Optical fiber fault detection system and optical fiber fault detection method

The invention discloses an optical fiber fault detection system and an optical fiber fault detection method, which are applied to the field of optical communication. The optical fiber fault detection system comprises a light source, a first light control module, a photoelectric detection module and a processing module, the light source is used for outputting a first pulse light signal to the first light control module; the first light control module is used for outputting the first pulse light signal to the optical fiber, receiving a reflected light signal returned from the optical fiber and outputting the reflected light signal to the photoelectric detection module; the photoelectric detection module is used for converting the reflected light signal into an electric signal and outputting the electric signal to the processing module; the processing module is used for identifying a signal area in the electric signal; performing bandwidth compensation on the signal in the signal area; and carrying out fault eve