Optical line characteristic analyzing apparatus and optical line characteristic analyzing method

摘要

PROBLEM TO BE SOLVED: To provide an optical test system that measures optical fiber line characteristics only by using an outside existing facility without newly changing an optical device or an optical fiber line configuration, which is fast and highly sensitive, and the device configuration of which is easy even when a Brillouin frequency shift is different in the longitudinal direction of a branch optical fiber.SOLUTION: An optical fiber line characteristic analysis device according to the present invention comprises: an arithmetic processing device 23 for detecting a time difference in incidence into an optical fiber line of a first test light pulse and a second test light pulse using a digital signal, calculating a Brillouin gain using the optical intensity of the first test light pulse out of returned lights reflected at the optical fiber line, repeatedly changing the time difference and calculating a Brillouin gain for each changed time difference, and acquiring the loss distribution of the optical fiber line using the Brillouin gain calculated by repeatedly changing the time difference.SELECTED DRAWING: Figure 1