Optical fiber backward Rayleigh scattered light waveform analysis method and optical fiber backward Rayleigh scattered light waveform analyzer

摘要

PROBLEM TO BE SOLVED: To provide a method for analyzing Rayleigh backscattering light waveform of an optical fiber and a device for analyzing the Rayleigh backscattering light waveform with which it is possible to measure the Rayleigh scattering light waveform of an optical fiber exceeding the limits of the coherence length of a light source and the dynamic range of an OFDR.SOLUTION: A method for analyzing Rayleigh backscattering light waveform of an optical fiber and a device for analyzing the Rayleigh backscattering light waveform according to the present invention are designed to measure a beat signal two or more times using an OFDR, analyze the optical frequency spectrum of Rayleigh scattered light intensity in a discretionary section of the optical fiber using each of a plurality of beat signals, and add up and average a plurality of obtained scattered intensity spectra.SELECTED DRAWING: Figure 1