How can fiber optic cables be repaired?
Fiber optic cables are repaired in the same way that they are spliced. Unlike conventional copper wire, a cut fiber cable cannot simply be twisted or crimped back together. If the fiber isn’t cut but damaged, then the bad section is removed and the remaining fiber must be carefully spliced.
Two methods of splicing glass optical fiber cables are commonly used: Fusion splicing, which requires an expensive tool and proper training, and mechanical splicing, which involves the difficult task of aligning fiber cores and often results in higher-loss splices. In contrast, plastic optical fiber splicing is easier and more reliable, since the fiber is more tolerant to misalignment with its larger diameter core.
(21 June 2013) How To Repair The Accidentally Cut Fiber Optic Cables [Online]. Available: http://community.fs.com/blog/how-to-repair-the-accidentally-cut-fiber-optic-cables.html