Patent ID: 8886037
Filing Date: 2014-11-11
Classification: G01J

Abstract:
1. A waveform reconstruction device which reconstructs a time waveform of an input optical signal, said waveform reconstruction device comprising: an input spectrum obtaining unit configured to obtain a power spectrum of the input optical signal; an output spectrum obtaining unit configured to obtain, as a measured power spectrum, a power spectrum for each of a plurality of intensities of the input optical signal, the power spectrum being obtained by measuring an output optical signal that is output after the input optical signal propagates through an optical fiber that induces self-phase modulation; a phase spectrum calculation unit configured to (i) calculate as a calculated power spectrum, for each of the plurality of intensities of the input optical signal, a power spectrum of the output 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 the propagation of the input optical signal through the optical fiber using a parameter related to the self-phase modulation of the optical fiber, and (ii) calculate as the phase spectrum of the input optical signal, the given phase spectrum when a difference value between the calculated power spectrum and the measured power spectrum is equal to or less than a threshold; and a waveform reconstruction unit configured to reconstruct a time waveform of the input optical signal by performing frequency-time transform on the phase spectrum calculated by said phase spectrum calculation unit and the power spectrum obtained by said input spectrum obtaining unit.