Sensitivity of SHG-FROG for the Characterisation of Ultrahigh-Repetition-Rate Telecommunication Laser Sources

We analyze experimentally the sensitivity of second-harmonic generation frequencyresolved optical gating (SHG-FROG) for the complete intensity and phase characterization of both a sinusoidal beat signal and a train of 1.3 ps pulses at a repetition rate of 160GHz at 1550nm. Using a commercially-available optical spectrum analyzer in the SHG-FROG setup, incident pulses with energies of only 125fJ and 190fJ, which correspond to the beat signal and the 1.3ps pulse train, respectively, have been accurately characterized. Running head: SHG-FROG FOR ULTRAFAST TELECOMMUNICATIONS To whom correspondence should be addressed. E-mail: [email protected].