Optical communication underground equipment location mapping system and method

A method for optical communication underground facility position contrast, comprising the sequential steps of:

• acquiring, when an earthquake vibration is applied to an optical fiber laid underground, information of a change over time in a scattered light intensity distribution in a longitudinal direction of the optical fiber;
• measuring a change over time in a distortion response distribution in the longitudinal direction of the optical fiber based on the change over time in the scattered light intensity distribution in the longitudinal direction of the optical fiber;
• and
• estimating an underground facility state of the optical fiber based on the change over time in the distortion response distribution in a longitudinal direction of the optical fiber, and
• associating the underground facility position of the optical fiber with a longitudinal distance of the optical fiber.

An optical communication underground facility position contrast device, comprising:

• a scattered light intensity distribution acquisition unit for acquiring, when an earthquake vibration is applied to an optical fiber laid underground, information of a change over time in a scattered light intensity distribution in a longitudinal direction of the optical fiber;
• a distortion response distribution measurement unit for measuring a change over time in a distortion response distribution in the longitudinal direction of the optical fiber based on the change over time in the scattered light intensity distribution in the longitudinal direction of the optical fiber;
• and
• an underground facility position contrast unit for estimating an underground facility state of the optical fiber based on the change over time in the distortion response distribution in the longitudinal direction of the optical fiber, and associating the underground facility position of the optical fiber with a longitudinal distance of the optical fiber.