A device includes a memory and a processor coupled to the memory operable to perform operations. The operations include determining a first estimated distance associated with a first location of an optical fiber based on first light detected by a sensor, where the first light is detected at a first time when a portion of the optical fiber has a first configuration, and determining a second estimated distance associated with a second location of the optical fiber based on second light detected by the sensor, where the second light is detected at a second time when the portion of the optical fiber has a second configuration. The operations further include determining a third estimated distance associated with a third location of the optical fiber based on the first estimated distance and the second estimated distance, where the third location is associated with a fault in the optical fiber.