Long-distance optical cable physical safety monitoring system

A long-distance optical cable physical safety monitoring system, comprising:

• a light source module, configured to output a light beam;
• a light interference module, connected to the light source module and configured to divide the light beam into multiple light beams;
• a sensing module, comprising a sensing optical cable and configured to transmit the multiple light beams;
• a reflection module, connected to the sensing module and configured to reflect the multiple light beams to make the light interference module to output an interference signal;
• a photoelectric conversion module, configured to convert the interference signal to obtain a data signal;
• and
• a data processing module, connected to the photoelectric conversion module and configured to process the data signal to monitor a disturbance at the sensing optical cable;
• wherein, the light interference module comprises a first coupler, a second coupler and a delay fiber, the delay fiber is between a first end of the first coupler and a first end of the second coupler, and a second end of the first coupler is connected to a second end of the second coupler.