PROBLEM TO BE SOLVED: To reduce costs associated with measurement and setup work of a measurement system by reducing the number of devices to be used separately other than an optical spectrum analyzer when performing measurement including characteristics in the time axis direction for pulse-modulated light as a measurement target. Make it easy. By controlling the basic components of an optical spectrum analyzer and adding new functions, it is possible to measure the characteristics of pulse-modulated light in the time axis direction by the optical spectrum analyzer alone. The diffraction grating position of the optical tunable wavelength filter is adjusted to select the 0th-order diffracted light, and the processing S01 for all wavelength bands is performed. Further, the sampling timing tx is determined in the spectrum measurement process S02 based on the pulse-on time Ton and the pulse period Tp of the pulse-modulated light detected from the waveform, and the spectrum is measured. The waveform in the time axis direction and the spectral waveform in the frequency axis direction are displayed simultaneously on the same screen. [Selection diagram] Fig. 2
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