connectivity, rather than physical protection of the optical fibers.