Wavelength dispersion measurement apparatus and wavelength dispersion measurement method

A wavelength dispersion measurement apparatus for propagating a light pulse train including a first light pulse and a second light pulse having peak wavelengths different from each other through a sample, and measuring a wavelength dispersion of the sample based on a shape of an autocorrelation of a temporal waveform of the light pulse train after propagation or a shape of a cross-correlation between the temporal waveform of the light pulse train after propagation and a temporal waveform of a reference light pulse, the apparatus comprising:

• a light source configured to output a light pulse having a wavelength band;
• a light pulse train generation unit configured to generate and output, based on the light pulse output from the light source, a light pulse train including a first light pulse having a peak of a spectrum at a first wavelength within the wavelength band and a second light pulse having a peak of a spectrum at a second wavelength within the wavelength band;
• an optical amplifier configured to amplify and output the light pulse train output from the light pulse train generation unit;
• a spectrometer configured to measure a spectrum of the light pulse train output from the optical amplifier;
• and
• a control unit configured to control generation of the light pulse train by the light pulse train generation unit such that, in the spectrum measured by the spectrometer, a spectrum shape of the first light pulse is symmetric with respect to the first wavelength, and a spectrum shape of the second light pulse is symmetric with respect to the second wavelength.