Electrooptic spectral shearing interferometry using a Mach-Zehnder modulator with a bias voltage sweeper

We propose a novel implementation of electrooptic spectral shearing interferometry (EOSSI) for complete characterization of optical pulses. We measure the spectrum of the output pulse of a Mach-Zehnder intensity modulator by sweeping the bias voltage. By doing this, we can synthesize a spectral fringe, with which we can reconstruct the waveform of the pulse under test. Compared to the previous EOSSI, our proposal simplifies the setup and enables us to measure high-repetition rate trains of optical pulses. In the experiment, we characterize picosecond optical pulse trains at a repetition rate of 10 GHz with high sensitivity and reliability.