Optical fiber chromatic dispersion distribution measuring apparatus and measuring method

摘要: An optical fiber chromatic dispersion distribution measuring apparatus for measuring the dispersion distribution of an under test comprising two light sources 1, 2 at least one which can change wavelength thereof, wherein light beams having different wavelengths from each other and emitted from two are inputted to 7 to measure a four-wave mixing beam generated by interaction between time domain reflectometer (OTDR) 9; wherein bandpass filter 8 fixed center wavelength is provided previous stage time domain (OTDR); coherence controller 10 controlling coherence the light outputted 2.