Impact of pump pulse duration on modulation instability Kerr frequency combs in fiber Fabry-Prot resonators

We report an experimental investigation on the impact of the pump pulse duration on the modulation instability process in fiber Fabry-Perot resonators. We demonstrate that cross phase modulation between the forward and the backward waves alters significantly the modulation instability process. By varying the pump pulse duration, we show the modification of the modulation instability threshold and frequency. These experimental observations are in excellent agreement with theoretical predictions.(c) 2023 Optica Publishing Group