All-fibered high-quality 1.5–2 THz femtosecond pulse sources

Generation of high-quality ultra-high repetition rate optical pulse trains around 1.55 mum has become increasingly interesting for many scientific applications such as optical sampling, ultra-high capacity transmission systems, component testing or nonlinear phenomena studies. Unfortunately, the current bandwidth limitations of optoelectronic devices do not enable the direct generation of pulses with repetition rate higher than 80GHz and a temporal width below a few ps. Our method is based on the temporal reshaping of a sinusoidal beating into a high quality Gaussian pulse train by means of a multiple four wave mixing process taking place into a short segment (tens meters) of highly nonlinear optical fiber (HNLF) with length, dispersive and non-linear properties carefully chosen.