Optical frequency combs generation in fiber Fabry-Pérot resonators

Optical frequency combs, which consist of equidistant laser lines, have revolutionized time-keeping, metrology, and spectroscopy. In recent years, there has been significant progress in the development of optical frequency comb based on compact microresonators. Fiber Fabry-Pérot resonators have emerged as an interesting alternative of chip-scale microresonators combining their advantages with those of fiber ring cavities, namely, high quality factor, compact design, and easy integration in fiber systems thanks to FC/PC connectors.

Our investigations demonstrate that the generated frequency combs with these devices, whether in the anomalous dispersion regime through cavity soliton generation, or in the normal dispersion regime via platicon generation, are comparable to those produced by microresonators, and thus are well-suited for applications in fiber systems. Furthermore, the two-way light circulation in Fabry-Pérot cavities offers rich and novel nonlinear dynamics. In particular, we have examined the impact of pump pulse duration on the nonlinear Fabry-Pérot dynamics, and have unveiled a new nonlinear mechanism that enables the generation of phase-locked stable Brillouin Kerr frequency combs. Finally, we aim to leverage various optical fiber designs to create a multiple frequency comb light source using multimode and multicore fibers.