Optical fiber characteristic measurement device and optical fiber characteristic measurement method

Abstract

An optical fiber characteristic measurement device () includes a light source () which emits laser light modulated at a prescribed modulation frequency, incident parts () which make the laser light, in the form of probe light (L) and pump light (L) incident on each of one end and the other end of an optical fiber (), a photodetection unit () which has a photoelectric conversion element, a current source, and an amplifier circuit and detects light emitted from the optical fiber (), a measurement unit () which measures characteristics of the optical fiber () using detection signals (D) output from the photodetection unit (), and a current-source control unit () which controls the current source on the basis of detection results of the photodetection unit () in a non-containing period that is a period during which the optical fiber () emits light which includes the probe light (L) and does not include Brillouin scattered light.