Optical Frequency Combs Induced by Modulation Instability in Fiber Fabry-Pérot Resonators: Impact of the Pump Pulse Duration

Laser frequency combs, which consist of equidistant laser lines, have revolutionized time-keeping, metrology, and spectroscopy. In recent years, there has been progress in the development of optical frequency comb based on compact microresonators [1]. Fiber Fabry-Pérot resonators appeared as an interesting alternative of chip-scale microresonators combining their advantages with those of fiber ring cavities, namely, high quality factor, compact design, low energy consumption, and the capability to be easily implanted in fibered devices thanks to FC/PC connectors [2]. Interestingly, the nonlinear dynamics of these devices change compare to ring cavities due to the cross-phase modulation (XPM) effect between the temporal overlap of the forward and backward pulses.