Waveform reconstruction device, waveform reconstruction system, and waveform reconstruction method

Abstract

Provided is a waveform reconstruction device capable of easily reconstructing an accurate time waveform of an optical signal without using an ultrafast time gate or a reference light source. A waveform reconstruction device () includes: a phase spectrum calculation unit () which (i) calculates a power spectrum of an output optical signal for each of a plurality of intensities of an input optical signal, when a phase spectrum of the input optical signal having the plurality of intensities is assumed to have a given phase spectrum, by simulating, using a parameter related to self-phase modulation of an optical fiber, propagation of the input optical signal through the optical fiber, and (ii) calculates, as the phase spectrum of the input optical signal, the given phase spectrum when a difference value between the calculated power spectrum and a measured power spectrum is equal to or less than a threshold value; and a waveform reconstruction unit () which reconstructs the time waveform of the input optical signal by performing frequency-time transform on the calculated phase spectrum and the power spectrum of the input optical signal.