Method and apparatus for measuring an optical transfer characteristic

摘要

There is provided an optical transfer characteristic measuring method and apparatus capable of measuring an optical transfer characteristic of an optical device on optical frequency axis (optical wavelength axis) in wide optical frequency bandwidth with high resolution. Two light sources are provided one of which is a variable wavelength sweep type measurement light source 10 in which the wavelength of an optical signal generated thereby can be switched stepwise and also the optical frequency of the optical signal can be swept in a predetermined frequency range, and the other of which is a variable wavelength reference light source 20 in which the wavelength of an optical signal generated thereby can be switched stepwise, but the optical frequency of the optical signal cannot be swept. Optical signals having their wavelengths sequentially switched and set to corresponding specified wavelengths are sequentially generated from the variable wavelength sweep type measurement light source 10 and also a sweep of the optical frequency of each of the generated optical signals having the corresponding specified wavelengths is carried out over the predetermined frequency range, until the number of occurrence times of the optical signals reaches a preset number of times. After the measurement of the optical transfer characteristic has been completed, the measured results of the optical transfer characteristic regarding all of the specified wavelengths are concatenated on optical frequency axis (optical wavelength axis), and is analyzed/displayed. <IMAGE>