This dispersion measuring device 1A comprises a pulse forming section 3, a correlation optical system 4, a light detection unit 5, and a calculation unit 6. The pulse forming unit 3 forms, from a measured optical pulse Pa output from a pulse laser light source 2, an optical pulse train Pb including a plurality of optical pulses having different time lags and different center wavelengths. The correlation optical system 4 receives the optical pulse train Pb output from the pulse forming unit 3, and outputs correlated light Pc including the cross-correlation or autocorrelation of the optical pulse train Pb. The light detection unit 5 detects the time waveform of the correlated light Pc output from the correlation optical system 4. The calculation unit 6 estimates the chromatic dispersion amount of the pulse laser light source 2 on the basis of the characteristic amount of the time waveform of the correlated light Pc. Thus, a dispersion measuring device, a pulse light source, a dispersion measuring method, and a dispersion compensating method capable of measuring chromatic dispersion with a simple configuration are achieved.
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