To mitigate this problem, one approach is to only install fiber cables buried below the frost line, so there is no threat of ice. However, certain factors related to cold weather can still impact fiber optic cable performance and longevity. When the temperature dips below freezing, water freezes, and ice develops around the fiber. The fiber carries data as pulses of light, and has nowadays overtaken copper wire as the medium of choice – primarily because it is lower cost, faster and less bulky. There is. Broken a few fibers just trying to break out a buffer tube I never have to splice in the cold.