How do you repair a damaged fiber optics cables

First you have to locate the damaged location of the fiber optics cable. This can be done either by using a Visual Fault Locator (VFL) or an Optical Time Domain Reflectometer (OTDR). 

Based on the location of the fiber cable damage as indicated either or both VFL and OTDR you can decide on a what type of repair  required. 
The repair might required a fusion splicing between cables, a pigtail assembly, replacement of faulty adapters, macrobending in splicing tray or faulty patchcord due to rodents.