Brillouin gain analyzer and brillouin gain analysis method

Abstract

An object of the present invention is to provide a Brillouin gain analysis device and a Brillouin gain analysis method capable of measuring a high-speed strain change of an optical fiber in a distributed manner. According to the present invention, a Brillouin gain analysis device 301 includes a laser 11 that outputs continuous light having a single frequency, a pulse generator 12 that pulses the continuous light from the laser and enters the pulsed light into one end of an optical fiber 50 to be measured, an ASE light source 13 that generates continuous light having a frequency component broader than the frequency of the continuous light output from the laser 11 and enters the generated continuous light into another end of the optical fiber 50, a modulator 14 that generates local light obtained by shifting the frequency of the continuous light from the laser 11 by any frequency, and a detector 15 that heterodyne-detects Brillouin scattered light generated by the optical fiber and the local light.

Dependencies are inferred from the claim text.