Optical fiber characteristic measurement device and optical fiber characteristic measurement method

Abstract

An optical fiber characteristic measurement device (1) includes: a first optical splitter (12) that splits frequency-modulated modulated light (L1) into pump light (LP) and reference light (LR); a second optical splitter (16) that causes the pump light to be incident from one end of an optical fiber under test (FUT) and outputs Brillouin scattered light (LS) generated inside the optical fiber under test; a first detector (19) that detects interference light between the Brillouin scattered light output from the second optical splitter and the reference light; an analyzer (20) that obtains a Brillouin gain spectrum which is a spectrum of the Brillouin scattered light from a detection signal (S1) output from the first detector; a second detector (22, 31) that detects a double wave component having a frequency that is double a modulation frequency of the modulated light included in an intensity component of each frequency of the Brillouin gain spectrum obtained by the analyzer; and a measurer (23) that measures characteristics of the optical fiber under test on the basis of the double wave component detected by the second detector.

Dependencies are inferred from the claim text.