What are "buffer tubes" in fiber optic cables?

Buffer tubes in fiber optic cables serve as protective layers that encase groups of optical fibers. These tubes are essential for maintaining the integrity of the fibers inside, offering physical protection from external forces and environmental conditions. The buffer tubes ensure that the fibers are not unduly stressed, which could lead to microbending or macro bending, both of which can significantly impact signal quality and performance.

Additionally, buffer tubes help with organization and handling during installation and maintenance, making it easier to manage multiple fibers within a single cable. By providing a distinct separation, they also help in identifying individual fibers during splicing and termination.

The design of buffer tubes often includes materials that mitigate the risk of damage while allowing for some flexibility, which is crucial during cable routing and installation. This role of offering protective encasement clearly delineates the purpose of buffer tubes within the broader architecture of fiber optic cables.