Optical communication underground equipment location mapping system and method

1 . An optical communication underground facility position contrast system, comprising:

a scattered light intensity distribution measurement device for measuring, when an earthquake vibration is applied to an optical fiber laid underground, a change over time in a scattered light intensity distribution in a longitudinal direction of the optical fiber; and

an underground facility position contrast device 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, 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.

2 . The optical communication underground facility position contrast system according to claim 1 , wherein

the underground facility position contrast device measures a change over time in a vibration frequency 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, estimates an underground facility state of the optical fiber based on whether the change over time in the vibration frequency distribution in the longitudinal direction of the optical fiber is continuous or discontinuous on a longitudinal distance of the optical fiber, and associates the underground facility position of the optical fiber with the longitudinal distance of the optical fiber.

3 . The optical communication underground facility position contrast system according to claim 1 , wherein

the underground facility position contrast device measures a change over time in a vibration frequency 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, estimates an underground facility state of the optical fiber based on whether the change over time in the vibration frequency distribution in the longitudinal direction of the optical fiber coincides with or differs from the change over time in the vibration frequency of the earthquake vibration, and associates the underground facility position of the optical fiber with the longitudinal distance of the optical fiber.

4 . The optical communication underground facility position contrast system according to claim 1 , wherein the underground facility position contrast device measures a change over time in a distortion amplitude 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, estimates an underground facility state of the optical fiber based on whether the change over time in the distortion amplitude distribution in the longitudinal direction of the optical fiber is continuous or discontinuous on a longitudinal distance of the optical fiber, and associates the underground facility position of the optical fiber with the longitudinal distance of the optical fiber.

5 . 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.

6 . 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.